ENGINE PERFORMANCE – Chevrolet Forward Control P12 1998 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

4.3L

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P12 1998

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P12 1998:

• (on throttle body assembly) idle air control (iac) valve
• (right front of engine at crankshaft balancer pulley)
• (thermostat housing) g125
• (top right side of engine) evaporative emissions (evap) canister purge solenoid valve
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 3x ckp sens sig
• A pnk
• Anti- lock brake system
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position (cmp) sensor (in distributor)
• Ckp sens rtn
• Crankshaft position (ckp) sensor
• Ect sensor input
• Egr posit input
• Evaporative emissions (evap) canister vent solenoid valve (left side of canister bracket)
• 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
• Fuel lev
• G114 (rear of left cylinder head)
• Hall effect sensor
• Heated oxygen sensor bank 1, sensor 1 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 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
• Pnk pnk pnk
• Power
• Purge vent ctrl
• S138
• S139
• S140
• S143
• System ground
• Tan
• Tank press sens
• Tank pressure sensor (top of fuel tank)
• Tcc pwm sol ctrl
• Tft sig
• Throttle position sens
• Vehicle control module (vcm) (on left side of engine compartment)
• Vehicle speed out
• 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 P12 1998

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P12 1998:

• (rear of left cylinder head) g114
• (top front of engine) exhaust gas recirculation (egr) valve
• 1-2 shift solenoid
• 2-3 shift solenoid
• Automatic transmission (a/t) (if equipped) (rear of engine)
• Ecm 2 fuse 12 20a
• Eng 1 fuse 15 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 bank 2, sensor 1 (right exhaust pipe ahead of catalytic converter)
• Heated oxygen sensor, bank 1 sensor 2 (exhaust pipe behind catalytic converter)
• Hot in run & start
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Nca
• Pnk
• Pnk d
• Pnk n
• Pressure control solenoid (pcs)
• Red
• Red p
• Rev
• S108
• S116
• S118
• S145
• Tan
• Tan a
• Tcc pwm solenoid
• Trans fuse 17 10a
• Transmission fluid temperature (tft) sensor
• Transmission range (tr) pressure switch assembly

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P12 1998

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P12 1998:

• (eng harn, approx 13cm from tps breakout)
• (eng harn, approx 8cm from ect sensor breakout)
• (eng harn, approx 8cm from tps breakout) s136
• (engine harn, 7 cm from ebcm 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 10 15a
• Engine coolant temperature (ect) sensor (top front of engine)
• 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)
• G114 (rear of left cylinder head)
• Gauges fuse 8 10a
• Hot at all times
• Hot in run & start
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Instrument cluster
• Intake air temperature (iat) sensor (mounted in fresh air intake, behind filter box)
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (top rear of engine)
• Map
• Mass air flow sensor (maf) (mounted in fresh air intake, behind air filter box)
• Nca
• Oil press gauge
• Pnk
• Pnk pnk pnk
• R100 (1100 ohms .75 watts)
• Red
• Ref lo
• S119 (eng harn, approx 11cm from ect sensor breakout)
• S135
• S137
• S138
• S142 (eng harn, approx 23cm from maf sensor breakout)
• S144
• S145
• S207
• S218
• S406
• Speedo meter
• Tacho meter
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (on throttle body, top of engine)

4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P12 1998

List of elements for 4.3L (VIN W), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P12 1998:

• (i/p harn, 17 17 cm from breakout to bulkhead conn)
• (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)
• (rear of left cylinder head) g114
• 5v ref
• 5v return
• 87a
• A/c request sig
• A/c system
• A/t input speed sensor (transmission, left front)
• Anti-lock brakes 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) (below dash, near steering column)
• Distributor (top rear of engine)
• Ecm b fuse 6 20a
• Egr valve ctrl
• Evap can purge ctrl
• Feed ignition
• Fuel level
• Fuel pump prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (on fire- wall, under battery junction block)
• Fuel pump rly ctrl
• G114
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I-3 fuse 9 15a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Ignition coil (top right side of engine)
• Ignition control module (right top of engine)
• Input spd sens rtn
• Input spd sens sig
• Mil ctrl
• Pcs sol (hi)
• Pcs sol (lo)
• Pnk
• Pnk a
• Pressure switch in
• Range sig "a"
• Range sig "b"
• Range sig "c"
• Red
• Relay ctrl
• Return control
• S133
• S134
• S138
• S143
• S150
• S200
• Serial data
• Shift interlock system
• Signal control timing
• Spark plugs
• System ground
• Tcc/stop lamps switch (right side of steering column upper support)
• Timing ctrl sig
• Vehicle control module (vcm) (left side of engine compartment)
• Vss output

5.7L

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P12 1998

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (1 of 4) for Chevrolet Forward Control P12 1998:

• (left side of air intake system) idle air control (iac) valve
• (right center of intake manifold) evaporative emissions (evap) canister purge solenoid valve
• (right front of engine at crankshaft balancer pulley) crankshaft position sensor (ckp)
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 4x ckp sens sig
• A pnk
• Anti-lock brake system
• C pnk
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position (cmp) sensor (in distributor)
• Ckp sens rtn
• Ect sensor in
• Egr posit in
• Evaporative emissions (evap) canister vent solenoid valve (left side of canister bracket)
• 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
• Fuel lev signal
• G114 (rear of left cylinder head)
• Hall effect sensor
• Heated oxygen sensor, bank 1 sensor 2 (left exhaust pipe ahead of catalytic converter)
• Heated oxygen sensor, bank 2 sensor 1 (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 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) (lower right side of engine)
• Map sensor in
• Mass air flow in
• Nca
• Pnk
• Pnk d
• Pnk pnk
• Pnk pnk pnk
• Power
• Purge vent
• S138
• S139
• S140
• Tan
• Tan a
• Tank pressure
• Tank pressure sensor (top of fuel tank)
• Tcc pwm sol ctrl
• Tft sig
• Throttle posit sens
• Vehicle control module (vcm) (left side of engine compt)
• Vehicle speed out
• 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 P12 1998

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (2 of 4) for Chevrolet Forward Control P12 1998:

• (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 12 20a
• Eng 1 fuse 15 20a
• Exhaust gas recirculation (egr) solenoid valve (front left top of intake manifold)
• Fuel injector
• Heated oxygen sensor, bank 1 sensor 2 (left exhaust pipe behind catalytic converter)
• Heated oxygen sensor, bank 2 sensor 2 (right exhaust pipe behind catalytic converter)
• Hot in run & start
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Nca
• Pnk
• Pnk d
• Pnk n
• Pressure control solenoid (pcs)
• Red
• Red p
• Rev
• S108
• S116
• S118
• S145
• Tan
• Tan a
• Tcc pwm solenoid
• Transmission fluid temperature sensor
• Transmission range (tr) pressure switch assembly

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P12 1998

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (3 of 4) for Chevrolet Forward Control P12 1998:

• (eng harn, approx 30cm from maf sensor breakout)
• (eng harn, approx 8cm from ect sensor breakout) s135
• (eng harn, approx 8cm from tp sensor breakout)
• (rear of left cylinder head) g114
• (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-b fuse 10 15a
• Engine coolant temperature (ect) sensor (top front of engine)
• 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)
• Gauges fuse 8 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 (in fresh air intake, behind air filter box)
• Manifold absolute pressure (map) sensor (top right rear of engine)
• Map
• Mass air flow (maf) sensor (in fresh air intake behind air filter box)
• Nca
• Oil press gauge
• Pnk
• R100 (1100 ohms .75 watts)
• Red
• Ref lo
• S119 (eng harn, approx 4cm from ect sensor breakout)
• S136
• S137 (eng harn, approx 12cm from tp sensor breakout)
• S138
• S142
• S144
• S145
• S207
• S218
• Service engine soon indicator
• Speedo meter
• Tacho meter
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (throttle body, top of engine)
• Trans fuse 17 10a

5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P12 1998

List of elements for 5.7L (VIN R), Engine Performance Wiring Diagrams, Commercial Chassis (4 of 4) for Chevrolet Forward Control P12 1998:

• (below dash,
• (i/p harn, above steering column)
• (i/p side of eng harn, approx 19cm from left bulkhead grommet)
• (left interior bulkhead near relay bracket) (body builder installed) g202
• (rear of left cylinder head)
• (rear of left cylinder head) g114
• 5v ref
• 5v rtn
• 87a
• A/c compressor enable
• A/c request sig
• A/c sw in
• A/c system
• A/t input speed sensor (transmission, left front)
• Anti-lock brake system
• Brake sig
• Clutch pedal position switch (top of clutch pedal support)
• Clutch sig
• Cylinder 1
• Cylinder 2
• Cylinder 3
• Cylinder 4
• Cylinder 5
• Cylinder 6
• Cylinder 7
• Cylinder 8
• Data link connector (dlc)
• Distributor (top rear of engine)
• Ecm-b fuse 6 20a
• Egr ctrl
• Evap canp valve driver
• Fuel lev
• 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
• G114
• Gnd
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I-3 fuse 9 15a
• I/p fuse block (dash panel provided by body builder) (body builder installed)
• Ign feed
• Ignition coil (top right side of engine)
• Ignition control module (bracket at top edge of right cylinder head)
• Ignition feed
• Input spd sens rtn
• Input spd sens sig
• Mil ctrl
• Near steering column)
• Pcs sol (hi)
• Pcs sol (lo)
• Pnk
• Pnk a
• Range sig "a"
• Range sig "b"
• Range sig "c"
• Red
• S110
• S133
• S134
• S138
• S143
• S150
• S200
• Serial data
• Shift interlock system
• Spark plugs
• System gnd
• Tcc/ stop lamps switch (right side of steering column upper support)
• Timing control return
• Timing control signal
• Timing ctrl sig
• Vehicle control module (vcm) (left side of engine compt)
• Vss output

6.5L

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P12 1998:

• (eng harn, 16 cm from battery jb stud d)
• (eng harn, 21 cm from left firewall grommet)
• (eng harn, 4 cm from glow plug controller breakout)
• (left rear of engine block) g114
• (lower left front of engine) crankshaft position sensor
• (on top right center of engine) boost pressure sensor
• (top of engine, in air intake) intake air temperature sensor
• (top right front of engine) engine coolant temperature sensor
• 1-2 shift solenoid valve
• 2-3 shift solenoid valve
• A/c request sig
• A10
• A11
• A12
• Antilock brakes system
• App 1 5 volt ref
• App 1 ground
• App 1 sig
• App 2 ground
• App 2 sig
• App 3 5 volt ref
• App 3 grd
• App 3 sig
• Automatic transmission
• Automatic transmission input shaft speed sensor (left side of transmission)
• B10
• B11
• B12
• Battery
• Boost and ckp 5 volt ref
• Boost sensor sig
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Camshaft posit sens
• Ckp sens input
• Closure gnd
• Closure signal
• Criuse set/coast sig
• Cruise on/off sig
• Cruise resume/acc req
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Ect signal
• Fuel lift pump sig
• Fuel pump rly ctrl
• Fuel temp grd
• Fuel temp sig
• Glow plug relay ctrl
• Glow plug sig
• Ground
• High res sig
• Iat sig
• Ignition
• On/off
• Oss high
• Oss low
• Oss sig
• Output shaft speed sensor
• Pnk
• Powertrain control module (pcm) (left side of driver's island)
• Press ctrl sol vlv hi
• Press ctrl sol vlv lo
• Pressure control solenoid valve
• Pump cam 5 volt ref
• Range mode selector
• Red
• Resume
• S119
• S160
• S163
• S166
• Sensor gnd
• Set
• Solid state
• Speed control switch
• Stoplamp switch
• Tan
• Tcc pwm solenoid valve
• Tcc/abs brake sw
• Tft sensor
• Timing stepper mtr (high)
• Timing stepper mtr (low)
• Tr switch a
• Tr switch b
• Tr switch c
• Trans input speed sig
• Transmission speed input
• Transmission temperature sensor
• Vehicle speed sensor buffer (on left side of interior bulkhead, mounted under bracket)
• Vss out
• Vss signal

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P12 1998:

• (at rear of brake pedal support bracket)
• 5 volt ref
• Accelerator pedal position module (attached to accelerator pedal)
• App 1 sensor
• App 2 sensor
• App 3 sensor
• B fuel sol ctrl
• B pump cam sig
• Brake transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island)
• C closure grd
• C high res sig
• Closure signal
• D ignition
• D sensor ground
• Engine shutoff solenoid
• F4 i-3 fuse 9 15a f3
• Fuel sol high
• Fuel sol low
• Fuel sole- noid
• Fuel solenoid driver (top left of engine)
• G6 ecm-1 fuse 12 20a g5
• Haz fuse 11 15a
• Hazard flasher (inner left side of main support bracket)
• High
• Hot at all times
• Hot in run
• Hot in run and start
• I/p fuse block
• Ignition timing stepper motor (part of fuel injection pump)
• J6 trans fuse 17 10a j5
• Low
• Optical fuel temperature sensor (part of fuel injection pump)
• Pnk
• Red
• S116
• S121
• S124 (eng harn, 16 cm from left bulkhead grommet toward pcm)
• S200 (i/p harn, 8 cm from breakout for steering column)
• Stop/ g7
• Tcc/ stoplamp switch

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P12 1998:

• (17 cm from rear/lamp harness) g415
• (18 cm from breakout for left glow plugs) g112
• (18 cm from breakout for left glow plugs) g112
• 87a
• A/c compressor clutch relay (right side of driver's island)
• A/c high pressure cut-off switch (on rear of the a/c compressor)
• Ecm-b fuse 6 20a
• Eng bat fuse 10 15a
• Fuel lift pump (inside right frame rail, ahead of fuel tank)
• Fuel pump prime connector
• Fuel pump relay (in underhood fuse/relay center)
• Fuel pump switch and engine oil pressure gauge switch (left rear of engine)
• G114 (rear of left cyl head)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run and start
• I/p fuse block
• Instrument cluster
• Malfunction indicator lamp (mil)
• Nca
• Oil press gauge
• Pnk
• Red
• S114
• S115
• S126
• S132
• S140 (eng harn, 35 cm from pcm conns, toward left firewall grommet)
• S141
• S143
• S154
• S168
• S400
• Service throttle soon indicator
• Speed meter
• Tan
• Wait to start indicator
• Water in fuel indicator
• Water in-fuel indicator sensor (part of fuel/water separator (filter) rear of intake manifold)
• Water in-fuel input

6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P12 1998:

• "serv throttle soon" ind
• (dlc) (partial) (below dash, near steering column)
• (eng harn, 21 cm from breakout for generator) s144
• (eng harn, 7 cm from main harn in breakout for glowplugs) s145
• A/c enable
• Antilock brakes system
• App 2 5 volt ref
• Battery
• Breakout) s200
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector
• Eng-1 h6
• Eso ctrl
• Eso solenoid ctlr
• Fuel heater (top rear of engine)
• Fuel inject ctrl
• Fuse 15 20a
• Fusible link
• Fusible links
• G114 (left rear of engine block)
• G202 (left side of dash)
• Glow plug 1
• Glow plug 2
• Glow plug 3
• Glow plug 4
• Glow plug 5
• Glow plug 6
• Glow plug 7
• Glow plug 8
• Glow plug out
• Glow plug relay (top rear of intake manifold)
• Ground
• Hot at all times
• Hot in run and start
• I/p fuse block
• Ignition
• Mil ind ctrl
• Nca
• Pnk
• Powertrain control module (pcm) (left side of driver's island)
• Red
• Relay ctrl
• S128
• S135
• S163 (eng harn, 21 cm from left fire- wall grommet toward pcm)
• S166
• S203
• Serial data sig
• Shift sol 1-2 input
• Shift sol 2-3 input
• Tcc pwm sol vlv ctrl
• Wait to start ind ctrl
• Wastegate sol ctrl
• Wastegate solenoid

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (1 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (1 of 4) for Chevrolet Forward Control P12 1998:

• (a/t) (rear of left cylinder head)
• (center rear of intake manifold) manifold absolute pressure sensor
• (eng harn, 4cm from breakout to glowplug controller)
• (eng harn, at battery junction block)
• (eng harn, near left bulkhead grommet)
• (front of engine, in air intake) intake air temperature sensor
• (left front side of left cyl head) engine coolant temperature sensor
• (lower left front of engine) crankshaft position sensor
• (m/t) (on generator bracket)
• 12v
• 3-2 shift sol
• 5v ref volt
• A/c request sig
• A/t input speed sensor (left side of transmission)
• A10
• A11
• A12
• Air conditioning
• App no.1 gnd
• App no.1 ref volt
• App no.1 sig
• App no.2 gnd
• App no.2 sig
• App no.3 gnd
• App no.3 ref volt
• App no.3 sig
• Automatic transmission (a/t)
• 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
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Ebcm
• Ect temp sens in
• Electronic brake control module (below radiator, on crossmember)
• Engine crank sens input
• 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)
• G114
• Glow plug "wait" lp out
• Glow plug relay
• Ground
• Intake air temp sens
• Map sensor
• Pcs low
• Pnk
• Powertrain control module (pcm) (left side of driver's island)
• Range mode sel a
• Range mode sel b
• Range mode sel c
• Range mode selector
• Red
• S119
• S143
• S160
• S162
• Second vss sig
• Sensor gnd
• Shift sol a
• Shift sol b
• Solid state
• Speed sensor hi
• Speed sensor lo
• Tan
• Timing stepper mtr (high)
• Timing stepper mtr (low)
• Transmission speed input
• Transmission temp input
• Transmission temperature sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (on driver's island support above accelerator pedal)
• Vss hi
• Vss lo
• Vss rtn
• Vss sig

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (2 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (2 of 4) for Chevrolet Forward Control P12 1998:

• Accelerator pedal position module (attached to accelerator pedal)
• 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)
• Engine shutoff solenoid
• F4 i-3 fuse 9 15a f3
• Fuel sole- noid
• Fuel solenoid driver
• Fuel temp.
• G6 ecm-1 fuse 12 20a g5
• Haz fuse 11 15a
• Hazard lamps flasher (behind left side of dash, above steering column)
• High
• Hot in run
• Hot in run or start
• I/p fuse block (behind dash panel, body builder installed)
• Injection pump (top front of engine)
• J6 trans fuse 17 10a j5
• Low
• Optical 3 temperature sensor
• Pnk
• Red
• S108
• S116
• S124 (eng harn, 13cm from breakout to a/c cutoff switch)
• S200 (dash side of engine harn, 15cm from bulkhead grommet)
• Stop lamps & torque converter brake switch (opens w/brake pedal depressed) (at rear of brake pedal support bracket)
• Stop- g7
• Stoplamp switch (at rear of brake pedal support bracket)
• Timing stepper motor

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (3 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (3 of 4) for Chevrolet Forward Control P12 1998:

• (a/t) (rear of left cylinder head)
• (m/t) (on generator bracket)
• (tail & stoplamp extension harn, at crossmember in front of fuel tank) g415
• 87a
• Ecm- bat fuse 6 20a
• Fuel lift pump (inside left frame rail, below driver's door)
• Fuel pump oil pressure indicator switch (left rear of engine)
• Fuel pump relay (under battery junction box)
• G114
• Gauges fuse 8 20a
• Hot at all times
• Hot in run or start
• I/p fuse block (behind dash panel, body builder installed)
• In line to fuel pump prime (plant use)
• Instrument cluster
• Oil press gauge
• Pnk
• Red
• S118
• S170
• S171 (eng harn, 50cm from breakout to elctronic brake control module)
• S207
• S406
• Service engine soon indicator
• Service throttle soon indicator
• Speed meter
• Tan
• Wait to start "glow plugs" indicator
• Water in fuel indicator

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (4 of 4) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (4 of 4) for Chevrolet Forward Control P12 1998:

• "serv eng soon" ind
• "serv throttle soon" ind
• (a/t) (rear of left cylinder head)
• (at fuel filter assembly) fuel heater
• (eng harn, 21cm from breakout to generator) s144
• (eng harn, 21cm from breakout to generator) s145
• (left rear of engine near firewall) glow plug control module
• (m/t) (on generator bracket)
• (part of fuel/water seperator (filter), rear of intake manifold) water in fuel indicator sensor
• 12v battery (fused)
• 12v battery fused
• 3/2 ctrl out
• A/c enable
• Air conditioning
• App no.2 ref voltage
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (below dash, near steering column)
• Electronic brake control module (below radiator, on first crossmember)
• Eng-1 h6
• Engine shutoff sol out
• Fuel sol module (5 vref)
• Fuel sol module feed
• Fuse 15 20a
• Fusible links
• G114
• Hot at all times
• Hot in run or start
• I/p fuse block (behind dash panel, body builder installed)
• Ignition
• Left bank glow banks
• Nca
• Pcm gnd
• Pnk
• Powertrain control module (pcm) (left side of driver's island)
• Red
• Right bank glow banks
• S116
• S118
• S143
• S150 (dash harn, near steering column upper support)
• S163 (eng harn, 21cm from breakout to left bulkhead grommet)
• Serial data sig
• Shift sol a input
• Shift sol b input

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (1 of 3) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (1 of 3) for Chevrolet Forward Control P12 1998:

• (eng harn, approx 6cm from breakout to glowplug control switch)
• (left side of trans) a/t input speeed sensor
• (rear of left cylinder head) g114
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 5v ref
• A10
• A11
• A12
• A6 a8
• B10
• B11
• B12
• Baro press sens sig
• Barometric pressure (baro) sensor (top left rear of intake manifold)
• Battery feed
• Brake pedal sw in
• Brake/transmission shift interlock relay (on top of driver's island support bracket)
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (partial) (below dash, near steering column)
• Ebcm
• Ecm-1 fuse 12 20a
• Ecm-bat fuse 6 20a
• Electronic brake control module (below radiator, on first crossmember)
• Eng speed sens in
• Engine speed sensor (top front of engine, in fuel injection pump)
• G114 (rear of left cylinder head)
• Ground
• Hot at all times
• Hot in run
• Hot in run or start
• I-3 fuse 9 15a
• I/p fuse block (behind dash panel) (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
• S108
• S111 (eng harn, approx 10cm from breakout to generator jumper)
• S116
• S119
• S143
• S170
• S200 (dash side of eng harn, approx 15cm from left bulkhead grommet)
• Sensor return
• Serial data
• Service trans out
• Sig sensor
• Speed 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 sensor (vss) (left side of trans)
• Vehicle speed sensor (vss) buffer (on driver's island support, above accelerator pedal)
• Vehicle speed sig
• Vss
• Vss input
• Vss out
• Vss rtn
• Vss sig

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (2 of 3) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (2 of 3) for Chevrolet Forward Control P12 1998:

• "wait to start" glow plugs
• (a/t - rear of left cyl head) (m/t - on generator bracket)
• (taped to fuel pump relay breakout) fuel pump prime connector
• 1-2 shift solenoid
• 2-3 shift solenoid
• Automatic transmission (a/t) (rear of engine)
• Ecm-1 fuse 12 20a
• Ecm-bat fuse 6 20a
• Engine oil pressure gauge sensor (on top left rear of eng block)
• Fuel injection pump fuel shutoff solenoid (at fuel injection pump)
• Fuel pump motor
• Fuel pump relay (on engine firewall bracket, under battery junction block)
• G114
• G114 (rear of left cylinder head)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run
• Hot in run or start
• I/p fuse block (behind dash panel) (body builder installed)
• Instrument cluster
• Oil gauge
• Orn
• Pnk
• Pressure control solenoid
• Red
• S108
• S118
• S143
• S170
• S171
• S207
• Service trans
• Speedo meter
• Tan
• Tcc pwm solenoid
• Trans fuse 17 10a
• Transmission fluid temperature (tft) sensor
• Transmission range (tr) pressure switch assembly
• Water in- fuel

6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (3 of 3) for Chevrolet Forward Control P12 1998

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (3 of 3) for Chevrolet Forward Control P12 1998:

• (a/t) (m/t) (on generator bracket) left cylinder head)
• (eng harn, 12cm from breakout to right glow plugs) s117
• (eng harn, near breakout to glow plug control sw) s122
• (rear of
• 10a
• A/t
• Acc
• Battery junction block (on top left rear of intake manifold)
• Clutch pedal position (cpp) switch (closed with clutch pedal depressed) (on top of clutch pedal support)
• Crank fuse (engine harness, right of steering column)
• Crk (start)
• D100 (engine harn, approx 13cm from breakout to a/c compressor high press cutoff sw)
• Eng-1 fuse 15 20a
• Fuel heater (at fuel filter assembly)
• Fuel injection pump cold advance solenoid (in fuel injection pump)
• Fuel injection pump cold advance solenoid/ engine coolant temperature switch (on rear of right cylinder head)
• G114
• G200 (left interior bulkhead, near relay bracket)
• Glow plug control switch (rear of left cylinder head)
• Glow plug ctrl
• Glow plug stud
• Glow plug tell tale relay (on relay bracket. left sdie of interior bulkhead)
• Ground
• Hot at all times
• Hot in run or start
• I/p fuse block (behind dash panel) (body builder installed)
• Idle speed control solenoid actuator (on front of fuel injection pump)
• Ign feed
• Ignition switch
• Ind lamp out
• Left bank glowplugs (on cylinder heads, below valve covers)
• Lock
• M/t
• Off
• On (run)
• Park/neutral position (pnp) & backup lamps switch (closed in park or neutral) (left side near middle of transmission)
• Pnk
• Red
• Right bank glowplugs (on cylinder heads, below valve covers)
• S stud
• S109 (eng harn, approx 33cm from left bulkhead grommet)
• S110
• S115
• S116
• S135
• S172 (eng harn)
• Starter feed
• Starter relay (on eng firewall relay bracket, under battery junction block)
• Starter solenoid (on starter, at lower right side of engine)
• Stud
• 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 P12 1998

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (1 of 4) for Chevrolet Forward Control P12 1998:

• (left rear side of transmission) a/t output speed sensor
• (on lower right front of engine, behind torsional damper) crankshaft position sensor
• (on throttle valve assembly) idle air control valve
• 1-2 shift sol ctrl
• 1x cmp sig
• 2-3 shift sol ctrl
• 4x ckp sig
• A pnk
• Anti- lock brakes system
• Camshaft position sensor (internal to distributor)
• Ckp low
• Cmp low
• Ect signal
• Egr posit input
• Fuel gauge
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (on right exhaust pipe before catalytic converter)
• Ho2s high
• Ho2s low
• Iac a high
• Iac b high
• Iac high
• Iac low
• Iat signal
• Ign feed
• Injector 1 ctrl
• Injector 2 ctrl
• Injector 3 ctrl
• Injector 4 ctrl
• Injector 5 ctrl
• Injector 6 ctrl
• Injector 7 ctrl
• Injector 8 ctrl
• Ks signal
• Left knock sensor (on lower left side of engine)
• Maf signal
• Map signal
• Nca
• Pnk
• Pnk d
• Pwm tcc sol ctrl
• Right knock sensor (on lower right side of engine)
• S131 (eng harn, 13 cm from breakout for egr, toward map sensor)
• Sens rtn
• Sens sig
• Sensor rtn
• Sensor signal
• Tan
• Tan a
• Tft signal
• Tp signal
• Vehicle control module (vcm) (center front of engine compartment)
• Vss
• Vss low
• Vss signal

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P12 1998

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (2 of 4) for Chevrolet Forward Control P12 1998:

• Automatic transmission
• Ecm-1 fuse 12 20a
• Eng-1 fuse 15 20a
• Exhaust gas recirculation valve solenoid (left side of intake plenum)
• Fluid temperature sensor (internal)
• Force motor
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel inj 7
• Fuel inj 8
• G117 (13 cm from breakout for ignition coil)
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (on left exhaust pipe before catalytic converter)
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (on left exhaust pipe after catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (on right exhaust pipe after catalytic converter)
• Hot in run and start
• I/p fuse block
• Ignition
• Intake air temp sensor (mounted in fresh air intake behind air filter box)
• Nca
• Pnk
• Pnk d
• Pnk e
• Pnk n pressure
• Pnk pnk
• Red
• 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 P12 1998

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (3 of 4) for Chevrolet Forward Control P12 1998:

• (10 cm from breakout for generator) g120
• (17 cm from rear lamp harness) g415
• (eng harn, 20 cm from breakout for cruise control module, toward vcm)
• (eng harn, 4cm from breakout for cruise control module, toward relays)
• (eng harn, 7 cm from breakout for left front wheel speed sensor, toward eng) s127
• A/c compressor high pressure cut-off switch (on rear of a/c compressor)
• Eng-bat fuse 10 15a f1
• Engine coolant temperature sensor (on top front of engine)
• Fuel gauge
• Fuel pump and fuel tank sender (on top of fuel tank)
• Fuel pump/ oil pressure switch (on top left rear of engine)
• G120 (10 cm from breakout for generator)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run and start
• I/p fuse block
• Instrument cluster
• Malfunction indicator lamp (mil) (service engine soon)
• Manifold absolute pressure (map) sensor (top center front of engine)
• Mass air flow sensor (right front of engine comp, on air intake assembly)
• Nca
• Oil press gauge
• Pnk
• Red
• S119 (eng harn, 4 cm from breakout for generator, toward cruise control module)
• S120
• S126
• S132
• S140
• S141
• S154
• S165
• S400
• Speed meter
• Tach
• Tan
• Throttle position sensor (on throttle body, top of engine)
• Trans fuse 17 10a

7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P12 1998

List of elements for 7.4L (VIN J), Engine Performance Wiring Diagrams, Motor Home Chassis (4 of 4) for Chevrolet Forward Control P12 1998:

• (10 cm from breakout for generator) g120
• (i/p harn, 15 cm from breakout for abs harn) s202
• 87a
• A/c comp cyl sw
• A/c rec
• A/c relay
• A/c request signal
• Air conditioning system
• Anti-lock brakes system
• Automatic transmission input shaft speed sensor (left side of transmission)
• Aux elect cooling fan
• B +
• Battery feed
• Brake signal
• Brake/transmission shift interlock (btsi) relay (mounted on top of support bracket at driver's island)
• Check engine lp ctrl
• Cooling fans system
• Cruise control module (on radiator support bracket)
• Cruise ctrl engaged
• Cruise engaged sig
• Cylinder 1
• Cylinder 2
• Cylinder 3
• Cylinder 4
• Cylinder 5
• Cylinder 6
• Cylinder 7
• Cylinder 8
• Data link connector (dlc) (below dash, near steering column)
• Distributor
• Ecm-b fuse 6 20a
• Egr valve feed
• Egr vlv ctrl
• Egr/map 5v ref
• Elec spk timing ctrl signal
• Est ctrl
• Evaporative emission canister purge valve (top left center of engine, behind a/c compressor)
• Fuel level module
• Fuel pmp rly ctrl
• Fuel pump prime connector
• Fuel pump relay (left side of engine compt)
• G114 (left rear of engine block)
• G120 (engine) (10 cm from breakout for generator)
• G202 (below left side of dash)
• Ground
• High voltage coil wire
• Hot at all times
• Hot in run
• I-3 fuse 9 15a
• I/p fuse block
• Ic cntrl
• Ign feed
• Ignition coil (on bracket at rear of intake plenum)
• Ignition coil module (on bracket at rear of intake plenum)
• Input speed sens high
• Input speed sens low
• Pcs high
• Pcs low
• Pnk
• Pnk a
• Purge canister sol
• Range signal a
• Range signal b
• Range signal c
• Red
• S114
• S116
• S126
• S166
• S200 (eng harn, 45 cm from breakout for map sensor, toward firewall)
• S203
• Sens ground
• Sensor ground
• Serial data
• Spark plugs
• Speed sensor input
• Tcc stoplamp switch (opens w/brake depressed) (right side of steering column upper support)
• Tcc/stoplamp input
• Tp sig 5v ref
• Vehicle control module (vcm) (on center front of engine compartment)
• Vss output signal