Diagram sections — 18 (84 total)
AIR CONDITIONING ANTI-LOCK BRAKES COMPUTER DATA LINES COOLING FAN CRUISE CONTROL ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS POWER DISTRIBUTION SHIFT INTERLOCKS STARTING/CHARGING TRANSMISSION WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING
4.3L 4.3L (VIN W), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 30 (engine harn, 23 cm from breakout to maf sensor) (engine harness, near bulkhead grommet) (engine harness, near maf sensor) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (engine bulkhead relay bracket) A/c compressor high pressure cutoff switch (rear of compressor) A/c compressor refrigerant pressure switch (a/c accumulator) A/c compressor refrigerant pressure switch (rear of compressor) A/c enable A/c ground A/c request Diode Eng-bat fuse 15a G112 (rear of left cylinder head) G200 (left interior bulkhead) Gauges fuse 20a Hot at all times Hot in run or start I/p fuse box Pnk R100 (engine harness, 30 cm from break-out to maf S110 S125 (engine harness, 13 cm from a/c high pressure switch breakout) S132 (engine harness, near maf sensor) S142 S143 S144 (engine harness, near bulkhead grommet) Sensor) Vehicle control module (left radiator support)
5.7L 5.7L (VIN R), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 30 (engine harn, 23 cm from breakout to maf sensor) (engine harness, near bulkhead grommet) (engine harness, near maf sensor) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (engine bulkhead relay bracket) A/c compressor high pressure cutoff switch (rear of compressor) A/c compressor refrigerant pressure switch (a/c accumulator) A/c compressor refrigerant pressure switch (rear of compressor) A/c enable A/c ground A/c request Diode Eng-bat fuse 15a G112 (rear of left cylinder head) G200 (left interior bulkhead) Gauges fuse 20a Hot at all times Hot in run or start I/p fuse box Pnk R100 (engine harness, 30 cm from break-out to maf S110 S125 (engine harness, 13 cm from a/c high pressure switch breakout) S132 (engine harness, near maf sensor) S142 S143 S144 (engine harness, near bulkhead grommet) Sensor) Vehicle control module (left radiator support)
6.5L 6.5L (VIN F), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 27 (body builder installed) (engine harn, 20 cm from cruise control module) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (right side of driver's island) A/c compressor high pressure cutoff switch (in high pressure line) A/c compressor refrigerant pressure switch (rear of compressor) A/c enable A/c request Diode Eng-bat fuse 15a G206 (below driver's island) Gauges fuse 20a Hot at all times Hot in run or start I/p fuse box Pnk Powertrain control module (left side of driver's island) R100 (engine harness, 30 cm from break-out to maf S115 (engine harness, near bulkhead grommet) S122 (engine harness, 15 cm from a/c compressor S123 (engine harness, 15 cm from a/c compressor clutch) S126 S140 S141 (i/p harness, near bulkhead grommet) S203 (i/p harness, near bulkhead grommet) Sensor) 6.5L (VIN Y), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 14 (engine harness, 4 cm from electronic brake control module) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (engine bulkhead relay bracket) A/c compressor high pressure cutoff switch (rear of compressor) A/c compressor refrigerant pressure switch (rear of compressor) Diode Eng-bat fuse 15a G200 (left interior bulkhead) Hot at all times I/p fuse box S110 S125 (engine harness, 13 cm from a/c high pressure switch breakout) S144 (engine harness, near bulkhead grommet)
7.4L 7.4L (VIN J), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 28 (body builder installed) (engine harn, 20 cm from cruise control module) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (right side of driver's island) A/c compressor high pressure cutoff switch (rear of compressor) A/c compressor refrigerant pressure switch (a/c accumulator) A/c enable A/c ground A/c request Diode Eng-bat fuse 15a G206 (below driver's island) Gauges fuse 20a Hot at all times Hot in run or start I/p fuse box Pnk R100 (engine harness, 30 cm from break-out to maf S115 (engine harness, near bulkhead grommet) S122 (engine harness, 15 cm from a/c compressor S123 (engine harness, 15 cm from a/c compressor clutch) S126 S140 S141 (i/p harness, near bulkhead grommet) S203 (i/p harness, near bulkhead grommet) Sensor) Vehicle control module (left radiator support) 7.4L (VIN N), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Air Conditioning Wiring Diagrams for Chevrolet Forward Control P30 1997: 15 (engine harness, 15 cm from compressor clutch) (i/p harness, 41 cm from bulkhead grommet) (provisions for body builder hvac system) A/c compressor clutch A/c compressor clutch relay (right side of driver's island) A/c compressor high pressure cutoff switch (rear of compressor) A/c compressor refrigerant pressure switch (rear of compressor) Diode Eng-bat fuse 15a G206 (below driver's island) Hot at all times I/p fuse box S122 S123 (engine harness, 15 cm from a/c compressor clutch) S203
ANTI-LOCK BRAKES Anti-lock Brake Wiring Diagrams, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Anti-lock Brake Wiring Diagrams, Commercial Chassis for Chevrolet Forward Control P30 1997: 54 (ebcm harn, near right side of radiator) (i/p harn, above steering column) (i/p harn, left side of bulkhead) (left frame rail) (left side of i/p) data link connector (rear of left cylinder head) Abs ind Abs lamp control Battery junction block Brake diode d101 (underhood fuse-relay center) Brake ind Brake lamp control Brake pressure differential switch Brake sw input Brake sw output C1 tcc/ stoplamp switch Diesel Ebcm ground Electronic brake control module (below radiator of first crossmember) G100 G114 Gasoline Gauges fuse 20a Hot at all times Hot in run Hot in run or start I-3 fuse 15a I/p fuse block Ign Instrument cluster Left front wheel speed sensor Lft frt sensor (+) Lft frt sensor (-) Pnk Pump motor ground Pump motor power Red Right front wheel speed sensor Rt frt sensor (+) Rt frt sensor (-) S150 S160 S161 S162 S200 S207 S214 (i/p harn, 10 cm from before i/p fuse block breakout) Serial data line Serial data signal Tan Vehicle control module (left side of engine compt) Vehicle speed sig Vss buffer (left side of interior bulkhead) Vss sig Anti-lock Brake Wiring Diagrams, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Anti-lock Brake Wiring Diagrams, Motor Home Chassis for Chevrolet Forward Control P30 1997: 51 (30 cm from abs harn breakout) (abs harn, near breakout to abs ground) (i/p harn, above steering column) (i/p harn, left side of bulkhead) (left side of i/p) data link connector (near breakout to ignition coil) 7.4 l vin j Abs ind Abs lamp control Battery junction block Brake diode d101 (underhood fuse-relay center) Brake ind Brake lamp control Brake pressure differential switch Brake sw input Ebcm ground Electronic brake control module (below radiator of first crossmember) Except 7.4 l vin j Gauges fuse 20a Hot at all times Hot in run Hot in run or start I-3 fuse 15a I/p fuse block Ign Instrument cluster Left front wheel speed sensor Lft frt sensor (+) Lft frt sensor (-) Pnk Pump motor ground Pump motor power Red Right front wheel speed sensor Rt frt sensor (+) Rt frt sensor (-) S149 (i/p harn, left side of bulkhead) S150 S154 S160 S166 S167 S200 Serial data line Serial data signal Tan Tcc/ stoplamp switch Vehicle control module (left side of engine compt) Vehicle speed sig Vss buffer (left side of interior bulkhead) Vss sig
COMPUTER DATA LINES Computer Data Lines, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Computer Data Lines, Commercial Chassis for Chevrolet Forward Control P30 1997: 23 (left interior bulkhead) (on rear of left cylinder head) (thermostat housing) B10 Data clss 2 Data link connector (left side of interior bulkhead, on right side of relay bracket) Diesel Electronic brake control module (below radiator) Eng bat fuse 15a G110 G114 G202 Gasoline Hot at all times I/p fuse block S110 S143 S144 S150 (i/p harness, approx 17 cm from breakout to steering column connector) Serial data Tan Transmission control module (diesel a/t only) (left interior bulkhead, on top of relay bracket) Vehicle control module (gasoline only) (left radiator support) Computer Data Lines, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Computer Data Lines, Motor Home Chassis for Chevrolet Forward Control P30 1997: 25 6.5l 6.5l vin f 7.4l vin j 7.4l vin j & 6.5l vin f only A14 Data clss 2 Data link connector (left side support bracket of steering column) Diag enable Diag sig Electronic brake control module (abs crossmember) Eng bat fuse 15a G112 (20 cm from left glow plug harness breakout) G120 (10 cm from alternator harness breakout) G202 (left side of i/p) Hot at all times I/p fuse block Powertrain control module (6.5l vin f only) (left side of driver's island) Powertrain control module (7.4l vin n only) (left side of driver's island) S126 S141 S202 (i/p harness, 15 cm from breakout for abs harness) S203 Serial data Tan Vehicle control module (7.4l vin j only) (top of radiator support)
COOLING FAN
6.5L 6.5L (VIN F), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997: 14 (i/p harness, 41 cm from bulkhead grommet) Auxiliary engine coolant fan Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line) Auxiliary engine coolant fan relay (main support bracket, behind steering column) Auxiliary fan control switch (on right side of cylinder head) Eng 1 fuse 20a G200 (left interior bulkhead) Hot at all times Hot in run I/p fuse box Pnk Red S128 (engine harness, 12 cm from glowplug control (6.5l vin f) or 30 cm from cruise module breakout (7.4l vin n)) S203 6.5L (VIN Y), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997: 12 Auxiliary engine coolant fan Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line) Auxiliary engine coolant fan relay (engine bulkhead relay bracket, under battery junction block) Eng 1 fuse 20a G200 (left interior bulkhead) Hot at all times Hot in run I/p fuse box Pnk Red S110 (engine harness, 4 cm from electronic brake control module) S116 (engine harness, 5 cm from right glow plug breakout)
7.4L 7.4L (VIN J), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997: 14 (i/p harness, 41 cm from bulkhead grommet) Auxiliary engine coolant fan Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line) Auxiliary engine coolant fan relay (main support bracket, behind steering column) Eng 1 fuse 20a G200 (left interior bulkhead) Hot at all times Hot in run I/p fuse box Pnk Red S128 (engine harness, 12 cm from egr breakout) S203 Vehicle control module (top of radiator support) 7.4L (VIN N), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Cooling Fan Wiring Diagram for Chevrolet Forward Control P30 1997: 14 (i/p harness, 41 cm from bulkhead grommet) Auxiliary engine coolant fan Auxiliary engine coolant fan a/c pressure switch (in a/c high pressure line) Auxiliary engine coolant fan relay (main support bracket, behind steering column) Auxiliary fan control switch (on right side of cylinder head) Eng 1 fuse 20a G200 (left interior bulkhead) Hot at all times Hot in run I/p fuse box Pnk Red S128 (engine harness, 12 cm from glowplug control (6.5l vin f) or 30 cm from cruise module breakout (7.4l vin n)) S203
CRUISE CONTROL
6.5L 6.5L (VIN F), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 30 (engine harn, 16 cm from bulkhead grommet) (i/p harness, 8 cm from breakout for steering column) A11 B10 B11 Cruise on input D10 Disengage input Hazard lamps flasher Hot at all times Hot in run I-3 fuse 9 15a I/p fuse block Multifunction lever Nca Off Powertrain control module (pcm) (left side of driver's island) R/a Resume/accel input S/c S116 S124 S200 Set/coast input Stop/haz fuse 11 15a Stoplamp switch (top of brake pedal) Torque converter clutch and stoplamps switch (right side of steering column upper support) Vehicle speed sensor buffer (above accelerator pedal) Vss hi Vss lo
7.4L 7.4L (VIN J), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 34 (engine harn, 11 cm from breakout to cruise module) (engine harn, 45 cm from breakout for map sensor) (rear of transmission) 4000 pulses/mile Cruise control module (radiator support bracket) Cruise control switch Cruise on input Cruise status Disengage input Ground Hazard lamps flasher Hot at all times Hot in run I-3 fuse 9 15a I/p fuse block Ignition Nca Off R/a Resume/accel input S/c S116 S124 S126 S200 Set/coast input Stop/haz fuse 11 15a Stoplamp switch (top of brake pedal) Torque converter clutch and stoplamps switch (right side of steering column upper support) Vehicle control module (vcm) (top of radiator support) Vehicle speed input Vehicle speed sensor (vss) Vss return Vss signal 7.4L (VIN N), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Cruise Control Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 29 (engine harn, 4 cm from cruise module breakout) (i/p harn, 22 cm from bulkhead grommet) 4000 pulses/mile Cruise control module (radiator support bracket) Cruise control switch Cruise on input Disengage input Ground Hazard lamps flasher Hot at all times Hot in run I-3 fuse 15a I/p fuse block Ignition Nca Off R/a Resume/accel input S/c S116 S124 S126 S200 Set/coast input Stop/haz fuse 15a Stoplamp switch (top of brake pedal) Torque converter clutch and stoplamps switch (top of brake pedal) Vehicle speed input Vehicle speed sensor buffer (above accelerator pedal)
ENGINE PERFORMANCE
4.3L 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 62 (thermostat housing) g125 1-2 shift sol ctrl 2-3 shift sol ctrl 3x ckp sens sig A pnk A/c cmp cltch rly out A/c compressor clutch relay (engine bulkhead relay bracket, under battery junction block) Cam posit sens rtn Cam posit sens sig Camshaft position (cmp) sensor (in distributor) Ckp sens rtn Crankshaft position (ckp) sensor (right front of engine at crankshaft balancer pulley) Ect sensor input Egr posit input Evap can purge ctrl Evaporative emissions (evap) canister purge solenoid valve (right center of intake manifold) Feed ign a pnk Fuel inj no.1 ctrl Fuel inj no.2 ctrl Fuel inj no.3 ctrl Fuel inj no.4 ctrl Fuel inj no.5 ctrl Fuel inj no.6 ctrl G125 (thermostat housing) Hall effect sensor Heated oxygen sensor (ho2s) left pre-convertor (left exhaust pipe ahead of catalytic converter) Ho2s bnk1 sens1 gnd Ho2s bnk1 sens1 sig Ho2s bnk2 sens1 gnd Ho2s bnk2 sens1 sig Ho2s post sens2 gnd Ho2s post sens2 sig Iat sens sig Idle air control (iac) valve (left side of air intake system) Idle air ctrl (a-low) Idle air ctrl (b-low) Idle air ctrl (iac) a-hi Idle air ctrl (iac) b-hi Knock sens sig Knock sensor (ks) (rear of engine, top center) Map sensor input Mass air flow input Nca Pnk Pnk c Pnk d Power S110 S138 S140 S143 Sens gnd System ground Tan Tcc pwm sol ctrl Tft sig Throttle position sens Vehicle control module (vcm) (vcm bracket bolted to left radiator support) Vehicle speed sensor (vss) (left rear of transmission, near center) Vss rtn Vss sig Whl spd sig, left frt 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 34 (front left top of intake manifold) linear exhaust gas recirculation (egr) valve (rear of left cylinder head) g114 1-2 shift solenoid 2-3 shift solenoid Automatic transmission (a/t) (if equipped) (rear of engine) Ecm-i fuse 20a Eng 1 fuse 20a Fuel injector no.1 Fuel injector no.2 Fuel injector no.3 Fuel injector no.4 Fuel injector no.5 Fuel injector no.6 Heated oxygen sensor (h02s) post convertor (exhaust pipe behind catalytic converter) Heated oxygen sensor (ho2s) right pre-convertor (right exhaust pipe ahead of catalytic converter) Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Nca Note: (fuel injectors are located in central port injection, central sfi, in center of intake manifold, at fuel meter body) Pnk Pnk d Pnk n Pressure control solenoid (pcs) Red p S108 S116 S118 Tan Tan a Tcc pwm solenoid Trans fuse 10a Transmission fluid temperature (tft) sensor (internal) Transmission range (tr) pressure switch assembly W/ a/t only 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 46 (eng harn, approx 13cm from tps breakout) s137 (eng harn, approx 8cm from ect sensor breakout) (eng harn, approx 8cm from tps breakout) s136 (tail & stop lamps extension harness at crossmember in front of fuel tank) g415 5v ref A/c compressor high pressure cut-off switch (rear of a/c compressor) Eng bat fuse 15a Engine coolant temperature (ect) sensor (front of intake manifold near thermostat housing) Fuel gauge Fuel pump switch & engine oil pressure gauge sensor (top left rear of engine) Fuel sender & fuel pump (top of fuel tank) G114 (rear of left cylinder head) G125 (thermostat housing) G202 (left interior bulkhead near relay bracket) (body builder installed) Gauges fuse 20a Ground distribution system Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Instrument cluster Intake air temperature (iat) sensor (engine air induction system elbow near remote air cleaner) Manifold absolute pressure (map) sensor (intake manifold, rear center) Map Mass air flow sensor (maf) (air intake system between air cleaner & engine) Nca Oil press gauge Pnk R100 (1100 ohms .75 watts) Red Ref lo S118 S118 (m/t) S119 (eng harn, approx 11cm from ect sensor breakout) S135 S141 S142 (eng harn, approx 23cm from maf sensor breakout) S143 S143 (a/t) S144 S207 Service engine soon indicator Speedo meter Tan Tan a Temp Throttle position (tp) sensor (intake system, left side) 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 69 (engine harness, taped to ignition coil breakout) (i/p side of eng harn, approx 19cm from left bulkhead grommet toward ignition sw) (left interior bulkhead near relay bracket) (body builder installed) g202 (rear of left cylinder head) g114 (thermostat housing) g125 5v ref 5v return 87a A/c request sig A/t A/t input speed sensor (transmission, left front) Anti-lock brake system Brake sig Clutch pedal position switch (left side of brake pedal bracket) Clutch sig Cylinder no.1 Cylinder no.2 Cylinder no.3 Cylinder no.4 Cylinder no.5 Cylinder no.6 Data link connector (dlc) (partial) (left interior bulkhead on right side of relay bracket) Distributor (top rear of engine) Ecm-bat fuse 20a Electronic ignition (ei) coil driver module (bracket at top edge of right cylinder head) Feed ignition Fuel pump prime connector (taped to fuel pump relay breakout) Fuel pump relay (engine bulkhead relay bracket under battery junction block) Fuel pump rly ctrl G125 (thermostat housing) Ground High voltage coil wire Hot at all times Hot in (on) run I-3 fuse 15a I/p fuse block (dash panel provided by body builder) (body builder installed) Ign feed Ignition coil (bracket at top edge of right cylinder head) Input spd sens rtn Input spd sens sig M/t M/t only Mil ctrl Pcs sol (hi) Pcs sol (lo) Pnk Pnk a Range sig "a" Range sig "b" Range sig "c" Red Return control timing S110 S133 S134 S138 S143 S200 Serial data Service circuit power Shift interlock system Signal control timing Spark plugs System ground Tachometer (provision for) a Timing ctrl sig Torque convertor clutch (tcc) & stop lamps switch (right side of steering column upper support) Vehicle control module (vcm) (vcm bracket bolted to left radiator support) Vss output
5.7L 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 68 1-2 shift sol ctrl 2-3 shift sol ctrl 4x ckp sens sig A pnk A/c cmp cltch rly out A/c compressor clutch relay (engine bulkhead relay bracket, under battery junction block) C pnk Cam posit sens rtn Cam posit sens sig Camshaft position (cmp) sensor (in distributor) Ckp sens rtn Ckp sensor return Ckp sensor signal Crankshaft position sensor (ckp) (right front of engine at crankshaft balancer pulley) Ect sensor in Egr posit in Evap can purge ctrl Evaporative emissions (evap) canister purge solenoid valve (right center of intake manifold) Fuel inj no.1 ctrl Fuel inj no.2 ctrl Fuel inj no.3 ctrl Fuel inj no.4 ctrl Fuel inj no.5 ctrl Fuel inj no.6 ctrl Fuel inj no.7 ctrl Fuel inj no.8 ctrl G125 (thermostat housing) Hall effect sensor Heated oxygen sensor (ho2s) left pre-convertor (left exhaust pipe ahead of catalytic converter) Heated oxygen sensor (ho2s) right pre-convertor (right exhaust pipe ahead of catalytic converter) Ho2s bnk1 sens1 gnd Ho2s bnk1 sens1 sig Ho2s bnk1 sens2 gnd Ho2s bnk1 sens2 sig Ho2s bnk2 sens1 gnd Ho2s bnk2 sens1 sig Ho2s bnk2 sens2 gnd Ho2s bnk2 sens2 sig Iat sens sig Idle air control (iac) valve (left side of air intake system) Idle air ctrl (a-low) Idle air ctrl (b-low) Idle air ctrl (iac) a-hi Idle air ctrl (iac) b-hi Ign feed Knock sens sig Knock sensor (ks) (engine block, lower right side in front of starter) Map sensor in Mass air flow in Nca Pnk Pnk d Pnk pnk Power S138 S139 S140 Sens gnd Tan Tan a Tcc pwm sol ctrl Tft sig Throttle posit sens Vcm ground Vehicle control module (vcm) (vcm bracket bolted to left radiator support) Vehicle speed sensor (vss) (left rear of transmission, near center) Vss rtn Vss sig 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 35 (rear of left cylinder head) g114 1-2 shift solenoid 2-3 shift solenoid Automatic transmission (a/t) (if equipped) (rear of engine) Ecm-1 fuse 20a Eng 1 fuse 20a Fuel injector no.1 Fuel injector no.2 Fuel injector no.3 Fuel injector no.4 Fuel injector no.5 Fuel injector no.6 Fuel injector no.7 Fuel injector no.8 Heated oxygen sensor (ho2s) left post convertor (left exhaust pipe behind catalytic converter) Heated oxygen sensor (ho2s) right post convertor (right exhaust pipe behind catalytic converter) Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Linear exhaust gas recirculation (egr) solenoid valve (front left top of intake manifold) Nca Note: fuel injectors are located in central port injection, center of intake manifold (fuel meter body) Pnk Pnk d Pnk n Pnk pnk pnk pnk Pressure control solenoid (pcs) Red p S108 S116 S118 Tan Tan a Tcc pwm solenoid Transmission fluid temperature (tft) sensor (internal) Transmission range (tr) pressure switch assembly 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 47 (eng harn, approx 30cm from maf sensor breakout) (eng harn, approx 8cm from ect sensor breakout) s135 (engine harn, approx 8cm from tp sensor breakout) (tail & stop lamps extension harness at crossmember in front of fuel tank) g415 5v ref A/c compressor high pressure cut-off switch (rear of a/c compressor) Eng-bat fuse 15a Engine coolant temperature (ect) sensor (front of intake manifold, near thermostat housing) Fuel gauge Fuel pump switch & engine oil pressure gauge sensor (top left rear of engine) Fuel sender & fuel pump (top of fuel tank) G114 (rear of left cylinder head) G125 (thermostat housing) G202 (left interior bulkhead near relay bracket) (body builder installed) Gauges fuse 20a Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Instrument cluster Intake air temperature (iat) sensor (engine air induction system elbow near remote air cleaner) Manifold absolute pressure (map) sensor (intake manifold, rear center) Map Mass air flow (maf) sensor (air intake system between air cleaner & engine) Nca Oil press gauge Pnk R100 (1100 ohms .75 watts) Red Ref lo S118 (m/t) S119 (eng harn, approx 4cm from ect sensor breakout) S136 S137 (eng harn, approx 12cm from tp sensor breakout) S141 (eng harn, approx 30cm from maf sensor breakout) S142 S143 S143 (a/t) S144 S205 S207 Service engine soon indicator Speedo meter Tan Tan a Temp Throttle position (tp) sensor (intake system, left side) Trans fuse 10a 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 73 (engine harness, taped to ignition coil breakout) (left interior (left interior bulkhead near relay bracket) (body builder installed) g202 (rear of left cylinder head) g114 5v ref 5v rtn 87a A/c request sig A/t A/t input speed sensor (transmission, left front) Anti- lock brakes system Brake sig Bulkhead on right side of relay bracket) Clutch pedal position switch (left side of brake pedal bracket) Clutch sig Cylinder no.1 Cylinder no.2 Cylinder no.3 Cylinder no.4 Cylinder no.5 Cylinder no.6 Cylinder no.7 Cylinder no.8 Data link connector (dlc) Distributor (top rear of engine) Ecm-bat fuse 20a Electronic ignition coil driver module (bracket at top edge of right cylinder head) Evap can purge sw sig Evaporative emmissions (evap) canister purge vacuum diagnostic switch (right front of engine above valve cover) Fuel pump a prime connector (taped to fuel pump relay breakout) Fuel pump relay (engine bulkhead relay bracket under battery junction block) Fuel pump rly ctrl G125 (thermostat housing) Gnd Ground High voltage coil wire Hot at all times Hot in (on) run I-3 fuse 15a I/p fuse block (dash panel provided by body builder) (body builder installed) Ign feed Ignition coil (bracket at top edge of right cylinder head) Ignition feed Input spd sens rtn Input spd sens sig M/t Mil ctrl Pcs sol (hi) Pcs sol (lo) Pnk Pnk a Range sig "a" Range sig "b" Range sig "c" Red S110 S133 S134 S138 S143 S200 (i/p side of eng harn, approx 19cm from left bulkhead grommet) Serial data Service circuit power Shift interlock system Spark plugs System gnd Tachometer (provision for) a Timing control return Timing control signal Timing ctrl sig Torque convertor clutch (tcc) & stop lamps switch (right side of steering column upper support) Vehicle control module (vcm) (vcm bracket bolted to left radiator support) Vss output
6.5L 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 96 (18 cm from breakout for left glow plugs) g112 (eng harn, 16cm from battery jb stud d) (eng harn, 21cm from left bulkhead grommet) 12v 3-2 shift sol 5 vref 5v ref volt A/c request sig A10 A11 3 mode cruise a12 B10 B11 B12 Brake sw in Brake switch input C10 C11 C12 C13 C14 C15 C16 Cam posit sens sig rtn Camshaft posit sens Closure gnd Coolant temperature sensor (lower left front of engine block) Cruise ctrl sw engage Cruise eng sw retard D10 D11 D12 D13 D14 D15 D16 Ect temp sens in Engine crank sens input Engine crank sensor (inside electronic injection pump) Force motor Force mtr hi Force mtr low Fuel pump input Fuel pump rly ctrl Fuel sol closure (5v sig) Fuel temp sens (5v sig) Glow plug "wait" lp out Glow plug relay Ground Heavy duty electronic 4-spd automatic overdrive transmission Intake man air temp sens Intake manifold air temperature sensor (at front of engine) Manifold absolute pressure sensor (on bulkhead, right of steering column) Map sens input On/off Pcs low Pnk Powertrain control module (pcm) (under right end of i/p, above blower motor) Range mode sel a Range mode sel b Range mode sel c Range mode selector Red Resume S119 (eng harn, 4cm from glowplug controller breakout) S126 S160 S163 Second vss sig Sensor gnd Set Shift sol a Shift sol b Solid state Speed control switch Tan Timing stepper mtr (high) Timing stepper mtr (low) Tps no.1 gnd Tps no.1 ref volt Tps no.1 sig Tps no.2 gnd Tps no.2 sig Tps no.3 gnd Tps no.3 ref volt Tps no.3 sig Transmission input speed sensor (left side of transmission near front) Transmission speed input Transmission temp input Transmission temperature sensor Vehicle speed input Vehicle speed sensor (on transmission, left rear side) Vehicle speed sensor buffer (on driver's island support above accelerator pedal) Vss hi Vss lo Vss rtn Vss sig 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 32 App 1 sensor App 2 sensor App 3 sensor Brake transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island) Electronic accelerator pedal control (top of accelerator pedal bracket) Engine shutoff solenoid F4 i-3 fuse 15a f3 Fuel sole- noid Fuel solenoid driver Fuel temp. G6 ecm-1 fuse 20a g5 Haz fuse 15a Hazard lamps flasher (inner left side of main support bracket) High Hot at all times Hot in run Hot in run & start (crank) I/p fuse block (mounted on the i/p) Injection pump (top front of engine) J6 trans fuse 15a j5 Low Optical 3 temperature sensor Pnk Red S116 S121 S124 (eng harn, 16cm from left bulkhead grommet toward pcm) S200 (i/p harn, 8cm from breakout for steering column) Stop- g7 Stoplamp switch (at rear of brake pedal support bracket) Timing stepper motor Torque converter clutch & stoplamps switch (opens w/brake pedal depressed) (at rear of brake pedal support bracket) 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 44 (17 cm from rear/lamp harness) (from fuel tank crossmember) g415 (18 cm from breakout for left glow plugs) g112 (18 cm from breakout for left glow plugs) g112 (eng harn, 16cm from single wire conn on glowplug controller) (not used) 87a A/c compressor control relay (right side of driver's island) A/c high pressure cut-off switch (on rear of the a/c compressor) Ecm- bat fuse 20a Eng- bat fuse 15a Fuel lift pump (inside left frame rail, below driver's door) Fuel pump oil pressure indicator switch (left rear of engine) Fuel pump relay (in underhood fuse & relay center) G202 (left side of i/p) Gauges fuse 20a Hot at all times Hot in run & start (crank) I/p fuse block (mounted on the i/p) In line to fuel pump prime (plant use) Instrument cluster Nca Oil press gauge Pnk R100 Red S114 S115 S120 (eng harn, 12cm from breakout for fuel pump relay toward engine) S126 S140 S140 (eng harn, 35cm from pcm conns c2-c3 toward left bulkhead grommet) S141 S146 S150 S154 S400 Service engine soon indicator Service throttle soon indicator Speed meter Tan Wait to start "glow plugs" indicator Water in fuel indicator Water in-fuel indicator sensor (part of fuel injection pump) Water in-fuel input 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 58 "serv eng soon" ind "serv throttle soon" ind (dlc) (partial) (mounted on left side support bracket of steering column) (eng harn, 21cm from breakout for generator) s144 (eng harn, 7cm from main harn in breakout for left bank glowplugs) s145 12v battery (fused) 12v battery fused 3/2 ctrl out A/c enable C10 C11 C12 C13 C14 C15 C16 D10 D11 D12 D13 D14 D15 D16 Data link connector Eng-1 h6 Engine shutoff sol out Fuel heater (top rear of engine) Fuel sol module (5 vref) Fuel sol module feed Fuse 20a Fusible links G112 (18 cm from breakout for left glow plugs) G120 (right top cylinder head) G120 (right top of cylinder head) G202 (left side of i/p) Glow plug control relay (left rear of engine near bulkhead) Hot at all times Hot in run & start (crank) I/p fuse block (mounted on the i/p) Ignition Left bank glow banks Nca Pcm gnd Pnk Powertrain control module (pcm) (under right end of i/p, above blower motor) Red Right bank glow banks S126 S128 S135 S163 (eng harn, 21cm from left bulk- head grommet toward pcm) S203 Serial data sig Shift sol a input Shift sol b input Tps no.2 ref voltage Turbo charger power valve solenoid Turbo chgr pwr vlv ctrl 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (1 of 3) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (1 of 3) for Chevrolet Forward Control P30 1997: 75 (dlc) (partial) (left interior bulkhead on right side of relay bracket) (eng harn, approx 6cm from glowplug control switch breakout) (left interior bulkhead near relay bracket) (body builder installed) g202 (rear of left cylinder head) g114 1-2 shift sol ctrl 2-3 shift sol ctrl 5 volt ref 5v ref A10 A11 A12 A6 a8 B10 B11 B12 Baro press sens sig Barometric pressure (baro) sensor (top of intake manifold, left side in back) Battery feed Brake pedal sw in Brake/transmission shift interlock (btsi) relay (left interior bulkhead on relay bracket) C10 C11 C12 C13 C14 C15 C16 D10 D11 D12 D13 D14 D15 D16 Data link connector Ecm-bat fuse 20a Electronic brake control module (below radiator on first crossmember) Eng bat fuse 15a Engine speed sens in Engine speed sensor (in fuel injection pump) Hot at all times Hot in (on) run I-3 fuse 15a I/p fuse block (dash panel provided by body builder) (body builder installed) Ign feed Pnk Press ctrl sol (hi) Press ctrl sol (lo) Range signal a Range signal b Range signal c Red Ref 5 volt Rtn sensor S110 S111 (eng harn, approx 10cm from generator jumper breakout) S119 S143 S144 S200 (i/p side of eng harn, approx 15cm from left bulkhead grommet) Sensor return Sensor rtn Serial data Service trans out Sig sensor Stoplmp sw in Tan Tcc pwm sol ctrl Tcm ground Tft sig Throttle position sensor (tps) (right side of fuel injection pump) Torque converter clutch (tcc) & stop lamps switch (opens w/brake pedal depressed) (right side of steering column upper support) Tp sens sig Transmission control module (tcm) (left interior bulkhead on top of relay bracket) Vehicle speed sig 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for Chevrolet Forward Control P30 1997: 43 1-2 shift solenoid 10a 2-3 shift solenoid Acc Automatic transmission (a/t) (rear of engine) Battery junction block (left side of engine bulkhead, above relay bracket) Closed in park & neutral Crank fuse (engine harness, in-line fuse block near right side of steering column upper support) Crk (start) Distribution Ecm-1 fuse 20a Fuel injection pump fuel shut-off solenoid (at fuel injection pump) G202 (left interior bulkhead near relay bracket) (body builder installed) Gauges fuse 20a Glow plugs Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Ignition switch Instrument cluster Lock Off On (run) Park/neutral position (pnp) & backup lamps switch (left side near middle of transmission) Pnk Power Pressure control solenoid Red S stud S108 S110 S205 S207 Speedo meter Starter relay (engine bulkhead relay bracket under battery junction block) Starter solenoid (starter at lower right side of engine) Stud System Tcc pwm solenoid Trans Transmission fluid temperature (tft) sensor Transmission range (tr) pressure switch assembly Water in- fuel 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for Chevrolet Forward Control P30 1997: 48 (coil) (eng harn, 10cm from left glowplug breakouts) s123 (eng harn, 12cm from left glowplug breakouts) s117 (rear of left cylinder head) (rear of left cylinder head) g114 Auxiliary engine coolant fan relay (left side of engine bulkhead above relay bracket) Battery junction block (left side of engine bulkhead, above relay bracket) C (not used) D100 (engine harness approx. 20 cm from brake pressure differential switch breakout) Eng-1 fuse 20 a Fuel heater (rear of intake manifold, part of fuel/water separator) (filter) Fuel injection pump cold advance solenoid (in fuel injection pump) Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch (opens as temperature increases) (right rear of right cylinder head) Fusible link G114 G114 (rear of left cylinder head) Glow plug stud Glowplug control switch (rear of left cylinder head) Ground Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Idle speed control (isc) solenoid actuator (bracket on front of fuel injection pump) Ign feed Ind lamp out Left bank glowplugs (cylinder heads below valve covers) Nca Pnk Power distribution system Red Right bank glowplugs (cylinder heads below valve covers) S109 (eng harn, approx 33cm from left bulkhead grommet) S115 (eng harn, approx 11cm from generator b+ breakout) S116 S118 S126 (eng harn, approx 20cm from brake pressure diff sw breakout) S127 (eng harn, approx 20cm from brake pressure diff sw breakout) S143 Starter feed Stud Trans fuse 10a Vehicle speed sensor (vss) (left rear of transmission near center) Vehicle speed sensor (vss) buffer (mounted under bracket bolted to left side of interior bulkhead) Vss Vss out Vss rtn Vss sig Water in-fuel sensor (part of fuel/water separator (filter) at rear of intake manifold) 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for Chevrolet Forward Control P30 1997: 28 (eng harn, 10cm from left glowplug breakouts) s123 (eng harn, 12cm from left glowplug breakouts) s117 Auxiliary engine coolant fan relay (left side of engine bulkhead above relay bracket) Battery junction block (left side of engine bulkhead, above relay bracket) Ecm-1 fuse 20 a Eng-1 fuse 20 a Fuel heater (rear of intake manifold, part of fuel/water separator (filter)) Fuel injection pump fuel shut-off solenoid (at fuel injection pump) Fusible link G119 (generator bracket) Glow plug stud Glowplug control switch (rear of left cylinder head) Ground Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Ign feed Left bank glowplugs (cylinder heads below valve covers) Nca Pnk Power distribution system Red Right bank glowplugs (cylinder heads below valve covers) S108 S116 S118 Starter feed Stud 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for Chevrolet Forward Control P30 1997: 45 (not used) 10a A pnk Acc Battery junction block (left side of engine bulkhead, above relay bracket) Clutch pedal position (cpp) switch (closed with clutch pedal depressed) (left side of brake pedal bracket) Crank fuse (engine harness, in-line fuse block near right side of steering column upper support) Crk (start) D100 (engine harness, approx. 29 cm from brake pressure differential switch breakout) Fuel injection pump cold advance solenoid (in fuel injection pump) Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch (opens as temperature increases) (right rear of right cylinder head) G119 (generator bracket) G202 (left interior bulkhead near relay bracket) (body builder installed) Gauges fuse 20a Glow plugs Ground Hot at all times Hot in (on) run & start (crank) I/p fuse block (dash panel provided by body builder) (body builder installed) Idle speed control (isc) solenoid actuator (bracket on front of fuel injection pump) Ign feed Ignition switch Ind lamp out Instrument cluster Lock Nca Off On (run) Pnk Power distribution system Red S stud S109 (eng harn, approx 33cm from left bulkhead grommet) S110 S115 (eng harn, approx 11cm from generator b+ breakout) S118 S126 (eng harn, approx 25 cm from brake pressure differential sw breakout) S127 (eng harn, approx 25 cm from brake pressure differential sw breakout) S205 S207 Starter relay (engine bulkhead relay bracket under battery junction block) Starter solenoid (starter at lower right side of engine) Stud Water in- fuel Water in-fuel sensor (part of fuel/water separator (filter) at rear of intake manifold)
7.4L 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 64 (10cm from breakout for generator) g120 (engine) 1-2 shift sol ctrl 12v ign feed 2-3 shift sol ctrl A pnk A/c compressor control relay (right side of driver's island) A/c enable A/t output speed sensor (0n transmission, left rear side) Anti- lock brakes system Cam posit sens signal Camshaft position sensor (internal to ignition distributor) Ckp posit sens rtn Crankshaft position sensor (on lower right front of engine, behind torsional damper) Ect sens signal Egr posit input Egr sol ctrl Evap can purge valve Evaporative emissions canister purge solenoid (at top left center of engine behind a/c compressor) Ground Heated oxygen sensor no.1 (on right exhaust pipe ahead of catalytic converter) Idle air control valve motor (on right side of engine at throttle bore intake) Idle air ctrl a hi (iac) Idle air ctrl b lo (iac) Ign feed Injector no.1 ctrl Injector no.2 ctrl Injector no.3 ctrl Injector no.4 ctrl Injector no.5 ctrl Injector no.6 ctrl Injector no.7 ctrl Injector no.8 ctrl Intake air temp sens Knock sens signal Left knock sensor (on left side of engine block below exhaust manifold) Left post cat sens hi Left sens hi (pre cat) Left sens lo (pre cat) Map signal Mass air flow sens sig Nca Pnk Pnk d Pnk pnk pnk Right knock sensor (on right side of engine block ahead of starter) Right post cat sens lo Right sens hi (pre cat) Right sens lo (pre cat) S126 S131 (eng harn, 13cm from breakout for egr, toward map sensor) Sens rtn Sens sig Sensor rtn Sensor signal Signal Tan Tan a Tcc sol ctrl Temp sens input Throttle posit sens Vehicle control module (vcm) (mounted to top of radiator support) Vss out-abs Vss rtn Vss signal 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 41 (eng harn, 11cm from breakout for egr, toward relays) s128 Automatic transmission Ecm-1 fuse 20a Eng-1 fuse 20a Fluid temperature sensor (internal) Force motor Fuel inj. no.1 Fuel inj. no.2 Fuel inj. no.3 Fuel inj. no.4 Fuel inj. no.5 Fuel inj. no.6 Fuel inj. no.7 Fuel inj. no.8 G117 (engine) (13 cm from breakout for ignition coil) Heated oxygen sensor no.2 (on left exhaust pipe ahead of catalytic converter) Heated oxygen sensor no.3 (on right exhaust pipe behind of catalytic converter) Heated oxygen sensor no.4 (on left exhaust pipe behind of catalytic converter) Hot in run or start (crank) I/p fuse block (mounted on the i/p) Ignition Intake air temp sensor (mounted in fresh air intake behind right side of air filter box) Linear egr solenoid valve (on left side of intake plenum) Nca Pnk Pnk d Pnk e Pnk n pressure Pnk pnk Red p pressure S121 S133 S135 S158 S159 Solenoid 1-2 Solenoid 2-3 Switch Tan Tan a Toward eng) 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 38 (10 cm from breakout for generator (engine) g120 (17 cm from rear/lamp harness) (from fuel tank crossmember) g415 (eng harn, 20cm from breakout for cruise control module, toward vcm) (eng harn, 4cm from breakout for cruise control module, toward relays) (eng harn, 7cm from breakout for left front wheel speed sensor, toward eng) s127 A/c high pressure cut-off switch (on rear of the a/c compressor) Eng-bat fuse 15a f1 Engine coolant temperature sensor (on center lower left side of engine cylinder head) Fuel gauge Fuel pump & sender (on top of fuel tank) Fuel pump/ oil pressure switch (on engine block, top rear, behind distributor) G202 (left side of i/p) Gauges fuse 20a Ground distribution system Hot at all times Hot in run or start (crank) I/p fuse block (mounted on the i/p) Instrument cluster Manifold absolute pressure (map) sensor (mounted into intake manifold behind thermostat) Mass air flow sensor (mounted in fresh air intake behind air filter box) Nca Oil press gauge Pnk R100 (4 cm from breakout for auxiliary cooling fan) Red S119 (eng harn, 4cm from breakout for generator, toward cruise control module) S120 S126 S132 S140 S141 S150 S154 Service engine soon indicator Speed meter Tan Throttle position sensor (on right side of intake plenum at throttle intake) Trans fuse 10a 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 71 (10 cm from breakout for generator) (engine) g120 (20 cm from breakout for connector under the i/p) g202 (i/p harn, 15cm from breakout for abs harn) s202 (mounted on left side support bracket of steering column) 5v ref 5v return 87a A/c request signal Anti-lock brakes system B + Brake sw input Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island) Check engine lp ctrl Connector (dlc) (partial) Cruise control module (on radiator support bracket, behind left side of vehicle control module) Cruise ctrl engaged Cruise ctrl sig-engaged Cylinder no.1 Cylinder no.2 Cylinder no.3 Cylinder no.4 Cylinder no.5 Cylinder no.6 Cylinder no.7 Cylinder no.8 Data link Distributor Ecm-bat fuse 20a Elec spk timing ctrl sig Elec spk timing ctrl signal Est ctrl Evap can purge vac in Evaporative emissions canister purge vacuum switch (top left center of engine behind a/c compressor) For tachometer Force mtr feed Force mtr rtn Fuel pmp rly ctrl Fuel pump prime connector Fuel pump relay (at relay center right side of main support at driver's island) G120 (engine) (10 cm from breakout for generator) Ground High voltage coil wire Hot at all times Hot in run I-3 fuse 15a I/p fuse block (mounted on the i/p) Ign feed Ignition coil (on bracket at rear of intake plenum) Ignition coil driver (on bracket at rear of intake plenum) Input speed sensor (hd transmission only) Pnk Pnk a Press sw sig Provision a Red S114 S116 S126 S200 (eng harn, 45cm from breakout for map sensor, toward bulkhead) S203 Sens ground Sens rtn Serial data Service circuit power Spark plugs Speed sensor input Tcc/stoplamp input Torque converter clutch (tcc) & stoplamps switch or tcc stoplamp switch (opens w/brake depressed) (at rear of brake pedal support bracket) Vehicle control module (vcm) (mounted to top of radiator support) Vss output Vss signal 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 3) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 3) for Chevrolet Forward Control P30 1997: 94 (20 cm from breakout for chassis harness wires) (engine) (eng harn, 4cm from breakout for engine coolant fan motor) 3-2 ctrl out 470 or 452 5v ref A/t input speed sensor (on auto transmission left center) A10 A11 A12 A13 A14 A15 A16 B10 B11 B12 B13 B14 B15 B16 Battery Brake sw input Bypass 5 volts Can purge sol out Data link connector (dlc) (partial) (mounted on left side support bracket of steering column) Diag enable-powertrain E10 E11 E12 E13 E14 E15 E16 Ect sens input Egr input Egr sol out Electronic 4-spd automatic overdrive transmission Evaporative canister purge solenoid (top left center of intake manifold) F10 F11 F12 F13 F14 F15 F16 Force motor Force motor hi Force motor low Fuel inj ctrl Fuel pmp rly ctrl Ground High idle sw out Hot in run & start (crank) I/p fuse block (mounted on the i/p) Ic output Idle air control valve motor (on left side of throttle body intake) Idle air valve ctrl Ignition Knock sens input Knock sensor (ks) (on right side of engine block ahead of starter) Map sens input Oil press input Oxygen sens input Oxygen sensor (in exhaust stream ahead of muffler) Pcm ground Pnk Pnk pnk Powertrain control module (pcm) (on left side of driver's island) Range mode sel a Range mode sel b Range mode sel c Range mode selector Red Ref pulse input hi Ref pulse input lo S118 S126 Sens ground Serial data uart Serv eng soon ind ctrl Shift sol a out Shift sol b out Shift sol. a Shift sol. b Shift sol. c Shift sol. d Speed sens input high Speed sens input lo Tan Tp sens in Trans fuse 10a Trans temp input Trans. temp. Vehicle speed input 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 3) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 3) for Chevrolet Forward Control P30 1997: 46 (20 cm from breakout for chassis harness wires) (engine) (contact) (eng harn, 17cm from breakout for engine coolant fan motor, toward cruise control module) (eng harn, 24cm from breakout for cruise control module, toward eng) (eng harn, 4cm from breakout for generator) (i/p harn, 22cm from left bulk- head grommet under i/p) s200 12v 20a Bat fuse e1 Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island) Cruise control module (on radiator support bracket) Ecm- e2 Engine coolant temperature sensor (front & center of engine coolant intake) Fuel pump & oil pressure indicator switch (on engine block, front left lower side behind timing cover) Ground H6 eng-1 fuse 20a Hot at all times Hot in run Hot in run & start (crank) I-3 fuse 15a I/p fuse block (mounted on the i/p) Idle speed control actuator (on throttle body) Linear egr solenoid valve (no component location available) Manifold absolute pressure (map) sensor (on bracket mounted on right side of intake manifold) Pnk Red S114 S119 S120 S121 S126 S127 S128 Second. vss Tan Tcc/brake switch or torque convertor clutch (tcc) & stop lamps switch (opens w/brake pedal depressed) (at rear of brake pedal support bracket) Tcc/stoplamp input Throttle position sensor (on left side of throttle body) Vehicle speed sensor (on left rear side of transmission) Vehicle speed sensor buffer (on driver's island support above accelerator pedal) Vss Vss hi Vss lo Vss out Vss return Vss sig 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 3) for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 3) for Chevrolet Forward Control P30 1997: 43 (17 cm from rear/lamp harness) (from fuel tank crossmember) g415 (20 cm from breakout for chassis harness wires) (engine) Acc Battery junction block (on forward left side of bulkhead) Bypass C103 Dist. ref hi Dist. ref lo Distributor Ecm 1 fuse 20a Fuel gauge Fuel pump & sender (on top of fuel tank) Fuel pump prime connector Fuel pump relay (at relay center right side of main support at driver's island) G202 (left side of i/p) Gauges fuse 20a High voltage ignition coil wire Hot at all times Hot in run & start (crank) I/p fuse block (mounted on the i/p) Ignition coil (on bracket at rear of intake plenum) Ignition module Ignition switch Instrument cluster Lock off Oil press gauge Pickup coil Pnk Red Run S107 S121 S126 S150 S154 S201 Service engine soon indicator Speed meter Start Tachometer test lead Tan Throttle body fuel injector no.1 (on top of intake manifold) Throttle body fuel injector no.2 (on top of intake manifold)
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Back-up Lamps Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 11 (left side of transmission) backup lamps switch A/t Hot in run I/p fuse block M/t Park/neutral position (pnp) & backup lamp switch (left side of transmission) Provision for left backup lamp Provision for right backup lamp S403 (rear lamps harness, 65 or 120cm rearward of taillamps extension to rear lamps harness breakout) Turn b/u fuse 15a Turn signal flasher (i/p fuse block) Back-up Lamps Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Back-up Lamps Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 11 (left side of transmission) backup lamp switch 7.4l vin n (l19) engine All except 7.4l vin n (l19) engine Hot in run I/p fuse block Park/neutral position (pnp) & backup lamp switch (left side of transmission) Provision for backup lamps (on left frame rail near rear lamp harness) Provision for rear mounted camera (near breakout for steering column harness) S134 (engine harn, near breakout for starter motor) Turn b/u fuse 15a Turn signal flasher (i/p fuse block) Exterior Lamps Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Exterior Lamps Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 50 (forward lamps harn, 4cm from horn conn breakout) s101 (i/p harness headlamp switch breakout, 8cm before i/p fuse block breakout) s208 (rear lamps harness, 55 or 110cm from tail/ stoplamps extension harness to rear lamps harness, near left frame rail and fuel tank) s402 Backup lamps circuit C205 (near i/p fuse block) G114 (all except diesel w/ m/t & gas v6 engine) (rear of left cylinder head) G119 (diesel w/ m/t & gas v6 engine) (diesel: generator bracket; gas: thermostat housing) Hazard Hazard lamps flasher (left inner bulkhead on relay bracket) Head Headlamps switch Hot at all times Hot in run I/p fuse block Instrument cluster Interior lamps system Left front park & turn signal (t/s) lamp Left front side marker lamp Left rear license lamps Left turn ind. Normal Off Park Provision for center high mounted stop lamp Provisions for left rear side marker lamp Provisions for left tail/stop & turn signal lamps Provisions for marker lamps Provisions for right rear side marker lamp Provisions for right tail/stop & turn signal lamps Right front park & turn signal (t/s) lamp Right front side marker lamp Right rear license lamps Right turn ind. S101 (forward lamps harn, 4cm from horn conn breakout) S104 (forward lamps harn, 15cm after right lamps breakout) S105 (forward lamps harn, 10cm before right lamps breakout) S143 S404 (rear lamps harness, 5cm from right tail- lamps breakout) S405 (rear lamps harness, 5cm from left taillamps breakout) Stop Stop haz fuse 15a Tail Tail lamps fuse 20a Torque converter clutch & stop lamps switch (right side of steering column upper support) Turn Turn b/u fuse 15a Turn left Turn right Turn signal flasher Turn signal switch Exterior Lamps Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Exterior Lamps Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 50 (forward lamp harn, 5cm from left head- lamp breakout) s102 (forward lamp harn, 5cm from right headlamp breakout) s106 Backup lamps circuit Cruise control system G112 (6.5l vin f (l65) engine) (near breakout for left glow plugs) G120 (7.4l vin j (l29) engine) (near breakout for generator) Hazard Hazard lamps flasher (inner left side of main support bracket) Head Headlamps switch Hot at all times Hot in run I/p fuse block Instrument cluster Interior lamps system Left front park & turn signal (t/s) lamp Left turn indic No ground available (7.4l vin n (l19) engine) (near breakout for chassis harness) Normal Off Park Provision for center high mounted stop lamp Provisions for left front side marker lamp Provisions for left rear license lamp Provisions for left rear side marker lamp Provisions for left tail, stop & turn signal (t/s) lamps Provisions for marker lamps Provisions for right front side marker lamp Provisions for right rear license lamp Provisions for right rear side marker lamp Provisions for right tail, stop & turn signal (t/s) lamps Right front park & turn signal (t/s) lamp Right turn indic S105 (forward lamp harn, 9cm from right headlamp breakout) S117 (l19 engine) (engine harness, 43cm from engine cooling fan notor harn breakout) (l29/l65 engine) (engine harness, 7cm from windshield wiper motor breakout) S124 (engine harness, near cruise control harness breakout) S126 S152 (i/p harness, 25cm from headlamp switch connector) S402 (rear lamp harness, rear of vehicle) S404 (rear lamp harness, rear of vehicle) S405 (rear lamp harness, rear of vehicle) Stop haz fuse 15a Tail lamps fuse 20a Torque converter clutch & stop lamps switch (brake pedal support bracket) Turn Turn b/u fuse 15a Turn left Turn right Turn signal flasher Turn signal switch
GROUND DISTRIBUTION Ground Distribution Wiring Diagram, Commercial Chassis (1 of 2) for Chevrolet Forward Control P30 1997 List of elements for Ground Distribution Wiring Diagram, Commercial Chassis (1 of 2) for Chevrolet Forward Control P30 1997: 57 (forward lamps harness by left lamps breakout) (body builder installed) g106 (forward lamps harness by right lamps breakout) (body builder installed) g107 (left frame rail to rear of left cylinder head) g112 (left interior bulkhead near relay bracket) (body builder installed) g202 (rear of left cylinder head) g114 (rear of right cylinder head to battery) g120 87a A/c compressor clutch coil A/c compressor clutch coil A/c compressor clutch coil diode (d101) A/c compressor relay A/t only Automatic transmission only Auxiliary engine coolant fan Auxiliary engine coolant fan a/c pressure switch Battery Braided Brake/ transmission shift interlock (btsi) relay Brake/ transmission shift interlock (btsi) solenoid Data link connector (dlc) Daytime running lamp (drl) control module Daytime running lamp (drl) relay Diesel Engine G114 (rear of left cylinder head to left frame rail) G207 Gasoline Gasoline engines Heated oxygen sensor (ho2s) left pre- convertor Heated oxygen sensor (ho2s) post converter (4.3l vin w (l35) engine) heated oxygen sensor (ho2s) left post converter (5.7l vin r (l31) engine) Heated oxygen sensor (ho2s) right post converter (5.7l vin r (l31) engine) Heated oxygen sensor (ho2s) right pre- convertor Horn hi tone (f-note) Horn low tone (a-note) I/p lamps dimmer switch Instrument cluster Left headlamp Low engine coolant level indicator sensor Nca Nca (899) Park brake indicator switch Prndl lamp Right headlamp S103 (forword lamps harness, approx 4 cm after (hi tone) horn breakout) S110 (engine harness, approx 4 cm from bulkhead connector breakout) S110 (engine harness, approx 4 cm from electronic brake control module) S118 (engine harness, at left rear of engine, approx 4 cm from ground) S124 (engine harness, 13 cm from a/c compressor high pressure cut- off switch breakout) S124 (engine harness, approx 13 cm from a/c compressor high pressure cut-off switch breakout) S205 (i/p harness, approx 4 cm before i/p fuse block breakout) Seat belt/ lamps alarm Secondary battery Starter relay Steering column Steering column on lower mounting stud of headlamps dimmer switch W/6.5l vin y (l57) diesel engine W/o daytime running lamps (drl) Ground Distribution Wiring Diagram, Commercial Chassis (2 of 2) for Chevrolet Forward Control P30 1997 List of elements for Ground Distribution Wiring Diagram, Commercial Chassis (2 of 2) for Chevrolet Forward Control P30 1997: 44 (a/t-engine harness, approx 7 cm from bulkhead grommet, m/t-engine harness, approx 16 cm from a/c compressor switch breakout) (engine harness, approx 23-30 cm from breakout to maf sensor) (engine harness, approx 7 cm from tps breakout) (generator bracket) (rear of left cylinder head) (rear of left cylinder head) g114 (rear of left cylinder head) (right rear of rear lamps harness) (body builder installed) g415 (tail & stop lamps extension harness at crossmember in front of fuel tank) g415 (thermostat housing) g110 5.7l vin r (l31) engine only A/c compressor high pressure cutoff switch A/t Brake pressure differential switch Data link connector (dlc) Diesel Drain wire (shield) Electronic brake control module Electronic ignition (ei) coil driver module Evaporative emissions (evap) canister purge vacuum diagnostic switch Fuel heater Fuel pump relay Fuel sender & fuel pump G114 G119 (m/t) g114 (a/t) Gasoline Glow plug control switch Instrument cluster M/t Mass air flow (maf) sensor Nca Nca (450) R100 (1100 ohms .75 watts) S138 S140 (a/t-engine harness, approx 4 cm from vss connector) S141 S143 S143 (engine harness, approx 6 cm from bulkhead connector breakout) S161 (electronic brake control module harness, approx 15 cm from right wheel speed sensor breakout) Side marker lamp,left rear (provisions for) Side marker lamp,right rear (provisions for) Transmission control module (tcm) Vehicle control module (vcm) Vehicle speed sensor (vss) buffer Water in-fuel sensor Ground Distribution Wiring Diagram, Motor Home Chassis (1 of 2) for Chevrolet Forward Control P30 1997 List of elements for Ground Distribution Wiring Diagram, Motor Home Chassis (1 of 2) for Chevrolet Forward Control P30 1997: 65 (10 cm from breakout for generator) (13 cm from breakout for ignition coil) (102 cm from breakout harness for the right headlamps) (right frame rail ground) g118 (18 cm from breakout for chassis harness wires) (18 cm from breakout to left glow plugs) (left park lamp ground) g112 (6.5l vin f (l65) engine) (7.4l vin j (l29) & vin n (l19) (engines) (left frame rail ground) (23 cm from breakout for the right headlamps) (right park lamp ground) g106 (7.4l vinj (l29) engine) (6.5l vinf (l65) engine) (dual) (dual) c (engine) (7.4l vin n (l19) engine) (g120) (g112) (forward lamp harness, 18 cm to breakout for right headlamp) (single) (single) a 6.5l 7.4l 7.4l vin j (l29) engine A/c compressor high pressure cutoff switch A12 Battery Braided strap C1 vin f (l65) C3 vin j (l29) Center high mounted stop lamps (provisions, for) Cruise control module Cruise control module (7.4l vin n (l19) & 7.4l vin j (l29) engines) Data link connector (dlc) (7.4l vin j & 6.5l vin f engines only) Daytime running lamps relay 2 (w dual headlamps) Drl Electronic brake control module Electronic ignition control module Engine Evaporative emissions canister purge vacuum diagnostic switch Except drl Fuel pump relay G113 (left frame rail) G118 (right framerail, behind transmission) G120 (right frame rail ground) Instrument cluster Left headlamp Left high beam headlamp (w/ dual headlamps) Left horn Mass air flow sensor (7.4l vin j (l29) engine) Nca Park brake differential switch Park brake motor Park brake relay Park brake solenoid Powertrain control module (pcm) (6.5l vin f (l65) engine) Powertrain control module (pcm) (7.4l vin n (l19) engine R101 (no resistance or wattage values available) Right headlamp Right high beam headlamp (w/ dual headlamps) Right horn S104 S124 (engine harness, 4-11 cm from breakout for cruise control module) S126 (vin j, vin n-engine harness, 5 cm from breakout for cruise control module, vin f-engine harness, 22 cm from breakout for windshield wiper motor) S132 (vin j-engine harness, 20 cm from breakout for cruise control module, vin f-engine harness, 35 cm from pcm c1 or c2) S138 (engine harness, 7 cm from breakout for maf nca sensor) S139 (engine harness, 13 cm from breakout for maf sensor) S140 (vin j-engine harness, 20 cm from breakout for cruise control module, vin f-engine harness, 35 cm from pcm c2 or c3) Secondary battery (diesel only) Stop lamp switch Vehicle control module (vcm) (7.4l vin j (l29) engine) Vehicle control module (vcm) (7.4l vin j (l29) engine) powertrain control module (pcm) (6.5l vin f (l65) engine) Vehicle speed sensor buffer (7.4l vin n (l19) & 6.5l vin f (l65) engines) Vss shield Ground Distribution Wiring Diagram, Motor Home Chassis (2 of 2) for Chevrolet Forward Control P30 1997 List of elements for Ground Distribution Wiring Diagram, Motor Home Chassis (2 of 2) for Chevrolet Forward Control P30 1997: 53 (17 cm from rear/lamp harness, near fuel tank crossmember) g415 (7.4l vin j (l29) engine) (engine) (13 cm from breakout for the ignition coil) g117 (6.5l vin f (l65) engine) (no ground location available) 6.5l vin f (l65) engine 6.5l vin f (l65) engine (nj9) 80 gallon 7.4l vin j (l29) engine 7.4l vin n (l19) & 7.4l vin j (l29) engines 87a A/c compressor clutch A/c compressor control relay (7.4l vin n (l19) engine) A/c compressor relay Automatic transmission shift interlock control relay Automatic transmission shift interlock control solenoid Auxiliary engine coolant fan a/c pressure switch Canadian models only Clutch) D100 Data link connector (dlc) (7.4l vin j (l29) & 6.5l vin f (l65) engines) Daytime running lamp control module (drl) Daytime running lamp relay (drl) Engine coolant fan motor Engine coolant level (ecl) switch (6.5l vin f (l65) engine) Fuel heater Fuel lift pump Fuel pump & sender Fuel sender G202 (left side of i/p) G416 (left frame rail) Glow plug relay Glowplug controller) Heated oxygen sensor left post converter Heated oxygen sensor left pre converter Heated oxygen sensor right post converter Heated oxygen sensor right pre converter Ho2s sensors) I/p fuse block Instrument cluster Instrument panel dimmer switch Left side marker lamp (provisions for) Nca Powertrain control module (pcm) Right side marker lamp (provisions for) S122 (engine harness, 15-20 cm from a/c compressor nca S123 (engine harness, 15-25 cm from a/c compressor clutch) S150 (i/p harness, 16 cm from breakout for bulkhead connector) S203 (vin n-i/p harness, 41 cm from bulkhead grommet in steering column harness, vin j-i/p harness, 4 cm from breakout for widshield wiper motor, vin f-engine harness, 14 cm from bulkhead grommet) S400 (rear fuel sender harness) S500 Seatbelts and lamp module Starter relay Steering column ground Transmission range indicator lamp Water in fuel indicator sensor
HEADLIGHTS Headlight Wiring Diagram, Commercial Chassis with DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Commercial Chassis with DRL for Chevrolet Forward Control P30 1997: 49 (provision for fog lamps) (rear of left cylinder head ) (all except v6 & diesel w/ m/t) g114 87a Acc All gasoline; diesel w/ a/t Bulb test C204 (i/p harness, near drl module) Daytime running lamps module (attached to i/p harness at steering column) Daytime running lamps relay (left interior bulkhead, on relay bracket) Diesel w/ m/t Diode network (15cm from i/p fuse block breakout) Drl indicator Drl relay ctrl Fog lamps G106 (forward lamps harness, by right lamps breakout) G119 (v6 & diesel w/ m/t) (diesel: generator bracket; gas: thermostat housing) G202 (left interior bulkhead, near relay bracket) Gauges fuse 20a Ground Head Headlamp dimmer switch Headlamps switch Hi beam indicator Hi bm feed Hi bm indicator Hot at all times Hot in run or start I/p fuse block Ignition Ignition switch Instrument cluster Lamp feed Left head- lamp Lock Off Park Park brake in Park brake indicator switch (on park brake) Pnk Right head- lamp Run S103 S118 S143 S205 S207 S216 (i/p harn, approx 24cm from i/p fuse block breakout) Start Tan Headlight Wiring Diagram, Commercial Chassis without DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Commercial Chassis without DRL for Chevrolet Forward Control P30 1997: 19 All gasoline; diesel w/ a/t Diesel w/ m/t G106 (forward lamps harness, by right lamps breakout) G114 (all except diesel w/ m/t & gas v6) (rear of left cylinder head) G119 (diesel w/ m/t & gas v6) (diesel: generator bracket; gas: thermostat housing) Head Headlamps dimmer switch Headlamps switch Hi beam indicator Hot at all times Instrument cluster Left hi headlamp Off Park Right lo headlamp S103 S118 S143 Tan Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps with DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps with DRL for Chevrolet Forward Control P30 1997: 51 (forward lamps harn, 12cm to breakout for left headlamp) s101 (provision for fog lamps) 87a Acc Bulb test Daytime running lamps module (attached to i/p harness at steering column) Daytime running lamps relay #2 Daytime running lamps relay (on main support bracket at driver's island) Diode network Drl indicator Drl relay ctrl Fog lamps G106 (forward lamps harness, by right lamps breakout) G120 (7.4l vin j (l29)) (near breakout for generator) (7.4 vin n (l19): n0 ground point avail., near breakout for chassis harness) G202 (under i/p) G202 under i/p) Gauges fuse 20a Ground Head Head- lamp dimmer switch Headlamps switch Hi beam indicator Hi bm feed Hi bm indicator Hot at all times Hot in run or start I/p fuse block Ignition Ignition switch Instrument cluster Instrument cluster system Lamp feed Left head- lamp Left high beam head- lamp Lock Off Park Park brake in Park brake indicator switch (on park brake) Pnk Right head- lamp Right high beam head- lamp Run S104 S126 S150 S151 (i/p harn, 5cm from breakout for headlamp sw) S154 S162 (i/p harn, 70cm from i/p fuse block) Start Tan Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps without DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Motor Home Chassis with Dual Headlamps without DRL for Chevrolet Forward Control P30 1997: 19 (forward lamp harn, 12cm to breakout for left headlamp) G106 (23cm from breakout for right headlamps) G202 (under i/p) Head Head- lamp Headlamps dimmer switch Headlamps switch Hi beam indicator Hot at all times Instrument cluster Left hi head- lamp Left high beam head- lamp Off Park Right high beam head- lamp Right lo S104 S150 Tan Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps with DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps with DRL for Chevrolet Forward Control P30 1997: 47 (provision for fog lamps) 87a Acc Bulb test Daytime running lamps module (attached to i/p harness at steering column) Daytime running lamps relay (on main support bracket at driver's island) Diode network Drl indicator Drl relay ctrl Fog lamps G106 (forward lamps harness, by right lamps breakout) G120 (7.4l vin j (l29)) (near breakout for generator) (7.4 vin n (l19): n0 ground point avail., near breakout for chassis harness) G202 (under i/p) G202 under i/p) Gauges fuse 20a Ground Head Head- lamp dimmer switch Headlamps switch Hi beam indicator Hi bm feed Hi bm indicator Hot at all times Hot in run or start I/p fuse block Ignition Ignition switch Instrument cluster Instrument cluster system Lamp feed Left head- lamp Lock Off Park Park brake in Park brake indicator switch (on park brake) Pnk Right head- lamp Run S104 S126 S150 S151 (i/p harn, 5cm from breakout for headlamp sw) S154 S162 (i/p harn, 70cm from i/p fuse block) Start Tan Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps without DRL for Chevrolet Forward Control P30 1997 List of elements for Headlight Wiring Diagram, Motor Home Chassis with Single Headlamps without DRL for Chevrolet Forward Control P30 1997: 16 G106 (23cm from breakout for right headlamps) G202 (under i/p) Head Headlamp Headlamps dimmer switch Headlamps switch Hi beam indicator Hot at all times Instrument cluster Left hi headlamp Off Park Right lo S104 S150 Tan
HORN Horn Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Horn Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 18 (1997) s103 (1998) s150 (forward lamp harness, 11 cm from right horn breakout) (left interior bulkhead) (left interior bulkhead) (body builder installed) g202 C 1995 vftc G106 (body builder installed) (left lamps breakout) G107 (body builder installed) (right lamps breakout) Horn relay Horn switch Horn/dm fuse 20a Hot at all times I/p fuse block Left horn (low tone a-note) (body builder installed) Right horn (high tone f-note) (body builder installed) S100 S204 S205 Steering wheel Horn Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Horn Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 18 (body builder installed) (forward lamp harness, 27 cm from left headlamp breakout) (i/p harness, near bulkhead connector) Body builder connector (partial) C 1995 vftc C203 Horn relay (on driver's island) Horn switch Horn/dm fuse 20a Hot at all times I/p fuse block Left horn (body builder installed) Right horn (body builder installed) S100 S104 S153 S204 Steering wheel
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram, Motor Home Chassis (1 of 2) for Chevrolet Forward Control P30 1997 List of elements for Instrument Cluster Wiring Diagram, Motor Home Chassis (1 of 2) for Chevrolet Forward Control P30 1997: 96 (5 bulbs) (abs harn, 11 cm from abs ground breakout) (body builder installed) (i/p harn, 70 cm from fuse block) (i/p harn, near fuse panel) (l19 only) (l19/l65) (l65 only) (l65) (l19) (under left side of i/p) Abs ind. Acc Anti-lock brake system Auto park ind. Coolant temperature gauge Daytime running lamps control module (near steering column) Daytime running lights ind. (w/ drl) Diesel Diode network Ecm-1 fuse 20a Electronic brake control module (on abs cross member) Eng-1 fuse 20a Engine controls system Engine controls system (diesel only) Engine coolant level switch (diesel only) (lower left end of surge tank) Engine oil pressure gauge sender (top left rear of engine) Exterior lights system Fasten belts ind. Fuel gauge Fuel pump switch & engine oil pressure gauge sensor (front left side of engine) G202 G202 (under left side of i/p) Gages fuse 20a Gasoline Glow plugs ind. (diesel) Gnd Headlights system Headlights system (w/ drl) Hi beam ind. Hot in run Hot in run or start I/p fuse block Ign Ign feed Ignition switch Illumination lamps Ind ctrl Instrument cluster Interior lights system L19 & l65 L19/165 L29 Left turn ind. Lock Low coolant ind. (diesel) Off Oil pressure gauge Park brake in Park brake ind. Park brake indicator switch (park brake bracket support) Pnk Provision for body builder Red Right turn ind. S121 S126 S128 S135 S149 S150 S154 S162 S165 (i/p harn, 18 cm from headlamp switch breakout) S166 S203 Service engine soon ind. Service throttle soon ind. (diesel) Speedometer Start Tan Twisted pair Vehicle control module (l29 only) (on left radiator support) Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (l19/l65 only) (behind left side of i/p) Voltmeter Vss (hi) Vss (lo) Vss out Vss rtn Vss sig W/ drl W/ z49 W/o z49 Warning system Water in fuel ind. (diesel) Water-in-fuel sensor (diesel only) (part of fuel injection pump) Instrument Cluster Wiring Diagram, Motor Home Chassis (2 of 2) for Chevrolet Forward Control P30 1997 List of elements for Instrument Cluster Wiring Diagram, Motor Home Chassis (2 of 2) for Chevrolet Forward Control P30 1997: 24 (body builder installed) 1200- 1600 psi <450psi Battery junction block Diesel Diode d300 Diode d301 Engine coolant temperature gauge sender (front of engine) Fuel level sender (top of fuel tank) Fuel sender & fuel pump (top of fuel tank) Gasoline Hot at all times Hot in run I/p auxiliary fuse block Park Park brake low pressure switch (on right frame rail behind transmission) Park brake pressure valve solenoid Park brake pump motor (on right frame rail behind transmission) Park brake pump motor relay (on right frame rail behind transmission) Park brake pump motor switch (on right frame rail behind transmission) Pnk Red S115 S364
INTERIOR LIGHTS Interior Light Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Interior Light Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 32 (5) (steering column on lower mounting stud of headlamps dimmer switch) Breakout) C207 Dash lamps input Dim Dome lamp switch Exterior lights system G119 (diesel m/t) g114 (others) G207 Head Headlamps switch High Horn dim fuse 20a Hot at all times I/p fuse block I/p lamps dimmer switch Instr lps fuse 5a Instrument cluster Light switch Off Panel lamps switch Park Prndl lamp Provision for dome lamp (i/p harn, first breakout from interior bulkhead) Provision for marker lamps S118 (diesel m/t) s143 (others) S204 S205 Seat belt alarm (i/p fuse block) Steering column Tail lps fuse 20a Interior Light Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Interior Light Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 32 (6) (i/p harn, 25 cm from head- lamp switch conn) (left side of i/p) (vin n: i/p harn, under instr panel; vin j: i/p harn, near wiper motor breakout; vin f: engine harn, near engine side of bulkhead) Dim Dome lamp switch Exterior lights system G202 Head Headlamps switch High Horn dimmer fuse 20a Hot at all times Hot with park or headlamp switch on I/p fuse block Instr lps fuse 5a Instrument cluster Instrument panel dimmer switch Lamp Light switch Off Panel lamps switch Park Provision for dome b Provision for roof marker lamps S150 S152 S153 S155 S203 Tail lps fuse 20a Trans- mission range indicator lamp
POWER DISTRIBUTION Power Distribution Wiring Diagram, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Commercial Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 52 (105a) (diesel a/t-engine harness, approx 19 cm from a/c compresssor clutch relay, others-engine harness, approx 11 cm from steering column connector breakout) s144 (i/p harness, approx 20 cm from fuse block breakout) s204 (others) A/c compressor clutch relay A12 Accessory junction block (left interior bulkhead, near relay bracket) Auxiliary engine coolant fan relay (diesel only) B b8 B c8 B stud Batt bus Battery Battery junction block (left side of engine bulkhead, above relay bracket) Data link connector (dlc) Diesel Dome lamp (provisions for) E2 ecm- bat fuse 20a Eng- bat fuse 15a F7 tail lps fuse 20a Fuel pump relay Fuel pump switch & engine oil pressure gauge sensor Fusible link 10 ga. rust Fusible link 18 ga. rust G7 stop- haz fuse 15a Gas Generator Glow plug control switch (diesel only) Hazard warning lamps flasher Headlamps switch Horn relay Horn/ dm fuse 20a I/p fuse block (dash panel provided by body builder) P b2 P c2 Pwr bus Pwr fuse 30a Red Red (diesel-engine harness, 4-16 cm from starter motor breakout, gasoline-engine harness, 7 cm from generator jumper breakout) s112 Remote battery access terminal block (rear of right radiator core support panel) S134 S206 (i/p harness, approx 12 cm before i/p fuse block breakout) Seat belt/ lamps alarm Secondary battery (diesel only) Starter relay Starter solenoid (at starter, lower right side of engine) Stud To ignition switch (diagram 2 of 4) Torque converter clutch & stoplamps switch Transmission control module (a/t only) Vehicle control module (vcm) W/deluxe school bus (b3m) only Power Distribution Wiring Diagram, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Commercial Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 51 (engine harness, approx 18 cm from right engine breakout) (engine harness, approx 5 cm from right glowplug breakout) s116 (engine harness, approx 6 cm before mass air flow sensor breakout) s116 (i/p harness, approx 15 cm after i/p fuse block breakout) s211 10a A a6 A b6 A c6 A/t Acc Acc bus Acc e5 Automatic transmission (at) Auxiliary engine coolant fan relay Camshaft position (cmp) sensor Clutch pedal position (cpp) switch Crank fuse (engine harness, in-line fuse block near right side of steering column upper support) Crk (start) Diesel Eng-1 fuse 20a Evaporative emissions (evap) canister purge solenoid valve Exhaust gas recirculation (egr) valve Fuel heater Fuel injection pump cold advance solenoid engine coolant temperature (ect) switch Gas Gauges fuse, ecm-1 fuse: (4.3l vin w (l35) engine) (5.7l vin r (l31) engine) (6.5l vin y (l57) engine) Glow plug control switch Heated oxygen sensor (ho2s) left pre- converter Heated oxygen sensor (ho2s) post converter (4.3l vin w (l35) engine) heated oxygen sensor (ho2s) left post converter (5.7l vin r (l31) engine) Heated oxygen sensor (ho2s) right post converter (5.7l vin r (l31) engine) Heated oxygen sensor (ho2s) right pre- converter I/p fuse block (dash panel provided by body builder) Ignition switch Lock M/t Mass air flow (maf) sensor Nca Off On (run) Park/neutral position (pnp) & backup lamps switch Pnk Provisions windshield washer motor Radio fuse 10a Red S139 To i/p fuse block: (diagram 4 of 4) Trans fuse 10a Vehicle control module (vcm) Water- in-fuel indicator sensor Windshield wiper & washer switch Wiper fuse 25a Power Distribution Wiring Diagram, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Commercial Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 22 (engine harness, approx 10 cm from breakout to right side of engine crossover harness) s108 (engine harness, approx 9 cm from right h2os breakout) s108 4.3l vin w (l35) engine 5.7l vin r (l31) engine Crankshaft position (ckp) sensor Crankshaft position sensor (ckp) Ecm-1 fuse 20a Electronic ignition (ei) coil driver module Fuel injector no.1 Fuel injector no.2 Fuel injector no.3 Fuel injector no.4 Fuel injector no.5 Fuel injector no.6 Fuel injector no.7 Fuel injector no.8 Hot in run or start I/p fuse block (dash panel provided by body builder) Ignition coil Instrument cluster Pnk Vehicle control module (vcm) Power Distribution Wiring Diagram, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Commercial Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 52 (engine harness, approx 19 cm pnk (engine harness, approx 26 cm from bulkhead grommet) (gasoline-engine harness, 8 cm from vcm breakout, diesel-engine harness, 13 cm from a/c compressor high pressure cut-off switch breakout) s133 (gasoline) s124 (diesel) (i/p harness, approx 40 cm before i/p fuse block breakout) 105a 1996 vftc c 6.5l vin y (l57) engine A/c compressor clutch relay A/t Back up lamps switch C16 C208 Canadian models only D4 htr fuse 25a d3 Daytime running lamp (drl) relay Daytime running lamps (drl) control module Diesel E4 turn- b/u fuse e3 15a Ecm-1 fuse 20a Electronic brake control module F4 i-3 fuse 15a f3 F6 gauges fuse 20a f5 From breakout to steering column connector) s132 From ignition switch (diagram 2 of 4) Fuel injection pump fuel shut-off solenoid G4 aux fuse 30a g3 Gas Generator Hot in run or start Htr bus I/p fuse block (dash panel provided by body builder) Ign bus Instr- lps fuse 5a Instrument cluster Interior lights system Interior lights system (i/p lamps dimmer switch) M/t Nca Others P/b booster fluid flow alarm Park/ neutral position (pnp) & backup lamps switch Pnk S108 S207 Seat belt alarm This can plug into c4, b4, or a4 Torque converter clutch (tcc) & stop lamps switch Transmission control module (tcm) Turn signal flasher Vehicle control module (vcm) Vehicle speed sensor (vss) buffer W/brake warning indicator system only (uj1) Power Distribution Wiring Diagram, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P30 1997: 54 (7.4l vin n-engine harness, 45 cm frim breakout for engine coolant fan motor, 7.4l vin j-engine harness, 44 cm from breakout for left wheel speed sensor, 6.5l-engine harness, 20 cm from breakout of main harness) (i/p harness, 15 cm from bulkhead connector) (i/p harness, 6 cm from breakout for headlamp switch) 6.5l vin f (l65) engine 6.5l vin f (l65) engine only 7.4l vin j (l29) & 6.5l vin f (l65) engines only 7.4l vin j (l29) engine 7.4l vin n (l19) engine A/c compressor control relay Audio alarm Auxiliary fan control relay Bat Battery Battery junction block (on forward left side of the bulkhead) Blank fuse Buss bar C13 D13 Data link connector (dlc) Diesel Dome lamp E16 E2 ecm- bat fuse 20a Electronic brake control module Eng- bat fuse 15a F7 tail lamps fuse 20a Fuel pump relay Fuel pump switch and oil pressure gauge Fusible link 10 ga. red Fusible link 10 ga. rust G7 stop- haz fuse 15a Generator (on right front of engine) Glow plug controller and relay Hazard flasher Headlamps switch Horn relay Horn/ dm fuse 20a I/p fuse block (mounted on the i/p) Ignition switch (diagram 2 of 4) Park brake pump relay Powertrain control module (pcm) Pwr circuit breaker 30a Red Red a S114 S125 (7.4l vin n-engine harness 4 cm from breakout for cruise control module, 7.4l vin j-engine harness, 5 cm from breakout for egr, 6.5l-engine harness, 9 cm from breakout for generator) S141 S153 S156 (i/p harness, 35 cm from fuse panel) Secondary battery (diesel only) Starter motor (on right rear side of engine) Starter relay Stoplamp switch Vehicle control module (vcm) Power Distribution Wiring Diagram, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P30 1997: 44 (7.4l vin n-engine harness, 30 cm from breakout for cruise control module, 7.4l vin j-engine harness, 11 cm from breakout for egr, 6.5l-engine harness, 12 cm from breakout for glowplug control) s128 (i/p harness, 25 cm from fuse panel) s157 7.4l vin j & 6.5l vin f engines 7.4l vin j (l29) engine 7.4l vin j (l29) engine & 7.4l vin n (l19) engine A6 crank fuse 10a Acc Acc e5 Automatic transmission Auxiliary fan control relay Camshaft position sensor (7.4l vin j (l29) engine) Ecm-1 fuse, & gauges fuse Eng-1 fuse 20a Engine harness, 10 cm from breakout for ignition coil) s133 Evaporative emissions canister purge valve solenoid (7.4l vin j (l29) engine) Exhaust gas recirculation valve solenoid From fusible link (diagram 1 of 4) Fuel heater (6.5l vin f engine) Glow plug controller relay (6.5l vin f engine) Heated oxygen sensor bank 1 sensor 1 Heated oxygen sensor bank 1 sensor 2 Heated oxygen sensor bank 2 sensor 1 Heated oxygen sensor bank 2 sensor 2 I/p fuse block (mounted on i/p fuse block) I/p fuse block (mounted on the i/p) Ignition coil (7.4l vin n engine) Ignition switch Lock Mass air flow sensor (7.4l vin j engine) Nca Off Park/neutral position (pnp) & backup lamps switch (7.4l vin j, & 6.5l vin f engines) Pnk Radio fuse 10a Red Run S201 (pcm/i/p harness, 20 cm from bulkhead grommet in pcm harness) Start Starter motor Trans fuse 10a Vehicle control module Water in-fuel indicator sensor (6.5l vin f engine) Wiper fuse 25a Wiper motor Power Distribution Wiring Diagram, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P30 1997: 32 (7.4l-engine harness, 24 cm pnk from breakout for engine coolant fan motor, 6.5l-engine harness, 16 cm from bulkhead grommet) s121 (engine harness, 28 cm from breakout for injectors) s121 (fuel injector harness, 7 cm from breakout for injector 5) s158 (fuel injector harness, 7 cm from breakout for injector 5) s159 (l19) (l65) 7.4l vin j (l29) engine 7.4l vin n (l19) & 6.5l vin f (l65) engines 7.4l vin n (l19) engine only C11 C12 Crankshaft position sensor E15 Ecm-1 fuse 20a Electronic ignition control module F15 Hot in run & start I/p fuse block (mounted on the i/p) Ignition coil Injector no.1 Injector no.2 Injector no.3 Injector no.4 Injector no.5 Injector no.6 Injector no.7 Injector no.8 Instrument cluster Pnk Powertrain control module (pcm) Vehicle control module (vcm) Vehicle speed sensor buffer Power Distribution Wiring Diagram, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997 List of elements for Power Distribution Wiring Diagram, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P30 1997: 44 (7.4l vin n-engine harness, 59 cm from breakout for engine coolant fan motor, 7.4l vin j-engine harness, 52 cm from breakout for map sensor, 6.5l-engine harness, 33 cm from breakout for windshield wiper switch) s116 (engine harness, 52-58 cm from bulkhead grommet) s115 (engine harness, pnk (i/p harness, 12 cm from breakout for headlamp switch) s154 1996 vftc c 52-58 cm from bulkhead grommet) s115 6.5l vin f (l65) engine only 7.4l vin j & 6.5l vin f (l65) engines only 7.4l vin j (l29) engine 7.4l vin n (l19) & 7.4l vin j (l29) engines A c A/c compressor relay Aux circuit breaker 30a Buss bar C1 (7.4l vin n) c1 (others) Canadian models Cruise control module Cruise control switch D4 htr fuse 25a d3 Daytime running lamps control module Daytime running lamps control relay E4 turn b/u fuse e3 15a F4 i-3 fuse 15a f3 F6 gauges fuse 20a f5 From ignition switch (diagram 2 of 4) Generator H4 instr- lps fuse 5a Hot in run or start I/p auxiliary fuse block (mounted on the i/p fuse block) I/p fuse block (mounted on the i/p) I/p fuse block (mounted on the i/p) Instrument cluster Interior lights system Interior lights system (instrument panel dimmer switch) Nca Park brake low pressure switch Park/neutral position (pnp) & backup switch Pnk Seatbelts/ lamps alarm module Stoplamp torque converter clutch switch Turbo charger power valve solenoid Turn signal flasher Turn signal switch Vehicle control module (vcm)
SHIFT INTERLOCKS Shift Interlock Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Shift Interlock Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 20 (below radiator, on crossmember) electronic brake control module (left interior bulkhead, near relay bracket or body builder installed) g202 Brake Brake/transmission shift interlock (btsi) relay (left interior bulkhead on relay bracket) Brake/transmission shift interlock (btsi) solenoid (on steering column) Diesel Gasoline Hot in run I-3 fuse 15a I/p fuse block Ign Park/neutral position and backup lamps switch (left of trans) S110 S133 (gas) s124 (diesel) S200 (i/p side of eng harn, approx 17 cm from grommet left of bulkhead conn) Torque converter clutch and stop lamps switch (right side of steering column) Trans- mission control module (left interior bulkhead) Turn b/u fuse 15a Turn signal flasher (on fuse block) Vehicle control module (left radiator support) Shift Interlock Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Shift Interlock Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 26 (l19) (l65) (l29/l65) (l19 only) (on crossmember, front of vehicle) electronic brake control module (on fuse block) turn signal flasher (rear of brake support bracket) B a Brake Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket) Brake/transmission shift interlock (btsi) solenoid (on steering column) Cruise control module E13 b9 G202 (left side of i/p) Hot in run I-3 fuse 15a I/p fuse block Ign L19/l65 L29 only Park/neutral position and backup lamp switch (left of trans) Power- train control module (left of driver's island) S200 (i/p harn, 22 cm from grommet under i/p, toward steering column harn) S203 S216 Torque converter clutch and stop lamps switch Turn b/u fuse 15a Vehicle control module (top of radiator support)
STARTING/CHARGING Charging Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for Charging Wiring Diagram for Chevrolet Forward Control P30 1997: 15 (commercial) s112 (motor home) s125 (commercial-rear of right cylinder head, motor home-left frame rail) Battery Fusible link (10 ga-rust) G120 (commercial) g113 (motor home) Gauges fuse 20a Generator Hot in run and start I/p fuse block Pnk Power distribution system Red S207 (commercial) s154 (motor home) Secondary battery (diesel) Starter solenoid Starting Wiring Diagram for Chevrolet Forward Control P30 1997 List of elements for Starting Wiring Diagram for Chevrolet Forward Control P30 1997: 38 (commercial) (commercial-rear of right cylinder head, motor home-left frame rail) (engine harness, approx 33 cm from bulkhead grommet) (left interior bulkhead near relay bracket-commercial chassis diesel, rear of left cyl. head-commercial chassis gasoline, 13 cm from breakout for the ignition coil-motor home vin j) (motor home) 10a A/t Accy Battery Battery junction block Clutch pedal position switch (clutch pedal bracket) Engine controls system (commercial diesel only) Except l19 motor home Fusible link (10 ga-rust) G113 G120 G202 (commercial chassis-diesel) g114 (commercial chassis-gasoline) g117 (motor home-vin j) Hold- in coil Ignition switch In line crank fuse (commercial) or auxiliary fuse block (motor home) L19 motor home only Lock M/t Off P or n Park/neutral position and backup lamps switch (left side of transmission) Pull- in coil Red Red b Run S109 S110 (commercial diesel) s118 (commercial gasoline) s135 (motor home) S112 (commercial) s125 (motor home) Secondary battery (diesel) Start Starter motor Starter relay (under battery junction block) Starter solenoid
TRANSMISSION
4.3L 4.3L (VIN W), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 4.3L (VIN W), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 72 (mil) 1-2 shift 1-2 shift sol 2-3 shift sol 2-3 shift solenoid 5v reference A/c compressor clutch relay, drl control module, drl relay, generator, & seat belt/ lamps alarm A/t input speed sensor (left side of transmission) A/t iss hi in A/t iss lo in Accessory power point Automatic transmission (4l80-e) Battery in Brake switch input Cmp sensor, egr valve solenoid, evap canister purge valve solenoid, heated oxygen sensors & maf sensor Dash fuse block Data class ii Data link connector (partial) (below dash near steering column) Ecm batt fuse 20a Ecm-i fuse 20a Ect sens input Electronic brake control module Eng 1 fuse 20a Engine coolant temperature sensor (top front of engine) Fuel injectors (enigine controls sysytem) Fuel pump relay & fuel pump switch/engine oil pressure gauge sensor G110 (thermostat housing) G125 (on thermostat housing) Gauges fuse 20a Hot at all times Hot in run Hot in run or start I-3 fuse 15a Ignition in Instrument cluster Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Press ctrl Range signal "a" Range signal "b" Range signal "c" Red S108 S116 S119 (engine harness, 11 cm from ect-a/c clutch break-out) S133 S134 S138 S143 S200 (engine harness, on dash side near ignition switch) S207 Sensor ground Sensor return Service engine soon indicator Solenoid Tcc pwm Tcc pwm sol Tcc/stop- lamp switch (on brake pedal bracket) Throttle position sensor (mounted to side of throttle body) Tp sens input Trans fluid temp sensor Trans fuse 10a Trans range pressure switch assembly Trans temp sig in Vehicle control module (left front corner of engine compt) Vehicle speed sensor (left rear of transmission) Vss hi Vss lo Vss sensor shield
5.7L 5.7L (VIN R), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 5.7L (VIN R), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 72 (mil) 1-2 shift 1-2 shift sol 2-3 shift sol 2-3 shift solenoid 5v reference A/c compressor clutch relay, drl control module, drl relay, generator, & seat belt/ lamps alarm A/t input speed sensor (left side of transmission) A/t iss hi in A/t iss lo in Accessory power point Automatic transmission (4l80-e) Battery in Brake switch input Cmp sensor, egr valve solenoid, evap canister purge valve solenoid, heated oxygen sensors & maf sensor Dash fuse block Data class ii Data link connector (partial) (below dash near steering column) Ecm batt fuse 20a Ecm-i fuse 20a Ect sens input Electronic brake control module Eng 1 fuse 20a Engine coolant temperature sensor (top front of engine) Fuel injectors (enigine controls sysytem) Fuel pump relay & fuel pump switch/engine oil pressure gauge sensor G110 (thermostat housing) G125 (on thermostat housing) Gauges fuse 20a Hot at all times Hot in run Hot in run or start I-3 fuse 15a Ignition in Instrument cluster Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Press ctrl Range signal "a" Range signal "b" Range signal "c" Red S108 S116 S119 (engine harness, 11 cm from ect-a/c clutch break-out) S133 S134 S138 S143 S200 (engine harness, on dash side near ignition switch) S207 Sensor ground Sensor return Service engine soon indicator Solenoid Tcc pwm Tcc pwm sol Tcc/stop- lamp switch (on brake pedal bracket) Throttle position sensor (mounted to side of throttle body) Tp sens input Trans fluid temp sensor Trans fuse 10a Trans range pressure switch assembly Trans temp sig in Vehicle control module (left front corner of engine compt) Vehicle speed sensor (left rear of transmission) Vss hi Vss lo Vss sensor shield
6.5L 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 87 (engine harn, 2 cm from wiper motor break-out) (rear lamps provision connector) 1-2 shift 1-2 shift sol 2-3 shift sol 2-3 shift solenoid 3-2 shift 3-2 shift sol A/c compressor relay & generator A/t input speed sensor (left side of transmission) A/t iss sens hi in A/t iss sens lo in A12 Accelerator pedal position module (attached to accelerator pedal) Anti-lock brakes & cruise control systems App 1 5v ref App 1 signal in App 2 5v ref App 2 signal in App 3 5v ref App 3 signal in Automatic transmission (4l80-e) B10 B12 Battery in Brake switch in Buss bar C11 C12 C13 C14 C15 Class ii data D11 D12 D13 Dash fuse block Data link connector (partial) (below dash, near steering column) Ecm bat fuse 20a Ecm-1 fuse 20a Ect sensor in Engine coolant temperature sensor (top front of engine) Fuel injectors (engine controls) Fuel pump relay & switch Gauges fuse 20a Hazard lamps flasher (above steering column) Hot at all times Hot in run Hot in run or start I-3 fuse 15a Ignition in Indicator Instrument cluster Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Powertrain control module (behind left side of dash) Press ctrl solenoid Red S114 S116 S119 (engine harn, 4 cm from glow plug controller break-out) S121 S124 (engine harn, 16 cm from p100) S126 S154 S200 (dash harn, 8 cm from breakout to steering column) Sensor ground Service engine soon (mil) Solenoid Stop lamps & torque converter brake switch Stop-haz fuse 15a Stoplamp switch in Tft sensor in Trans fluid temp sensor Trans fuse 10a Trans range "a" Trans range "b" Trans range "c" Trans range pressure switch assembly Vehicle speed sensor (left rear of transmission) Vehicle speed sensor buffer (above accelerator pedal) Vss hi in Vss lo in Vss out 6.5L (VIN Y), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 6.5L (VIN Y), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 87 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 5 volts ref 5v in 5v rtn A/t input speed sensor (left front side of transmission) A10 A11 A12 Automatic transmission (4l80-e) B10 B11 B12 Baro sensor input Barometric pressure sensor (top left rear of intake manifold) Battery feed Brake signal C10 C11 C12 C13 C14 C15 C16 D10 D11 D12 D13 D14 D15 D16 Dash fuse block Data link connector (partial) (below dash, near steering column) Diagnostic test Ecm bat fuse 20a Ecm-1 fuse 20a Engine speed sensor (in fuel injection pump) Engine speed signal G114 (rear of left cylinder head) Hot at all times Hot in run Hot in run or start I-3 fuse 15a Ignition Input speed sens hi Input speed sens lo Instrument cluster Out Pcs hi Pcs lo Pnk Pnk n Pressure control solenoid Range mode selector Range signal a Range signal b Range signal c Red Red p S108 S111 (engine harn, 10 cm from generator breakout) S119 (engine harn, 6 cm from glow plug switch breakout) S143 S200 (engine harn, near ignition switch) Sensor ground Serial data Service trans output Service transmission indicator Stop lamps & torque converter brake switch System ground Tan Tcc pwm control Tcc pwm sol Throttle position sensor (right side of fuel injection pump) Tp sensor input Trans fluid temp sig Trans fuse 10a Transmission control module (left interior firewall) Transmission temperature sensor Vehicle spd output Vehicle speed input Vehicle speed sensor (left rear of transmission) Vehicle speed sensor buffer Vehicle speed sensor buffer & fuel injection pump fuel shut off solenoid Vss inputs
7.4L 7.4L (VIN J), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN J), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 71 (a/t output speed sensor) (mil) (twisted wire pair) 1-2 shift 1-2 shift sol 2-3 shift sol 2-3 shift solenoid 5v reference A/c compressor relay, generator & seat belt/ headlamp alarm module A/t input speed sensor (left side of transmission) A/t iss hi in A/t iss lo in Automatic transmission (4l80-e) Battery in Brake switch input Buss bar Cooling fans & engine controls systems Cruise control module & switch Dash fuse block Data class ii Data link connector (partial) (below dash, near steering column) Ecm bat fuse 20a Ecm-1 fuse 20a Ect sens input Eng-1 fuse 20a Engine coolant temperture sensor (top front of engine) Fuel injectors (engine controls system) Fuel pump relay & switch G120 (10 cm from breakout for generator) Gauges fuse 20a Hot at all times Hot in run Hot in run or start I-3 fuse 15a Ignition in Instrument cluster Mil control Pcm ground Pcs sol hi out Pcs sol lo out Pnk Press ctrl Range signal "a" Range signal "b" Range signal "c" Red S114 S116 S119 (engine harness, 4 cm from breakout to generator) S121 S126 S128 S154 S200 (eng harn, 45 cm from breakout to map sensor) Sensor ground Sensor return Service engine soon indicator Solenoid Stop lamps & torque converter clutch switch Tcc pwm Tcc pwm sol Throttle position sensor (on throttle body) Tp sens input Trans fluid temp sensor Trans fuse 10a Trans range pressure switch assembly Trans temp sig in Vehicle control module (center front of engine compt) Vehicle speed sensor (left rear of transmission) Vss hi Vss lo 7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997 List of elements for 7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for Chevrolet Forward Control P30 1997: 86 (engine harn, 4 cm from generator breakout) (engine harness, 4 cm from coolant fan motor breakout) (engine) (18 cm from breakout for chassis harness) (mil) 1-2 shift sol 1-2 shift sol ctrl 2-3 shift sol 2-3 shift sol ctrl 5v reference A/c compressor, drl module, drl relay, generator, instrument cluster & seat belt/headlamp alarm module A/t input speed sensor (left side of transmission) A1 a1 A14 A15 All times Anti-lock brakes & cruise control systems Automatic transmission (4l80-e) Battery feed Brake sig Buss bar Dash fuse block Data link connector (partial) (below dash, near steering column) Diagnostic test E11 E13 E15 E16 Ecm bat fuse 20a Ecm-i fuse 20a Ect sig Engine controls systems Engine coolant temperature sensor (top front of engine) F10 F12 F13 F14 F15 Fuel injectors (engine controls) Fuel pump relay & switch Gauges fuse 20a Hot at Hot in run Hot in run or start Hot in run, bulb I-3 fuse 15a Ignition feed Instrument cluster Mil control Or start Pcm ground Pnk Powertrain control module (left side of dash) Pressure control hi Pressure control lo Pressure control sol Range mode selector Range signal "a" Range signal "b" Range signal "c" Red S114 S116 S118 S119 S121 S126 S154 S200 (i/p harness, under instrument cluster) Sensor ground Serial data Service engine soon indicator Stop lamps & torque converter brake switch Tan Tcc Tcc pwm sol Test or start Throttle position sensor (on side of throttle body) Tp signal Trans fluid temp sensor Trans fluid temp sig Trans fuse 10a Trans input speed Vehicle speed sensor (left rear side of transmission) Vehicle speed sensor buffer (above accelerator pedal) Vss signal hi in Vss signal lo in
WARNING SYSTEMS Warning System Wiring Diagrams, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Warning System Wiring Diagrams, Commercial Chassis for Chevrolet Forward Control P30 1997: 30 (left interior bulkhead, near relay bracket) Dash lamps Diesel Fasten belts lamp G114 (a/t) (rear of left cylinder head) G119 (m/t) (generator bracket) G131 (thermostat housing) G202 (body builder instld) Gas Gauges fuse 20a Ground Horn dm fuse 20a Hot at all times Hot in park or head Hot in run or start I/p fuse block Instrument cluster Instrument lps fuse 5a Pnk Power (battery) Power (ignition) S143 S143 (a/t) s118 (m/t) S204 S205 S207 S209 Seat belt input Seat belt lamp output Seat belt/lamps alarm (i/p fuse block) Warning System Wiring Diagrams, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Warning System Wiring Diagrams, Motor Home Chassis for Chevrolet Forward Control P30 1997: 21 G202 (left side of i/p) Gauges fuse 20a Ground Horn dm fuse 20a Hot at all times Hot in park or head Hot in run I/p fuse block Instr lps fuse 5a Instrument cluster Lamp on input Pnk Power (battery) Power (ignition) S150 S153 S154 S155 Seatbelt switch Seatbelt tell tale Seatbelt/lamps alarm module (i/p fuse block)
WIPER/WASHER Provisions For Front Wiper/Washer Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997 List of elements for Provisions For Front Wiper/Washer Wiring Diagram, Commercial Chassis for Chevrolet Forward Control P30 1997: 13 (1996-97) (1998-99) (first breakout from bulkhead connector) High Hot in accy or run I/p fuse block Low Mist Off Pnk Provisions for wiper/washer motor Wash Windshield wiper and washer switch Wiper fuse wiper fuse 14 25a Provisions For Front Wiper/Washer Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997 List of elements for Provisions For Front Wiper/Washer Wiring Diagram, Motor Home Chassis for Chevrolet Forward Control P30 1997: 20 (1996-97,1999) s150 (1998) s203 (1998-99) g202 (left side of dash) 1996-97 1998/ Delay rheo- stat G202 (1996-97) (on driver's island) High Hot in accy and run I/p fuse block Low Mist Off Pnk Provisions for wiper/washer motor Pulse Pulse wiper control module (strapped to harness under driver's island) Wash Wiper fuse 14 25a Wiper fuse 25a Wiper/ washer switch
