ENGINE PERFORMANCE – Isuzu Ascender 2003 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

4.2L

4.2L, Engine Performance Wiring Diagram (1 of 5) for Isuzu Ascender 2003

List of elements for 4.2L, Engine Performance Wiring Diagram (1 of 5) for Isuzu Ascender 2003:

• 4wd low sig
• 5 volt ref
• A/c compr rel
• A/c press sens
• Accelerator pedal position sensor (above accelerator pedal)
• Air conditioning system
• Anti lock brakes system
• App sens 1 sig
• App sens 2 sig
• B10
• Battery
• Body control module (bcm) (beneath left rear seat)
• Cc on sw input
• Cls 2 data
• Cool fan clutch
• Cooling fan sp
• Cooling fans system
• Crank voltage
• Cruise control system
• Data link connector (on bottom left side of dash)
• Eng spd sig out
• F14
• Fuel tank press
• Fuel tank pressure sensor (top left rear of fuel tank)
• Hot at all times
• Hot in acacia, run or start
• Hot in run & start
• Iat sens sig
• Ign 0 fuse 47 10a
• Ign 0 input
• Ign 1 volt
• Ign e fuse 22 10a
• Instrument cluster system
• Instrument panel cluster
• Intake air temperature sensor (in air intake duct, top right of engine)
• Lo ref
• Low ref
• Malfunction indicator lamp
• Mil ctrl
• Pcb b fuse 10 20a
• Pnk
• Pnp sw input
• Powertrain control module (upper left side of engine)
• Prim fuel lvl
• Rear fuse block
• Res/acc sw
• Set/cruise sw
• Sp205
• Starting/ charging system
• Stop lamp volt
• Strt enable rel
• Tan
• Tcc rel sw sig
• Tcc/brake switch (above brake pedal, on bracket)
• Transmission controls (transfer case circuit)
• Underhood fuse block
• Vss
• Vss signal out

4.2L, Engine Performance Wiring Diagram (2 of 5) for Isuzu Ascender 2003

List of elements for 4.2L, Engine Performance Wiring Diagram (2 of 5) for Isuzu Ascender 2003:

• A11
• Ecm b fuse 10 20a
• Eng 1 fuse 26 10a
• Engine oil pressure switch (right side of eng block)
• Evaporative emission canister purge solenoid (left side of engine block)
• Evaporative emission canister vent solenoid (at rear of fuel tank)
• F/pmp relay
• Fuel pump/ & sender assembly (in fuel tank)
• G107 (lower left side of engine)
• G108 (lower left side of engine)
• G305 (on outside of left frame rail, near fuel tank)
• Hot at all times
• Hot in run & start
• Park/neutral position switch (lower left side of transmission)
• Pnk
• Pnk a
• Under- hood fuse block
• Under- hood junction block
• Vehicle speed sensor (left rear of transfer case)

4.2L, Engine Performance Wiring Diagram (3 of 5) for Isuzu Ascender 2003

List of elements for 4.2L, Engine Performance Wiring Diagram (3 of 5) for Isuzu Ascender 2003:

• (left rear of engine block) crankshaft position sensor
• 1-2 shift sol ctrl
• 2-3 shift sol ctrl
• 3-2 shift sol
• 5v ref
• Anti lock brakes system
• Cam pos sol hi
• Camshaft actuator solenoid assembly (right front of cylinder head)
• Ckp sens sig
• Deliv torque sig
• Ect sens sig
• Engine coolant temperature sensor (left front of engine block)
• Evap can prg ctl
• Evap can vent
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• G108 (lower left side of engine)
• Gfd cyc sig
• Ground powertrain control module (upper left side of engine)
• H02 hi sig b1 s2
• H02s hi sig b1 s1
• H02s lo sig b1 s2
• Heated oxygen sensor 1 (on exhaust manifold, right side of engine)
• Heated oxygen sensor 2 (downstream of catalytic converter)
• Ho2s htr lo b1 s1
• Ho2s htr lo b1 s2
• Ho2s lo sig b1 s1
• Hot at all times
• Hot in run & start
• Ic 1 ctrl
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 ctrl
• Ic 5 ctrl
• Ic 6 ctrl
• Injectors
• Low ref
• Manifold absolute pressure sensor (upper left side of engine)
• Map sens sig
• Nca
• O2 fuse 29
• Oil pres sw sig
• Pc sol high ctrl
• Pc sol low ctrl
• Pcm 1 fuse 28 15a
• Pnk
• Powertrain control module (upper left side of engine)
• Prim fuel pmp rel
• Req torque sig
• Starting/ charging system
• Tan
• Tcc pwm sol
• Tcc sol vlv ctrl
• Trns rg sw sig a
• Under- hood fuse block
• Vss high sig
• Vss low signal

4.2L, Engine Performance Wiring Diagram (4 of 5) for Isuzu Ascender 2003

List of elements for 4.2L, Engine Performance Wiring Diagram (4 of 5) for Isuzu Ascender 2003:

• Automatic
• Automatic transmission
• C10
• Ctrl
• D10
• D2 sw
• D3 sw
• D4 sw
• E10
• F10
• G109 (on lower side of engine)
• Gnd
• Ign
• Ignition coils
• Lo sw
• Nca
• Pnk
• Pnk a
• Pressure control
• Red
• Rev sw
• Solenoid 1-2 shift red
• Solenoid 2-3 shift red
• Solenoid 3-2 shift red
• Solenoid tcc pmw red
• Solenoid tcc red
• Solenoid valve
• Spark plug
• Tan
• Temperature sensor
• Transmission fluid
• Under- hood fuse block

4.2L, Engine Performance Wiring Diagram (5 of 5) for Isuzu Ascender 2003

List of elements for 4.2L, Engine Performance Wiring Diagram (5 of 5) for Isuzu Ascender 2003:

• (not used)
• 12v ref
• 5v ref
• Camshaft position sensor (right front of cylinder head)
• Cooling fans system
• Cpm sens sig
• Damping l/d sig
• Etc fuse 23 10a
• Gen turn on sig
• Hot in run & start
• Ign 1 voltage
• Knock sensor 1 (front) (lower left front of engine block)
• Knock sensor 2 (rear) (lower left rear of engine block)
• Ks 1 sig
• Ks 2 sig
• Low oil press sw
• Low ref
• Pnk
• Powertrain control module (upper left side of engine)
• Red
• Starting/ charging system
• Tac motor
• Tac mtr ctrl 1
• Tac mtr ctrl 2
• Tfp sw sig a
• Tfp sw sig b
• Tfp sw sig c
• Tft sens sig
• Throttle body (throttle position sensor) (on throttle body)
• Tp sens 1 sig
• Tp sens 2 sig
• Trs sig b
• Trs sig c
• Trs sig p
• Under- hood fuse block

5.3L

5.3L, Engine Performance Wiring Diagram (1 of 5) for Isuzu Ascender 2003

List of elements for 5.3L, Engine Performance Wiring Diagram (1 of 5) for Isuzu Ascender 2003:

• (at right rear of engine) crankshaft position (ckp) sensor
• +5v
• 12 volt ref
• 3-2 ss ctrl
• A/c system
• Anti-lock brakes system
• Batt volt
• C12
• Ckp sig
• Cls 2 data
• Cmp sig
• Computer data lines system
• Cool fan ctch
• Cooling fans
• Cooling fans system
• D12
• Ect sig
• G108 (lower left side of engine)
• Gnd
• Ho2s hi sig
• Ho2s lo
• Hot at all times
• Hot in accy, run & start
• Hot in run & start
• Ign 0 fuse 47 10a
• Ign 0 volt
• Ign 1 volt
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Inj 7 ctrl
• Inj 8 ctrl
• Inj a fuse 55 15a
• Inj b fuse 56 15a
• Injectors
• Ks 1 signal
• Ks 2 signal
• Low ref
• Low ref (a/t)
• O2a fuse 53 15a
• O2b fuse 54 15a
• Pcm b fuse 20a
• Pnk
• Pnk a
• Powertrain control module (near lower left front of engine)
• Prnd a sig
• Prnd b sig
• Prnd p sig
• Range b
• Range c
• Rear fuse block
• Red
• Req torq sig
• Rly ctrl
• Serial data
• Starting/ charging system
• Tan
• Tcc/brk sig
• Under- hood fuse block

5.3L, Engine Performance Wiring Diagram (2 of 5) for Isuzu Ascender 2003

List of elements for 5.3L, Engine Performance Wiring Diagram (2 of 5) for Isuzu Ascender 2003:

• A11
• Engine coolant temperature sensor (left front of engine block, near generator)
• F/pmp relay
• Fuel pump & sender assembly (inside fuel tank)
• G107 (on lower left side of engine)
• G108 (on lower left side of engine)
• G305 (on outside of left frame rail, near fuel tank)
• Heated oxygen sensor (bank 1 sensor 1) (left exh pipe, ahead of converter)
• Heated oxygen sensor (bank 1 sensor 2) (left exh pipe, behind converter)
• Heated oxygen sensor (bank 2 sensor 1) (right exh pipe, ahead of converter)
• Heated oxygen sensor (bank 2 sensor 2) (right exh pipe, behind converter)
• Hot at all times
• Knock sensor 1 (left) (below intake manifold on top of engine)
• Knock sensor 2 (right) (below intake manifold on top of engine)
• Nca
• Park/neutral position switch (on lower left side of transmission)
• Pcm b fuse 10 20a
• Pnk
• Pnk d
• Red
• Tan
• Tan a
• Under- hood fuse block

5.3L, Engine Performance Wiring Diagram (3 of 5) for Isuzu Ascender 2003

List of elements for 5.3L, Engine Performance Wiring Diagram (3 of 5) for Isuzu Ascender 2003:

• 1-2 sol
• 2-3 sol
• 3-2 sol
• A red
• A/t fluid pressure manual valve position switch
• Automatic transaxle
• Camshaft position sensor (top rear of engine block, near transmission)
• Engine oil pressure (eop) sensor
• Evaporative emission (evap) canister purge solenoid (left side of engine block)
• Evaporative emission canister vent solenoid (at rear or fuel tank)
• Fuel tank pressure sensor (top left rear of fuel tank)
• Manifold absolute pressure sensor (top of engine)
• N pnk
• P red
• Pc sol valve
• Pnk
• Pnk a
• Red
• Red/
• Rev
• Tan
• Tcc pwm sol
• Tcc sol
• Tft sensor
• Vehicle speed sensor (left rear of transfer case)

5.3L, Engine Performance Wiring Diagram (4 of 5) for Isuzu Ascender 2003

List of elements for 5.3L, Engine Performance Wiring Diagram (4 of 5) for Isuzu Ascender 2003:

• (above accelerator pedal) accelerator pedal position sensor
• App sens 1
• App sens 2
• B10
• B4 c1
• Canister fuse 10a
• Cruise control
• Cruise control system
• Cruise on
• Data
• E12
• Etc fuse 23 15a
• Exterior lights system
• G108 (on lower left side of engine)
• Ground
• Hot at all times
• Hot in run or start
• Iat
• Ign 1 volt
• Intake air temperature (iat) (in air intake duct)
• Low ref
• Maf
• Mass airflow (maf) sensor/
• Pnk
• R/a input
• Rear fuse block
• Red
• Ref low
• S/c input
• St/lp fuse 12 15a
• Stop- lamp switch (top of brake pedal bracket)
• Stp lp in
• Tac cntrl
• Tac ctrl
• Tan
• Throttle actuator control module (attached to throttle body)
• Throttle body
• Tp sens 1
• Tp sens 2
• Under- hood fuse block
• Underhood fuse block
• Veh stop fuse 34 15a

5.3L, Engine Performance Wiring Diagram (5 of 5) for Isuzu Ascender 2003

List of elements for 5.3L, Engine Performance Wiring Diagram (5 of 5) for Isuzu Ascender 2003:

• (lwr left side of eng) g109
• (lwr left side of engine) g109
• 1-2 ss ctrl
• 2-3 ss ctrl
• 4wd low sig
• A/c system
• A12
• Air conditioning system
• Anti-lock brakes system
• Clu rly ctrl
• Cool fan spd
• Cooling fans system
• Crank fuse 10a
• Crank volt
• Css sig
• Ctrl
• Cycle sig
• Delivered torq
• Eng 1 fuse 26 10a
• Engine speed
• Engine speed signal
• Evap canp ctrl
• Evap vent ctrl
• Fuel lev sig
• Fuel press sig
• G108 (lower left side of engine)
• Gen on sig
• Gnd
• Ho2s htr low
• Ho2s low ctrl
• Hot in run & start
• Hot in start
• Iat sig
• Ign
• Ign ctrl
• Ign e fuse 22 10a
• Ign feed
• Ignition coils
• Instrument cluster system
• Instrument panel cluster
• Low ref
• Maf sig
• Malfunction indicator lamp
• Map sig
• Mil ctrl
• Nca
• Nca nca
• Pc sol hi ctrl
• Pc sol lo ctrl
• Pcm 1 fuse 28 10a
• Pmp rly ctrl
• Pnk
• Pnk d
• Powertrain control module (near lower left front of engine)
• Press sens sig
• Prnd c sig
• Red
• Red c
• Ref lo
• Spark plug
• Starting/charging system
• Tan
• Tcc pwm ctrl
• Tcc sol ctrl
• Tft sens sig
• Transmissions system
• Underhood fuse block
• Vss high sig
• Vss low sig
• Vss out