ENGINE PERFORMANCE – GMC Cab & Chassis Sierra 3500 2001 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

6.0L

6.0L VIN U, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (below steering column) data link connector
• (lower right rear of engine) crankshaft position sensor
• +5v
• 3-2 ss
• Anti-lock brake system
• Body control module (below steering column)
• Brk sw
• C10
• C11
• C12
• Ckp
• Cls 2 data
• Clutch sw
• Cmp
• Coolant lev
• D10
• E12
• Ecm1 fuse 10a
• Ecmb fuse 20a
• Ect sig
• Egr input
• Electronic suspension system
• Fuse block
• G117 (right rear of engine)
• Gnd
• Ho2s hi
• Ho2s lo
• Hot at all times
• Hot in run & start
• Ign
• Ign 0 fuse 10a
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Inja fuse 15a
• Injb fuse 15a
• Injectors
• Ks signal
• Lift/dive sig
• Low ref
• O2b fuse 15a
• Oil lev
• Pnk
• Pnk b
• Powertrain control module (left front of engine compt)
• Prnd a
• Prnd b
• Prnd p
• Range b
• Range c
• Red
• Ref low
• Req torque
• S103
• Sens gnd
• Sens rtn
• Serial data
• Sp205 (behind headlamp switch)
• Tan
• Under- hood junction block

6.0L VIN U, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harness)
• (left front of engine)
• (left rear of engine)
• (left rear of engine) g114
• (not used)
• Ecm b fuse 20a
• Engine coolant level switch (in coolant reservoir)
• Engine coolant temperature sensor (left front of cylinder head)
• Engine oil level switch (right side of oil pan)
• Fuel pump relay
• G104
• G110
• G117 (right rear of engine)
• G402 (left frame body mount bracket)
• Heated oxygen sensor (bank 1 sensor 1) (left exh pipe before converter)
• Heated oxygen sensor (bank 1 sensor 2) (left exh pipe after converter)
• Heated oxygen sensor (bank 2 sensor 1) (right exh pipe before converter)
• Heated oxygen sensor (bank 2 sensor 2) (right exh pipe after converter)
• Hot at all times
• Knock sensor 1 (under intake manifold)
• Knock sensor 2 (under intake manifold)
• Nca
• Park/neutral position switch (left side of transmission)
• Pnk
• Primary fuel pump/ level sensor (in fuel tank)
• Red
• S103
• S104
• S113
• S114a
• S115
• S116
• S312
• Secondary fuel pump relay
• Secondary fuel pump/ level sensor (in fuel tank)
• Tan
• Throttle position sensor (w/o electronic throttle control) (on throttle body assy)
• Under- hood junction block

6.0L VIN U, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• 1-2 sol
• 2-3 sol
• A/t fluid pressure manual valve position switch
• Automatic transaxle
• Body junction block
• Brake fuse 10a
• Camshaft position sensor (top center rear of engine)
• Clutch pedal position switch (top of pedal bracket)
• Evap canister purge valve (top right rear of engine)
• Evap canister vent valve (left front side of fuel tank)
• Exhaust gas recirculation valve (top right front of engine)
• F12
• Fuel tank pressure sensor (in fuel tank)
• Fuse block
• Hot in run
• Hot in run & start
• Manifold absolute pressure sensor (top rear of engine)
• N pnk
• P red
• Pc sol valve
• Pnk
• Pnk a
• Pnk b
• Red
• Red e
• Red/
• Rev
• Stop lps fuse 20a
• Stop- lamp switch (top of brake pedal bracket)
• Tan
• Tcc pwm sol
• Tft sensor
• Vehicle speed sensor (left rear of transmission)
• Vss adapter (4wd) (left side of trans)

6.0L VIN U, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (right rear of engine compt) secondary air injection reaction solenoid
• A10
• Accelerator pedal position sensor (w/ electronic throttle control)
• Act cntrl
• Air maxi fuse 30a c7
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• Cruise control system
• Cruise req
• D11
• Data
• Ect fuse 15a
• Fuse block
• G114 (left rear of engine)
• G117 (right rear of engine)
• Gnd
• Ground
• Hot at all times
• Hot in run & start
• Hot in run or start
• Iat sensor
• Ign
• Ign e fuse 10a c2
• Ign0 fuse 10a
• Mass airflow sensor (in air intake duct)
• Nca
• Pnk
• Pnk d
• R/a input
• Red
• S/c input
• S103
• S104 (in engine harness)
• S108
• Secondary air injection reaction pump (right rear of engine compt)
• Secondary air injection reaction relay (in engine wiring harness junction block)
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Sens grd
• Signal
• Stp lp in
• Tan
• Tan b
• Throttle actuator control (tac) module (w/ electronic throttle control) (in left rear of engine compt)
• Throttle actuator control motor (w/ electronic throttle control) (on throttle body)
• Throttle position sensor (dual track) (w/ electronic throttle control) (on throttle body)
• Tp sens 1
• Tp sens 2
• Under- hood junction block
• Veh stop fuse 10a

6.0L VIN U, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.0L VIN U, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harness)
• (left front of engine) g110
• (left rear of engine) g114
• (pins 70-72 not used)
• 1-2 ss
• 2-3 ss
• 4wd low
• A/c clu
• A/c req
• A/c system
• Air pump
• Anti-lock brake system
• Anti-lock brake system (speed signal)
• Automatic trans- mission input shaft speed sensor
• Automatic transfer case control module (above c3 headlight switch)
• Cruise control system
• Cruise eng
• Ctrl
• Cyc sw in
• Delivered torq
• Egr ctrl
• Egr gnd
• Eng1 fuse 10a
• Evap canp
• Evap vent
• Front axle switch (right side of center on axle housing)
• Frt axle sw
• Fuel lev
• Fuel pmp
• Fuel sig ctrl
• Fuse block
• G117 (right rear of engine)
• Gen f
• Gen l
• Gnd
• Ho2s htr high
• Ho2s htr low
• Hot in run & start
• Hot in run & start
• Iac coil hi
• Iac coil lo
• Iat sig
• Idle air control valve (top of throttle body)
• Ign
• Ign ctrl
• Ign feed
• Ign1 fuse 10a
• Ignition coils
• Instrument cluster systems (speed signal)
• Instrument panel cluster
• Maf sig
• Malfunction indicator lamp
• Map sig
• Mil ctrl
• Nca
• Nca nca
• Pc sol hi
• Pc sol lo
• Pnk
• Pnk d
• Powertrain control module (left front of engine compt)
• Prnd c
• Recirc door
• Recirc sw
• Red
• Red c
• Ref lo
• Ref low
• Rpm out
• S103
• S151
• S152
• S153
• S154
• S156
• S157
• Sec fuel lvl
• Sec fuel pmp
• Sens gnd
• Spark plug
• Starting/charging system
• Tan
• Tft sens sig
• Tp sig
• Trans rng a
• Transfer case switch (left front of transaxle case)
• Under- hood junction block
• Vss high
• Vss low
• Vss out
• W/ atc
• W/ manual 4wd

6.6L

6.6L VIN 1, Engine Performance Wiring Diagrams, California (1 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (1 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (left rear of engine)
• 12v ref
• 5v ref
• A/c system
• B/u lp supp
• Batt
• Battery
• Body control module (left side of dash)
• Can high
• Can low
• Ccp sw
• Ckp signal
• Class2 data
• Cmp sig
• Cool lev
• Coolant level switch (in coolant reservoir)
• Crankshaft position sensor (right side of harmonic balancer)
• Cruise control system
• Data link connector (under left side of dash)
• Ecm1 fuse 10a
• Ect sig
• Engine control module (left front of engine compt)
• Engine coolant temperature sensor (next to oil filler tube)
• Engine oil level switch (left rear of oil pan)
• Ficm relay
• Fuse block
• G114
• G114 (left rear of engine)
• Gen 2 to
• Ground
• Hot in run & start
• Hot w/ vehicle in reverse
• Ia htr
• Ign 0 fuse 10a
• Ign 1
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Low ref
• Nca
• Off/run/crk
• Oil lev sw
• P/n sig
• Plug sig
• Pnk
• Pto en
• Res/acc
• S102
• S103
• Set/coast
• Splice pack sp205 (behind headlamp switch)
• Starting/ charging system
• Tan
• Transmission system
• Under- hood junction block
• Veh b/u fuse 15a
• Water in fuel
• Water in fuel sensor (attached to fuel filter)

6.6L VIN 1, Engine Performance Wiring Diagrams, California (2 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (2 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harness)
• (left rear of engine)
• A11
• Accelerator pedal position sensor (behind accelerator pedal)
• Battery
• Battery fuse 175a
• C11
• Camshaft position sensor (front of engine)
• Ecmb fuse 20a
• Ecmprv fuse 15a
• F1 c2
• Fuel heater (top of fuel filter element)
• Fuel ht fuse 25a
• Fuel pump (auxiliary tank) (left side frame rail)
• Fuel pump relay
• Fuse holder
• G113 (left front body mount)
• G114
• G114 (left rear of engine)
• G414 (left frame body mount)
• Glow plug controller
• Glow plugs
• Ground
• Hot at all times
• Hot in run & start
• Ign 1
• Ign 1 relay
• Intake air heater (rear of engine)
• Intake air heater relay (rear of engine)
• Intake air temperature/ mass airflow sensor (in air induction tube)
• Nca
• Plug sig
• Pnk
• Red
• Relay ctrl
• S102
• S172
• S173
• S174
• S175
• Series
• Tan
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, California (3 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (3 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harn)
• (in injector harn)
• (in injector harn) s167
• (left rear of eng)
• (pins 49-58 not used)
• (pins 6-43 not used)
• (pins 68-81 not used)
• (pins 82-89 not used)
• (pins 95-113 not used)
• (right front of eng) g119
• Baro sensor (left side of engine)
• Boost sensor (on intake manifold)
• C12
• Can hi
• Can low
• Eng1 fuse 10a
• Engine spd
• Fuel injector control module (right front of engine, under air intake duct assembly)
• Fuel injectors
• Fuel pressure sensor
• G114
• Ground
• Hot in run & start
• Ign
• Ign 2,3,5,8
• Ign pos
• Inj 8
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Injb fuse 25a
• Nca
• Pnk
• Red
• S119
• S166
• S168
• S169
• S170
• S171
• Tan
• Transmission control system
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, California (4 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, California (4 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harn)
• (left rear of eng)
• 12 v redf
• 4wd low
• 5 volt ref
• A/c clu rly
• A/c hi pres
• A/c low
• A/c req
• A/c system
• Anti-lock brake system
• App sens 1
• App sens 3
• Axle sig
• Baro sens
• Body junction block
• Boost sens
• Brake fuse 10a
• C1 c1
• Charge ind
• Chmsl supp
• Cruise control system
• Cruise fuse 10a
• Cruise on sig
• Electronic suspension system
• Engine control module (left front of engine compt)
• Engine spd
• Engine speed
• Exterior lights system
• F pmp rly ctrl
• Fog lamps fuse 15a
• Front sig hi
• Frp sens
• Fuel lev sens
• Fuel pres reg
• Fuel rail pressure regulator
• Fuel temp sig
• Fuel temperature sensor (under upper intake shield)
• Fuse block
• G114
• Gen f
• Glow plug rly
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ia htr
• Iat sens
• Ign 1 volt
• Ign1 fuse 10a
• Ind logic
• Instrument cluster
• Instrument cluster system
• Instrument panel cluster
• Interior lights system
• Lift/dive
• Low ref
• Maf sens
• Malfunction indicator lamp
• Mil ctrl
• Nca
• Off
• Pnk
• Power take off relay (attached to underhood fuse block bracket)
• Power take off switch
• Pto disable
• Pto engage
• Pto fdbk
• Recirc door
• Red
• Rpm out
• S103
• S163
• S164
• Set
• Sound system
• Sp203 (on top left of dash)
• Starting/charging system
• Stoplight switch (top of brake pedal bracket)
• Tan
• Tcc brake
• Tcm mil
• Transmission control module (left front of eng compt)
• Transmission control system
• Transmission system
• Under- hood junction block
• Vss
• Vss high
• Wait to start

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (1 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (1 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (left rear of engine)
• 12v ref
• 5v ref
• A/c system
• B/u lp supp
• Batt
• Battery
• Body control module (left side of dash)
• Can high
• Can low
• Ccp sw
• Ckp signal
• Class2 data
• Cmp sig
• Cool lev
• Coolant level switch (in coolant reservoir)
• Crankshaft position sensor (right side of harmonic balancer)
• Cruise control system
• Data link connector (under left side of dash)
• Ecm1 fuse 10a
• Ect sig
• Engine control module (left front of engine compt)
• Engine coolant temperature sensor (next to oil filler tube)
• Engine oil level switch (left rear of oil pan)
• Ficm relay
• Fuse block
• G114
• G114 (left rear of engine)
• Gen 2 to
• Ground
• Hot in run & start
• Hot w/ vehicle in reverse
• Ia htr
• Ign 0 fuse 10a
• Ign 1
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Low ref
• Nca
• Off/run/crk
• Oil lev sw
• P/n sig
• Plug sig
• Pnk
• Pto en
• Res/acc
• S102
• S103
• Set/coast
• Splice pack sp205 (behind headlamp switch)
• Starting/ charging system
• Tan
• Transmission system
• Under- hood junction block
• Veh b/u fuse 15a
• Water in fuel
• Water in fuel sensor (attached to fuel filter)

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (2 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (2 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (left rear of engine)
• A11
• Accelerator pedal position sensor (behind accelerator pedal)
• Battery fuse 175a
• C11
• Camshaft position sensor (front of engine)
• Ecmb fuse 20a
• Ecmprv fuse 15a
• F1 c2
• Fuel heater (top of fuel filter element)
• Fuel ht fuse 25a
• Fuel pump (auxiliary tank) (left side frame rail)
• Fuel pump relay
• Fuse holder
• G113 (left front body mount)
• G114
• G114 (left rear of engine)
• G414 (left frame body mount)
• Glow plug relay
• Glow plug/ intake heater relay assembly
• Glow plugs
• Hot at all times
• Hot in run & start
• Ign 1 relay
• Intake air heater (rear of engine)
• Intake air heater relay
• Intake air temperature/ mass airflow sensor (in air induction tube)
• Nca
• Pnk
• Red
• S102
• Series
• Tan
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (3 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (3 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harn)
• (in injector harn)
• (in injector harn) s167
• (left rear of eng)
• (pins 49-58 not used)
• (pins 6-43 not used)
• (pins 68-81 not used)
• (pins 82-89 not used)
• (pins 95-113 not used)
• (right front of eng) g119
• Baro sensor (left side of engine)
• Boost sensor (on intake manifold)
• C12
• Can hi
• Can low
• Eng1 fuse 10a
• Engine spd
• Fuel injector control module (right front of engine, under air intake duct assembly)
• Fuel injectors
• Fuel pressure sensor
• G114
• Ground
• Hot in run & start
• Ign
• Ign 2,3,5,8
• Ign pos
• Inj 8
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Injb fuse 25a
• Nca
• Pnk
• Red
• S119
• S166
• S168
• S169
• S170
• S171
• Tan
• Transmission control system
• Under- hood junction block

6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (4 of 4) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 6.6L VIN 1, Engine Performance Wiring Diagrams, Except California (4 of 4) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harn)
• (left rear of eng)
• 12 v redf
• 4wd low
• 5 volt ref
• A/c clu rly
• A/c hi pres
• A/c low
• A/c req
• A/c system
• Anti-lock brake system
• App sens 1
• App sens 3
• Axle sig
• Baro sens
• Body junction block
• Boost sens
• Brake fuse 10a
• C1 c1
• Charge ind
• Chmsl supp
• Cruise control system
• Cruise fuse 10a
• Cruise on sig
• Electronic suspension system
• Engine control module (left front of engine compt)
• Engine spd
• Engine speed
• Exterior lights system
• F pmp rly ctrl
• Fog lamps fuse 15a
• Front sig hi
• Frp sens
• Fuel lev sens
• Fuel pres reg
• Fuel rail pressure regulator
• Fuel temp sig
• Fuel temperature sensor (under upper intake shield)
• Fuse block
• G114
• Gen f
• Glow plug rly
• Ground
• Hot at all times
• Hot in run
• Hot in run & start
• Ia htr
• Iat sens
• Ign 1 volt
• Ign1 fuse 10a
• Ind logic
• Instrument cluster
• Instrument cluster system
• Instrument panel cluster
• Interior lights system
• Lift/dive
• Low ref
• Maf sens
• Malfunction indicator lamp
• Mil ctrl
• Nca
• Off
• Pnk
• Power take off relay (attached to underhood fuse block bracket)
• Power take off switch
• Pto disable
• Pto engage
• Pto fdbk
• Recirc door
• Red
• Rpm out
• S103
• S163
• S164
• Set
• Sound system
• Sp203 (on top left of dash)
• Starting/charging system
• Stoplight switch (top of brake pedal bracket)
• Tan
• Tcc brake
• Tcm mil
• Transmission control module (left front of eng compt)
• Transmission control system
• Transmission system
• Under- hood junction block
• Vss
• Vss high
• Wait to start

8.1L

8.1L VIN G, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (1 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (below steering column) data link connector
• (lower right rear of engine) crankshaft position sensor
• +5v
• Body control module (below steering column)
• Brk sw
• C10
• C11
• C12
• Ckp
• Cls 2 data
• Clutch sw
• Cmp
• Coolant lev
• E12
• Ecm1 fuse 10a
• Ecmb fuse 20a
• Ect sig
• Egr input
• Electronic suspension system
• Fuse block
• G117 (right rear of engine)
• Gnd
• Ho2s hi
• Ho2s lo
• Hot at all times
• Hot in run & start
• Ign
• Ign 0 fuse 10a
• Inj1
• Inj2
• Inj3
• Inj4
• Inj5
• Inj6
• Inj7
• Inj8
• Inja fuse 15a
• Injb fuse 15a
• Injectors
• Ks signal
• Lift/dive sig
• Low ref
• Nca
• O2b fuse 15a
• Oil lev
• Pnk
• Powertrain control module (left front of engine compt)
• Prnd p
• Pto enable
• Pto eng kill
• Pto engage
• Pto status
• Ref low
• Req torque
• S103
• S152
• S154
• Sens gnd
• Sens rtn
• Serial data
• Sp205 (behind headlamp switch)
• Tan
• Transmission control system
• Under- hood junction block

8.1L VIN G, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (2 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harness)
• (left front of engine)
• (left rear of engine)
• (left rear of engine) g114
• Ecm b fuse 20a
• Engine coolant level switch (in coolant reservoir)
• Engine coolant temperature sensor (left front of cylinder head)
• Engine oil level switch (right side of oil pan)
• Fuel pump relay
• G104
• G110
• G117 (right rear of engine)
• G402 (left frame body mount bracket)
• Heated oxygen sensor (bank 1 sensor 1) (left exh pipe before converter)
• Heated oxygen sensor (bank 1 sensor 2) (left exh pipe after converter)
• Heated oxygen sensor (bank 2 sensor 1) (right exh pipe before converter)
• Heated oxygen sensor (bank 2 sensor 2) (right exh pipe after converter)
• Hot at all times
• Knock sensor 1 (under intake manifold)
• Knock sensor 2 (under intake manifold)
• Nca
• Park/neutral position switch (left side of transmission)
• Pnk
• Primary fuel pump/ level sensor (in fuel tank)
• S103
• S104
• S114a
• S115
• S116
• S312
• Secondary fuel pump relay
• Secondary fuel pump/ level sensor (in fuel tank)
• Tan
• Under- hood junction block

8.1L VIN G, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (3 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• Body junction block
• Brake fuse 10a
• Camshaft position sensor (on left side of timing cover)
• Clutch pedal position switch (top of pedal bracket)
• Cruise control system
• Cruise fuse 10a
• Del torque
• Evap canister purge valve (top right rear of engine)
• Evap canister vent valve (left front side of fuel tank)
• Exhaust gas recirculation valve (top right front of engine)
• F12
• Fog lamps fuse 15a
• Fuel tank pressure sensor (in fuel tank)
• Fuse block
• G202 (upper left side of dash)
• Harn)
• Hot in run
• Hot in run & start
• Ind logic
• Interior lights system
• Manifold absolute pressure sensor (top rear of engine)
• Mil req
• Off
• Pnk
• Pnk a
• Pnk b
• Power take off relay (on underhood junction block)
• Power take off switch
• Red
• Red e
• Req torque
• S161
• S162
• S163
• S164 (engine harn)
• Set
• Stop lps fuse 20a
• Stop- lamp switch (top of brake pedal bracket)
• Tan
• Transmission control module (left front of engine compt)
• Under- hood junction block
• Unm tor
• Vehicle speed sensor (left rear of transmission)
• Vss
• Vss adapter (4wd) (left side of trans)

8.1L VIN G, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (4 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (right rear of engine compt) secondary air injection reaction solenoid
• A10
• Accelerator pedal position sensor
• Act cntrl
• Air maxi fuse 30a c7
• App sens
• App sens 1
• App sens 2
• App sens 3
• App sense
• Cruise control system
• Cruise req
• D11
• Data
• Ect fuse 15a
• G114 (left rear of engine)
• G117 (right rear of engine)
• Gnd
• Ground
• Hot at all times
• Hot in run & start
• Hot in run or start
• Iat sensor
• Ign
• Ign e fuse 10a c2
• Mass airflow sensor (in air intake duct)
• Nca
• Pnk
• Pnk d
• R/a input
• Red
• S/c input
• S103
• S104 (in engine harness)
• S108
• Secondary air injection reaction pump (right rear of engine compt)
• Secondary air injection reaction relay (in engine wiring harness junction block)
• Sens 1 grd
• Sens 1 rt
• Sens 2 grd
• Sens 2 rt
• Sens 3 grd
• Sens 3 rt
• Sens grd
• Signal
• Stp lp in
• Tan
• Tan b
• Throttle actuator control (tac) module (in left rear of engine compt)
• Throttle actuator control motor (near front of engine compt)
• Throttle position sensor (dual track) (near front of eng compt)
• Tp sens 1
• Tp sens 2
• Under- hood junction block
• Veh stop fuse 10a

8.1L VIN G, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 3500 2001

List of elements for 8.1L VIN G, Engine Performance Wiring Diagrams (5 of 5) for GMC Cab & Chassis Sierra 3500 2001:

• (in engine harness)
• (left front of engine) g110
• (left rear of engine) g114
• (pins 70-71 not used)
• (pins 76-79 not used)
• 4wd low
• A/c clu
• A/c req
• A/c system
• Air pump
• Anti-lock brake system (speed signal)
• Automatic trans- mission input shaft speed sensor
• Automatic transfer case control module (above c3 headlight switch)
• Cruise control system
• Cruise eng
• Ctrl
• Cyc sw in
• Delivered torq
• Egr ctrl
• Egr gnd
• Eng1 fuse 10a
• Evap canp
• Evap vent
• Front axle switch (right side of center on axle housing)
• Frt axle sw
• Fuel lev
• Fuel pmp
• Fuel sig ctrl
• Fuse block
• G117 (right rear of engine)
• Gen f
• Gen l
• Gnd
• Ho2s htr hi
• Ho2s htr high
• Ho2s htr low
• Ho2s low ctrl
• Hot in run & start
• Hot in run & start
• Iat sig
• Ign
• Ign ctrl
• Ign feed
• Ign1 fuse 10a
• Ignition coils
• Instrument cluster systems (speed signal)
• Instrument panel cluster
• Maf sig
• Malfunction indicator lamp
• Map sig
• Mil ctrl
• Nca
• Nca nca
• Pnk
• Pnk d
• Powertrain control module (left front of engine compt)
• Recirc door
• Recirc sw
• Red
• Red c
• Ref lo
• Ref low
• Rpm out
• S103
• S148
• S149
• S151
• S153
• S159
• S160
• Sec fuel lvl
• Sec fuel pmp
• Sens gnd
• Spark plug
• Starting/charging system
• Tan
• Tcc ctrl
• Trans mil
• Transfer case switch (left front of transaxle case)
• Under- hood junction block
• Vss high
• Vss low
• Vss out
• W/ atc
• W/ manual 4wd