ENGINE PERFORMANCE – Chevrolet Forward Control P30 1999 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

4.3L

4.3L VIN W, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999

List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999:

• (on throttle body assembly) idle air control (iac) valve
• (right front of engine at crankshaft pulley)
• (top right side of engine) evaporative emissions (evap) canister purge 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 (internal to distributor)
• Ckp sens rtn
• Crankshaft position (ckp) sensor
• Ect sensor input
• Egr posit input
• Evaporative emissions (evap) canister vent valve (right frame rail in front of fuel tank)
• Fuel inj 1 ctrl
• Fuel inj 2 ctrl
• Fuel inj 3 ctrl
• Fuel inj 4 ctrl
• Fuel inj 5 ctrl
• Fuel inj 6 ctrl
• Fuel lev
• G114 (rear of left cylinder head)
• Hall effect sensor
• Heated oxygen sensor bank 1, sensor 1 pre-converter (left exhaust down pipe, before 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
• Ign feed
• Knock sens sig
• Knock sensor (ks) (top center rear of engine)
• Map sensor input
• Mass air flow input
• Nca
• Pnk
• Pnk c
• Pnk d
• Pnk pnk pnk
• Purge vent ctrl
• Return
• S138
• S139
• S140
• Sensor signal
• Tan
• Tank press sens
• Tank pressure sensor (top of fuel tank)
• Tcc pwm sol ctrl
• Tft sig
• Throttle position sens
• Vehicle control module (vcm) (com. van: left side of radiator support motor home: top of radiator support)
• Vehicle speed out
• Vehicle speed sensor (vss) (left side of transmission)
• Vss rtn
• Vss sig
• Whl spd sig, left frt

4.3L VIN W, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999

List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999:

• (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 1 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 down pipe, before catalytic converter)
• Heated oxygen sensor, bank 1 sensor 2 (on exhaust system after catalytic converter)
• Hot in run & start
• I/p fuse block (behind dash panel) (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 (3 of 4) for Chevrolet Forward Control P30 1999

List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Forward Control P30 1999:

• (eng harn, approx 23 cm from ect sensor breakout)
• (eng harn, approx 8cm from tps breakout) s136
• (engine harn, 7 cm from ignition control module breakout)
• (left frame rail, in front of fuel tank) g416
• 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 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 (behind dash panel) (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 (near center of intake manifold, behind air intake)
• Map
• Mass air flow sensor (maf) (mounted in fresh air intake, behind air filter box)
• Nca
• Pnk
• Pnk pnk pnk
• R100 (1100 ohms .75 watts)
• Red
• Ref lo
• S119 (eng harn, approx 11cm from ect sensor breakout)
• S135
• S138
• S142 (eng harn, approx 23cm from maf sensor breakout)
• S144
• S145
• S207
• S218
• S406
• Speedo meter
• Tacho meter
• Tan a
• Temp
• Throttle position (tp) sensor (on throttle body, top of engine)

4.3L VIN W, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999

List of elements for 4.3L VIN W, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999:

• (engine harn, 18 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
• Brake sig
• Cylinder 1
• Cylinder 2
• Cylinder 3
• Cylinder 4
• Cylinder 5
• Cylinder 6
• Data link connector (dlc) (partial) (below dash, near steering column)
• Distributor (top rear of engine)
• Ecm bat fuse 6 20a
• Egr valve ctrl
• Electronic brake control module
• Evap can purge ctrl
• Fuel level
• Fuel pump prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (com. van: on engine firewall relay bracket, under battery junction block, motor home: on right side of driver's island)
• 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 (behind dash panel) (body builder installed)
• Ign feed
• Ignition coil (top right side of engine)
• Ignition control module (right top of engine, at ignition coil)
• Ignition feed
• 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
• S133
• S134
• S138
• S143
• S150
• S200
• Serial data
• Shift interlock system
• Spark plugs
• Timing control return
• Timing control signal
• Timing ctrl sig
• Torque converter clutch & stop lamp switch (at brake pedal suppport)
• Transmission input speed sensor (on left side of trnasmission, near the middle)
• Vcm ground
• Vehicle control module (vcm) (com van: left side of radiator support motor home: top of radiator support)
• Vss output

5.7L

5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999:

• (on throttle body assembly) idle air control (iac) valve
• (right front of engine at crankshaft pulley) crankshaft position sensor (ckp)
• (top right side of engine) evaporative emissions (evap) canister purge valve
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 4x ckp sens sig
• A pnk
• Anti-lock brake system
• Cam posit sens rtn
• Cam posit sens sig
• Camshaft position (cmp) sensor (internal to distributor)
• Ckp sens rtn
• Ect sensor in
• Egr posit in
• Evaporative emissions (evap) canister vent solenoid valve (on right frame rail in front of fuel tank)
• Fuel inj 1 ctrl
• Fuel inj 2 ctrl
• Fuel inj 3 ctrl
• Fuel inj 4 ctrl
• Fuel inj 5 ctrl
• Fuel inj 6 ctrl
• Fuel inj 7 ctrl
• Fuel inj 8 ctrl
• Fuel lev signal
• Fuel tank pressure sensor (at fuel tank)
• G114 (rear of left cylinder head)
• Hall effect sensor
• Heated oxygen sensor, bank 1 sensor 1 (left exhaust down pipe, after catalytic converter)
• Heated oxygen sensor, bank 2 sensor 1 (right exhaust down pipe. before 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 c
• Pnk d
• Pnk pnk
• Purge vent
• S138
• S139
• S140
• Tan
• Tan a
• Tank pressure
• Tcc pwm sol ctrl
• Tft sig
• Throttle posit sens
• Vehicle control module (vcm) (com. van: left side of radiator support, motor home: top of radiator support)
• Vehicle speed out
• Vehicle speed sensor (vss) (left side of transmission)
• Vss rtn
• Vss sig

5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999:

• (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) valve (top front of engine)
• Fuel injector
• Heated oxygen sensor, bank 1 sensor 2 (left exhaust system, after catalytic converter)
• Heated oxygen sensor, bank 2 sensor 2 (right exhaust system after catalytic converter)
• Hot in run & start
• I/p fuse block (behind dash panel) (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 (3 of 4) for Chevrolet Forward Control P30 1999

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Forward Control P30 1999:

• (eng harn, approx 23 cm from maf sensor breakout)
• (eng harn, approx 4 cm from breakout for in-line connector toward ignition control module)
• (eng harn, approx 8cm from ect sensor breakout)
• (eng harn, approx 8cm from tp sensor breakout)
• (left frame rail, in front of fuel tank) g416
• (rear of left cylinder head) g114
• 5v ref
• A/c compressor high pressure cut-off switch (rear of a/c compressor)
• Engine coolant temperature (ect) sensor (top front of engine)
• F2 eng-bat fuse 10 15a f1
• Fuel gauge
• Fuel sender & fuel pump (top of fuel tank)
• G114 (rear of left cylinder head)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run & start
• I/p fuse block (behind dash panel) (body builder installed)
• Instrument cluster
• Intake air temperature (iat) sensor (mounted in fresh air intake, behind air filter box)
• Manifold absolute pressure (map) sensor (near center of intake manifold, behind air intake)
• Map
• Mass air flow (maf) sensor (mounted in fresh air intake, behind air filter box)
• Nca
• Pnk
• R100 (1100 ohms .75 watts)
• Red
• Ref lo
• S119 (eng harn, approx 4cm from ect sensor breakout)
• S135
• S136
• S138
• S142
• S144
• S145
• S207
• S218
• S406
• Service engine soon indicator
• Speedo meter
• Tacho meter
• Tan
• Tan a
• Temp
• Throttle position (tp) sensor (on throttle body, top of engine)
• Trans fuse 17 10a

5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999

List of elements for 5.7L VIN R, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999:

• (below dash,
• (eng harn, approx 18 cm from breakout for in-line connector, toward left bulkhead grommet)
• (i/p harn, approx 19 cm from left bulkhead grommet)
• (left interior bulkhead near relay bracket) 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
• 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-bat fuse 6 20a
• Egr ctrl
• Electronic brake control module
• Evap canp valve driver
• Feed ignition
• Fuel lev
• Fuel pump a prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (com. van: on engine firewall relay bracket, under battery junction block, motor home: on right side of driver's island)
• 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 (behind dash panel) (body builder installed)
• Ign feed
• Ignition coil (top right side of engine)
• Ignition control module (right top of engine, at ignition coil)
• 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
• Return control
• S110
• S133
• S134
• S138
• S143
• S150
• S200
• Serial data
• Signal control timing
• Spark plugs
• Timing ctrl sig
• Torque converter clutch & stop lamp switch (at brake pedal support)
• Transmission input speed sensor (left side of transmission, near the middle)
• Vcm gnd
• Vehicle control module (vcm) (com. van: left side of radiator support, motor home: top of radiator support)
• Vss output

6.5L

6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (1 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (1 of 4) for Chevrolet Forward Control P30 1999:

• (eng harn, 14 cm from in-line connector toward fuel heater)
• (eng harn, 20 cm from oil pressure gauge sensor breakout)
• (lower left front of eng, behind torsional damper) crankshaft position sensor
• (on top right center of engine) boost sensor
• (or 506)
• (top of engine, in air intake) intake air temperature sensor
• (top of thermostat housing) g119
• (top right front of engine) engine coolant temperature sensor
• A/c request sig
• A/c system
• 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
• B10
• B11
• B12
• Battery
• Boost & ckp 5 volt ref
• Boost sensor sig
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Camshaft posit sens
• Ckp sen grd
• 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
• Pnk
• Powertrain control module (pcm) (left side of driver's island on relay bracket)
• 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
• S143
• S180
• S186
• Sensor gnd
• Set
• Solenoid valve 1-2 shift
• Solenoid valve 2-3 shift
• Solenoid valve tcc pwm
• Solid state
• Speed control switch
• Stoplamp switch
• Tan
• 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 input shaft speed sensor (left side of transmission, near the middle)
• Transmission output speed sensor (left side of trans- mission, near the middle)
• Transmission speed input
• Transmission temperature sensor
• Vehicle speed sensor calibrator (left side of driver's island under relay bracket)
• Vss out
• Vss signal

6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (2 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (2 of 4) for Chevrolet Forward Control P30 1999:

• (at brake pedal support)
• (i/p side of eng harn, 8 cm from breakout for turn signal switch connector) s200
• 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
• Electronic brake control module (below radiator, on lower crossmember)
• Eng-1 h6
• Engine shutoff solenoid (at fuel injection pump)
• F4 i-3 fuse 9 15a f3
• Fuel sol high
• Fuel sol low
• Fuel sole- noid
• Fuel solenoid driver (on side of fuel injection pump)
• Fuse 15 20a
• G6 ecm-1 fuse 12 20a g5
• Haz fuse 11 15a
• Hazard lamps flasher (inner left side steering column support bracket)
• High
• Hot at all times
• Hot in run
• Hot in run or 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 assembly)
• Pnk
• Red
• S185
• S224 (i/p side of eng harn, 16 cm from left bulkhead grommet toward pcm)
• S229
• S232
• Stop lamp switch
• Stop/ g7
• Tan d
• Torque converter clutch (tcc) & stoplamps switch

6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (3 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (3 of 4) for Chevrolet Forward Control P30 1999:

• (eng harn, approx 24 cm from in-line connector toward fuel heater) s182
• (left frame rail, infront of fuel tank) g416
• (right rear of eng) g117
• 87a
• California
• Ecm-bat fuse 6 20a
• Eng- bat fuse 10 15a
• Federal
• Fuel heater (part of fuel/water separator)
• Fuel lift pump (inside right frame rail)
• Fuel pump prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (on right side of driver's island)
• G119 (top of thermostat housing)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run and start
• I/p fuse block
• Instrument cluster
• Malfunction indicator lamp (mil)
• Pnk
• Red
• S114
• S168
• S181
• S206
• S211
• S235
• S400
• Service throttle soon indicator
• Speed meter
• Tan
• Wait to start indicator
• Wastegate solenoid (top left rear of eng)
• Water in fuel indicator
• Water in-fuel indicator sensor (part of fuel/water separator (filter), rear of intake manifold)

6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (4 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN F, Engine Performance Wiring Diagrams, Motorhome Chassis (4 of 4) for Chevrolet Forward Control P30 1999:

• "serv throttle soon" ind
• (dlc) (partial) (below dash, near steering column)
• (left rear of eng, near firewall) glow plug controller
• A/c enable
• A/c system
• Antilock brakes system
• App 2 5 volt ref
• Battery
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• C4 a
• California
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector
• Eso ctrl
• Federal
• Fuel inject ctrl
• Fusible link (22 ga rust)
• G117 (right rear of eng)
• G119 (top of thermostat housing)
• G207 (top front of steering column support plate)
• Glow plug controller (left rear of eng, near firewall)
• Glow plug out
• Glow plug sig
• Grd
• Ground
• Hot at all times
• Ignition
• Left bank glow plugs
• Mil ind ctrl
• Nca
• Pnk
• Powertrain control module (pcm) (left side of driver's island on relay bracket)
• Red
• Right bank glow plugs
• Rly ctrl
• S101
• S143
• S181
• Serial data sig
• Shift sol 1-2 input
• Shift sol 2-3 input
• Tan
• Tcc pwm sol vlv ctrl
• Wait to start ind ctrl
• Wastegate sol ctrl
• Wiper switch) s202

6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (1 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (1 of 4) for Chevrolet Forward Control P30 1999:

• (a/t)
• (center rear of intake manifold) manifold absolute pressure sensor
• (eng harn, 14 cm from in-line connector toward fuel heater)
• (eng harn, 20 cm from oil pressure gauge sensor breakout)
• (eng harn, approx 17 cm from breakout for in-line conn. toward left bulkhead grommet)
• (front of engine, in air intake) intake air temperature sensor
• (left rear of cylinder head) g114
• (lower left front of eng, behind torsional damper) crankshaft position sensor
• (m/t)
• (or 506)
• (right front of eng, near generator bracket) g119
• (top right front of engine) engine coolant temperature sensor
• 2-3 shift solenoid valve
• 379 (or 420)
• A/c request sig
• A/c system
• A/t
• 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
• B10
• B11
• B12
• Battery
• Boost & ckp 5 volt ref
• Boost sensor sig
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Camshaft posit sens
• Ckp sen grd
• Ckp sens input
• Closure gnd
• Closure signal
• Clutch pedal position switch (top of clutch pedal suport)
• 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
• M/t
• Oss high
• Oss low
• Oss sig
• Pnk
• Powertrain control module (pcm) (left side of driver's island on relay bracket)
• Press ctrl sol vlv hi
• Press ctrl sol vlv lo
• Pressure control solenoid valve
• Pump cam 5 volt ref
• Range mode selector
• Red
• S129 (a/t)
• S143
• S180
• S186
• Sensor gnd
• Solenoid valve 1-2 shift
• Solid state
• 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 input shaft speed sensor (left side of transmission, near the middle)
• Transmission output speed sensor (left side of trans- mission, near the middle)
• Transmission speed input
• Transmission temperature sensor
• Vehicle speed sensor calibrator (left side of driver's island under relay bracket)
• Vss out
• Vss signal

6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (2 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (2 of 4) for Chevrolet Forward Control P30 1999:

• (at brake pedal support)
• (eng harn, approx 14 cm from oil pressure gauge sensor breakout)
• (eng harn, approx 14 cm from oil pressure gauge sensor breakout) s184
• (eng harn, approx 32 cm from breakout for battery junction block) s102
• 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
• Electronic brake control module (below radiator, on lower crossmember)
• Eng-1 h6
• Engine shut-off solenoid (at fuel injection pump)
• F4 i-3 fuse 9 15a f3
• Fuel sol high
• Fuel sol low
• Fuel sole- noid
• Fuel solenoid driver (on side of fuel injection pump)
• Fuse 15 20a
• G6 ecm-1 fuse 12 20a g5
• G7 stop/haz fuse 11 15a g8
• High
• Hot at all times
• Hot in run
• Hot in run or 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 assembly)
• Pnk
• Red
• S108
• S185
• S222
• S233
• Tan d
• Torque converter clutch (tcc) & stoplamps switch

6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (3 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (3 of 4) for Chevrolet Forward Control P30 1999:

• (a/t)
• (eng harn, approx 24 cm from in-line connector toward fuel heater) s182
• (left rear of cylinder head) g114
• (m/t)
• (right front of eng, near generator bracket) g119
• 87a
• California
• Ecm-bat fuse 6 20a
• Eng- bat fuse 10 15a
• Federal
• Fuel heater (part of fuel/water separator)
• Fuel lift pump (inside right frame rail)
• Fuel pump prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (on engine firewall relay bracket, under battery junction block)
• Gauges fuse 8 20a
• Hot at all times
• Hot in run and start
• I/p fuse block
• Instrument cluster
• Malfunction indicator lamp (mil)
• Pnk
• Red
• S118
• S144
• S171 (eng harn, approx 7 cm from breakout to a/c compressure refrigerant pressure switch connector)
• S181
• S206
• S207
• S225
• Service throttle soon indicator
• Speed meter
• Tan
• Wait to start indicator
• Wastegate solenoid (top left rear of eng)
• Water in fuel indicator
• Water in-fuel indicator sensor (part of fuel/water separator (filter), rear of intake manifold)

6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (4 of 4) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Electronic (4 of 4) for Chevrolet Forward Control P30 1999:

• "serv throttle soon" ind
• (a/t)
• (a/t) (m/t)
• (dlc) (partial) (below dash, near steering column)
• (left rear of cylinder head) g114
• (left rear of eng, near firewall) glow plug controller
• (m/t)
• (right front of eng, near generator bracket) g119
• A/c enable
• A/c system
• Antilock brakes system
• App 2 5 volt ref
• Battery
• Battery junction block) s104
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• C4 a
• California
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector
• Eso ctrl
• Federal
• Fuel inject ctrl
• Fusible link (22 ga rust)
• G202 (left interior bulkhead, near relay bracket)
• Glow plug controller (left rear of eng, near firewall)
• Glow plug out
• Glow plug sig
• Grd
• Ground
• Hot at all times
• Ignition
• Left bank glow plugs
• Mil ind ctrl
• Nca
• Pnk
• Powertrain control module (pcm) (left side of driver's island on relay bracket)
• Red
• Right bank glow plugs
• Rly ctrl
• S143
• S168 s110
• S181
• Serial data sig
• Shift sol 1-2 input
• Shift sol 2-3 input
• Tan
• Tcc pwm sol vlv ctrl
• Wait to start ind ctrl
• Wastegate sol ctrl

6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (1 of 3) for Chevrolet Forward Control P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (1 of 3) for Chevrolet Forward Control P30 1999:

• (eng harn, approx 6cm from breakout to glowplug controller)
• (rear of left cylinder head) g114
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 5v ref
• A10
• A11
• A12
• A8 a6
• 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 (mounted on top of steering column support at driver's island)
• 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 lower crossmember)
• Eng speed sens in
• Engine speed sensor (rear of intake manifold, near fuel filter)
• 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
• S108
• S111 (eng harn, approx 10 cm from starter motor breakout)
• S119
• S133
• S143
• S170
• S200 (dash side of eng harn, approx 16 cm from left bulkhead grommet toward ignition switch)
• Sensor return
• Serial data
• Service trans out
• 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) (at brake pedal support)
• Tp sens sig
• Transmission input speeed sensor (on left side of transmission, near the middle)
• Transmission control module (tcm) (on left side of driver's island, on relay bracket)
• Vehicle speed sensor (vss) (left side of transmission)
• Vehicle speed sensor (vss) calibrator (left side of driver's island, under relay bracket)
• 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 P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (2 of 3) for Chevrolet Forward Control P30 1999:

• "wait to start" glow plugs
• (a/t)
• (m/t)
• (rear of left cylinder head)
• (rear of left cylinder head) g114
• (right front of eng, near generator bracket)
• (taped to fuel pump relay breakout) fuel pump prime connector
• 1-2 shift solenoid
• 2-3 shift solenoid
• Automatic transmission (rear of engine)
• Ecm-1 fuse 12 20a
• Ecm-bat fuse 6 20a
• Fuel injection pump shut-off solenoid (at fuel injection pump)
• Fuel lift pump (on inside right frame rail)
• Fuel pump relay (on engine firewall bracket, under battery junction block)
• G114
• G114 (rear of left cylinder head)
• G119
• Gauges fuse 8 20a
• Hot at all times
• Hot in run or start
• I/p fuse block (behind dash panel) (body builder installed)
• Instrument cluster
• Nca
• Orn
• Pnk
• Pressure control solenoid
• Red
• S108
• S118
• S143
• S170
• S207
• S218
• Service trans
• Speedo meter
• 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 P30 1999

List of elements for 6.5L VIN Y, Engine Performance Wiring Diagrams, Commercial Chassis - Mechanical (3 of 3) for Chevrolet Forward Control P30 1999:

• (a/t)
• (eng harn, approx 11 cm from breakout for gerator)
• (m/t)
• (part of fuel/water separator (filter), rear of intake manifold) water in-fuel indicator sensor
• (rear of left cylinder head)
• 10a
• A/t
• Acc
• Battery feed
• Battery junction block (on left rear of eng compt)
• Clutch pedal position (cpp) switch (closed with clutch pedal depressed) (on top of clutch pedal support)
• Cold advance solenoid engine coolant temperature switch (on rear lower portion of right cylinder head, near exhaust manifold)
• Crank fuse (upper right side of steering column support)
• D100 (engine harn, approx 25 cm from breakout for battery junction block)
• Eng-1 fuse 15 20a
• Fuel heater (rear of intake manifold, part of fuel/ water separator)
• Fuel injection pump cold advance solenoid (at fuel injection pump)
• Fusible link (22 ga rust)
• G114
• G119 (right front of eng, near generator bracket)
• Glow plug controller (left rear of eng, near firewall)
• Glow plug ctrl
• Glow plug out
• Glow plug relay 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 actuator solenoid (on bracket on front fuel injection pump)
• Ign feed
• Ignition switch
• Ind lamp out
• Left bank glow plugs
• Lock
• M/t
• Not used
• Off
• Park/neutral position (pnp) & back-up lamps switch (closed in park or neutral) (left side near middle of transmission)
• Pnk
• Red
• Right bank glow plugs
• Run
• S stud
• S109 (eng harn, approx 11 cm from breakout for fuel pump & starter relay
• S110
• S115
• S116
• S118
• S168
• S172 (eng harn, approx 13 cm from breakout for cold advance solenoid)
• Start
• Starter feed
• Starter relay (on eng firewall relay bracket, under battery junction block)
• Starter solenoid (on starter, at lower right side of engine)
• Stud

7.4L

7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (1 of 4) for Chevrolet Forward Control P30 1999:

• (left side of transmission near the middle) transmission 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
• Anti- lock brakes system
• Camshaft position sensor (internal to distributor)
• Ckp low
• Cmp low
• Ect signal
• Egr posit input
• Feed ign a pnk
• Fuel gauge
• G117 (right rear of eng)
• Heated oxygen sensor (ho2s) bank 2 sensor 1 (on right exhaust down 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
• Tan
• Tan a
• Tft signal
• Tp signal
• Vehicle control module (vcm) (comm: left side of radiator support, motor home: top of radiator support)
• Vss
• Vss low
• Vss signal

7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (2 of 4) for Chevrolet Forward Control P30 1999:

• Automatic transmission
• Ecm-1 fuse 12 20a
• Eng-1 fuse 15 20a
• Exhaust gas recirculation valve solenoid (top left side of eng)
• 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 (right rear of eng)
• Heated oxygen sensor (ho2s) bank 1 sensor 1 (on left exhaust system down pipe, before catalytic converter)
• Heated oxygen sensor (ho2s) bank 1 sensor 2 (on left exhaust system, after catalytic converter)
• Heated oxygen sensor (ho2s) bank 2 sensor 2 (on right exhaust system 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 switch
• Pnk pnk
• Red
• Red p pressure
• S104
• S121
• S133
• S135
• S158
• S159
• Solenoid
• Solenoid 1-2
• Solenoid 2-3
• Switch
• Tan
• Tan a

7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Forward Control P30 1999

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (3 of 4) for Chevrolet Forward Control P30 1999:

• (body builder)
• (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
• (left frame rail in front of fuel tank) g416
• 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 module (on top of fuel tank)
• G117 (right rear of eng)
• G119 (on top of thermostat housing)
• 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
• Pnk
• R102 (eng harn, approx 23 cm from breakout to maf & iat sensor)
• Red
• S119 (eng harn, 4 cm from ect & a/c compressor clutch breakout)
• S120
• S126
• S132 (eng harn, at resistor r102, in pcm breakout, 20 cm from main harness toward fuel pump relay)
• S140
• S206
• S211
• S235
• S400
• Speed meter
• Tach
• Throttle position sensor (on throttle body, top of engine)
• Trans fuse 17 10a

7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999

List of elements for 7.4L VIN J, Engine Performance Wiring Diagrams (4 of 4) for Chevrolet Forward Control P30 1999:

• (i/p harn, 15 cm from breakout for abs module) s170
• 87a
• A pnk
• A/c comp cyl sw
• A/c rec
• A/c relay
• A/c request signal
• Air conditioning system
• Anti-lock brakes system
• Aux elect cooling fan
• B +
• Battery feed
• Brake signal
• Brake/transmission shift interlock (btsi) relay (comm: behind left side of dash, on relay bracket, motor home: on top of steering support at driver's island)
• Check engine lp ctrl
• Cooling fans system
• Cruise control module (on radiator support bracket)
• Cruise ctrl engaged
• Cruise engaged sig
• Ctrl est
• 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
• Evaporative emission canister purge valve (top left center of engine)
• Fuel level module
• Fuel pmp rly ctrl
• Fuel pump prime connector (taped to fuel pump relay breakout)
• Fuel pump relay (comm: on eng firewall relay bracket, behind steering column, motor home: on right side of driver's island)
• G117 (right rear of eng)
• G119 (on top of thermostat housing)
• 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 control 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
• S101
• S102 (eng harn, 25 cm from breakout for windshield wiper motor)
• S114
• S116
• S126
• S143
• Sens ground
• Sensor ground
• Serial data
• Signal timing ctrl elec spk
• Spark plugs
• Speed sensor input
• Tcc stoplamp switch (opens w/brake depressed) (at brake pedal support)
• Tcc/stoplamp input
• Tp sig 5v ref
• Transmission input speed sensor (left side of transmission, near the middle)
• Vcm ground
• Vehicle control module (vcm) (comm: left side of radiator support, motor home: top of radiator support)
• Vss output signal