ENGINE PERFORMANCE – Subaru Impreza WRX STi 2008 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

2.5L

2.5L, Engine Performance Wiring Diagram (1 of 4) for Subaru Impreza WRX STi 2008

List of elements for 2.5L, Engine Performance Wiring Diagram (1 of 4) for Subaru Impreza WRX STi 2008:

• (on right fuse & relay box) electronic throttle control relay
• (on right fuse & relay box) ig relay
• (on right fuse & relay box) main relay
• (on right fuse & relay box) oxygen (a/f) sensor relay
• (top center of engine) ge-1
• B134
• B137
• B186
• Engine control module (behind right side of dash)
• Fuse 15a
• Ge-1 (top center of engine)
• Hot at all times
• Left oil switching solenoid valve (left rear of engine)
• Left vvl diagnosis oil pressure switch (left front of engine)
• Main fuse box (m/b) (left rear of engine compt)
• Nca
• Oil temperature sensor (top right side of engine)
• Pcv diagnosis connector
• Pnk
• Power steering oil pressure switch (at right front of engine)
• Red
• Right oil switching solenoid valve (right rear of engine)
• Right vvl diagnosis oil pressure switch (right front of engine)

2.5L, Engine Performance Wiring Diagram (2 of 4) for Subaru Impreza WRX STi 2008

List of elements for 2.5L, Engine Performance Wiring Diagram (2 of 4) for Subaru Impreza WRX STi 2008:

• (top of fuel tank) fuel pump
• B52
• Combination meter
• Drive circuit
• Ect nd
• Ect warning light
• Engine coolant temp gauge
• Front oxygen (a/f) sensor (front of front catalytic converter)
• Fuel pump
• Fuel pump relay (on right fuse & relay box)
• Fuel temp sensor
• Fuse & relay box (f/b)
• Fuse 15a
• Gb-11
• Gb-7 (near right "c" pillar)
• Ge-1 (top center of engine)
• Hot at all times
• Hot in on or start
• I/f
• Ignition coil & ignitor assembly (top right side of engine)
• J/c i97 (behind left side of dash)
• Micro computer
• Mil ind
• Nca
• Oil pressure
• Oil pressure switch (on front of engine)
• Pnk
• Power circuit
• Purge control solenoid valve (on intake manifold)
• R168
• Rear oxygen sensor (rear of transmission)
• Red
• Right fuse & relay block (f/b) (behind right side b220 of dash)
• Speedo- meter
• Tacho- meter
• Warning light

2.5L, Engine Performance Wiring Diagram (3 of 4) for Subaru Impreza WRX STi 2008

List of elements for 2.5L, Engine Performance Wiring Diagram (3 of 4) for Subaru Impreza WRX STi 2008:

• (behind left side of dash) accelerator pedal position sensor
• (behind right side of dash) j/c b122
• (behind right side of dash) j/c b83
• (right side of engine compt) mass air flow sensor
• (top of fuel tank) fuel tank pressure sensor
• (under left side of dash) data link connector
• B440
• B442
• B75
• B76
• Drain valve (under left rear of vehicle)
• Egr solenoid valve (rear of engine)
• Electronic throttle control (at throttle body)
• Engine coolant temperature sensor (on top center of engine)
• Manifold absolute pressure sensor (top rear of engine)
• Multi j/c b440 & b442 (behind left side of dash)
• Nca
• Pnk
• Pressure control solenoid valve (under center rear of vehicle)
• Red
• Test mode connector

2.5L, Engine Performance Wiring Diagram (4 of 4) for Subaru Impreza WRX STi 2008

List of elements for 2.5L, Engine Performance Wiring Diagram (4 of 4) for Subaru Impreza WRX STi 2008:

• (at left front of engine) fuel injector 2
• (at left rear of engine) fuel injector 4
• (at right front of engine) fuel injector 1
• (at right rear of engine) fuel injector 3
• (manual a/c)
• (top center of engine) ge-1
• Air conditioning system
• Anti-theft system
• B135
• B136
• B145
• B186
• Camshaft position sensor (on left front of engine)
• Computer data lines system
• Cooling fans system
• Crankshaft position sensor (on lower front of engine)
• Cruise control system
• Engine control module (behind right side of dash)
• Fuse 7.5a
• Ge-2 (top center of engine)
• Hot at all times
• J/c b138 (behind right side of dash)
• Knock sensor (at center rear of engine)
• Main fuse box (m/b) (left rear of engine compt)
• Nca
• Pnk
• Red
• Sbf 5 fuse 30a
• Sbf 7 fuse 30a
• Starting/ charging system
• Starting/charging system

2.5L TURBO

2.5L Turbo, Engine Performance Wiring Diagram (1 of 5) for Subaru Impreza WRX STi 2008

List of elements for 2.5L Turbo, Engine Performance Wiring Diagram (1 of 5) for Subaru Impreza WRX STi 2008:

• (behind left side of dash) multi j/c b440 & b442
• (behind right side of dash) j/c b122
• (turbo: top left of engine) (ho turbo: top right side of engine) ge
• (under left side of dash) data link connector
• Accelerator pedal position sensor (behind left side of dash)
• Air conditioning system
• Anti-theft system
• B135
• B136
• B440
• B442
• B76
• Computer data lines system
• Cooling fans system
• Cruise control system
• Delevery test mode connector b75
• Electronic throttle control relay (on right fuse & relay box)
• Engine control module (behind right side of dash)
• Fuel tank pressure sensor (top of fuel tank)
• Fuse 15a
• J/c b83 (behind right side of dash)
• Mass air flow flow & intake air temperature sensor (right side of engine compt)
• Nca
• Pnk
• Red
• Right fuse & relay block (f/b) (behind right side b220 of dash)
• Starting/ charging system
• Starting/charging system
• Wrx sti

2.5L Turbo, Engine Performance Wiring Diagram (2 of 5) for Subaru Impreza WRX STi 2008

List of elements for 2.5L Turbo, Engine Performance Wiring Diagram (2 of 5) for Subaru Impreza WRX STi 2008:

• (near right "c" pillar)
• (on right fuse & relay box) main relay
• (on right fuse & relay box) oxygen (a/f) sensor relay
• B145
• B186
• Combination meter
• Drain valve (under left rear of vehicle)
• Drive circuit
• Engine coolant
• Engine coolant temperature gauge
• Fuel pump (top of fuel tank)
• Fuel pump control unit (sedan: right rear of trunk) (wagon: behind right rear quarterpanel)
• Fuel pump relay (on right fuse & relay box)
• Fuel temp sensor
• Fuse 15a
• Fuse 7.5a
• Fuse sbf-5 30a
• Fuse sbf-7 30a
• Gb-11 (under center console)
• Gb-3 (behind right end of dash)
• Gb-7
• Hot at all times
• I/f
• J/c i97 (behind left side of dash)
• M/t
• Main fuse box (m/b) (left rear of engine compt)
• Malfunction ind light
• Micro computer
• Nca
• Oil pressure
• One step dimmer circuit
• Power circuit
• Pressure control solenoid valve (on intake manifold)
• Red
• Speedo- meter
• Tacho- meter
• Temp ind
• Up ind shift
• Warning ind

2.5L Turbo, Engine Performance Wiring Diagram (3 of 5) for Subaru Impreza WRX STi 2008

List of elements for 2.5L Turbo, Engine Performance Wiring Diagram (3 of 5) for Subaru Impreza WRX STi 2008:

• (or red)
• (turbo: top left of engine) (ho turbo: top right side of engine) ge
• B143
• B144
• B52
• F37
• Front oxygen (a/f) sensor (front of front catalytic converter)
• Fuse & relay box (f/b)
• Fuse 10a
• Fuse 15a
• Fuse 60a
• Hot at all times
• Hot in on or start
• J/c b138 (behind right side of dash)
• Left & right secondary air combination valve (left rear of engine)
• Main fuse box (m/b) (left rear of engine compt)
• Nca
• Oil pressure switch (on front of engine)
• Purge control solenoid valve 2 (on intake manifold)
• R168
• Rear oxygen sensor (rear of transmission)
• Red
• Secondary air combination valve relay 1
• Secondary air combination valve relay 2
• Secondary air fuse & relay box (left rear of engine compt)
• Secondary air pump (left front of engine compt)
• Secondary air pump relay
• Wastegate control solenoid (right rear of engine)
• Wrx
• Wrx sti

2.5L Turbo, Engine Performance Wiring Diagram (4 of 5) for Subaru Impreza WRX STi 2008

List of elements for 2.5L Turbo, Engine Performance Wiring Diagram (4 of 5) for Subaru Impreza WRX STi 2008:

• (at left front of engine) ignition coil 2
• (at left rear of engine) ignition coil 4
• (at right front of engine) ignition coil 1
• (at right rear of engine) ignition coil 3
• (left front of engine) left intake oil flow control solenoid valve
• (or red)
• (right front of engine) right intake oil flow control solenoid valve
• Crankshaft position sensor (on lower front of
• Engine)
• Ge (ho turbo: top right side of engine) (turbo: top left of engine)
• Knock sensor (on rear of engine)
• Leak diagnosis connector
• Left camshaft position sensor (right rear of engine)
• Left exhaust oil flow control solenoid valve (wrx sti) (left front of engine)
• Manifold absolute pressure sensor (top rear of engine)
• Nca
• Purge control solenoid valve 1 (on intake manifold)
• Red
• Right camshaft position sensor (left rear of engine)
• Right exhaust oil flow control solenoid valve (wrx sti) (right front of engine)

2.5L Turbo, Engine Performance Wiring Diagram (5 of 5) for Subaru Impreza WRX STi 2008

List of elements for 2.5L Turbo, Engine Performance Wiring Diagram (5 of 5) for Subaru Impreza WRX STi 2008:

• (at left front of engine) fuel injector 2
• (at left rear of engine) fuel injector 4
• (at right front of engine) fuel injector 1
• (at right rear of engine) fuel injector 3
• (ho turbo: top right side of engine) (turbo: top left of engine) ge
• (or red)
• (wrx sti)
• (wrx)
• B134
• B137
• Electronic throttle control (at throttle body)
• Engine control module (behind right side of dash)
• Engine coolant temperature sensor (top left front of engine)
• Ge (ho turbo: top right side of engine) (turbo: top left of engine)
• Left tgv assembly (at left rear of engine)
• Nca
• Pnk
• Power steering oil pressure switch (right front of engine)
• Red
• Right secondary air combination valve (wrx: right rear of engine) left secondary air combination valve (wrx sti: rear of engine)
• Right tgv assembly (at right rear of engine)