ENGINE PERFORMANCE – Chevrolet Forward Control P30 1997 – SYSTEM WIRING DIAGRAMS

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:

• (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:

• (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:

• (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:

• (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:

• 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:

• (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:

• (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:

• (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:

• (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:

• 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:

• (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:

• "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:

• (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:

• 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:

• (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:

• (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:

• (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:

• (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:

• (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:

• (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:

• (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:

• (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:

• (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:

• (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)