ENGINE PERFORMANCE – Audi A4 2003 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

1.8L

1.8L, Engine Performance Wiring Diagram (1 of 4) for Audi A4 2003

List of elements for 1.8L, Engine Performance Wiring Diagram (1 of 4) for Audi A4 2003:

• (left rear of engine compt) e-box relay panel
• (left side of engine compt) g12
• Accelerator pedal position (app) sensor (above accelerator pedal)
• Brake- light switch
• Clutch vacuum vent valve switch (m/t) (above clutch pedal)
• Cooling fans system
• Fuse 10a
• Fuse 15a
• Fuse 40a
• Fuse panel
• G12 (left side of engine compt)
• Heated oxygen sensor (on exhaust system)
• Hot at all times
• Hot in run or start
• Ignition switch
• Mass airflow (maf) sensor (right side of engine compt)
• Motronic engine control module (in plenum chamber e-box)
• Off
• Oxygen sensor behind twc
• Red
• Run
• Secondary air injection (air) pump relay
• Secondary air injection pump motor
• Start
• Steering column electronic systems control module (top of steering column)
• T16a
• Transmission control module (in plenum chamber e-box)

1.8L, Engine Performance Wiring Diagram (2 of 4) for Audi A4 2003

List of elements for 1.8L, Engine Performance Wiring Diagram (2 of 4) for Audi A4 2003:

• (left front of engine compt) wastegate bypass regulator valve
• (right rear of engine compt) evaporative emission (evap) canister purge regulator valve
• Charge air pressure sensor (behind left headlight)
• Engine coolant temperature (ect) sensor (on radiator)
• Engine speed (rpm) sensor (on rear of engine)
• Fuse 15a
• Fuse holder
• Hot at all times
• Knock sensor (ks) 1 (left rear of engine)
• Knock sensor (ks) 2 (left front of engine)
• Leak detection pump (ldp) (left rear wheelwell)
• Map controlled engine cooling thermostat
• Nca
• Red
• Secondary air injection (air) solenoid valve (bottom of intake manifold)
• Turbocharger recirculating valve (bottom of intake manifold)

1.8L, Engine Performance Wiring Diagram (3 of 4) for Audi A4 2003

List of elements for 1.8L, Engine Performance Wiring Diagram (3 of 4) for Audi A4 2003:

• (left rear of engine compt) e-box relay carrier
• (left side of engine compt)
• (left side of engine compt) brake system vacuum pump
• (mil)
• (rear of cylinder head) engine coolant temperature (ect) sensor
• (right side of master cylinder) brake booster pressure sensor
• Brake booster relay
• Camshaft adjustment valve 1
• Camshaft position sensor (left front of cylinder head)
• Coil
• Data link connector
• Fuse 15a
• Fuse 20a
• Fuse holder
• G12
• G12 (left side of engine compt)
• G18 (on engine block)
• Instrument cluster
• Intake air temperature sensor (near throttle body)
• Malfunction indicator lamp
• Nca
• Red
• T32a/12
• T32a/13
• T32a/23
• To spark plug

1.8L, Engine Performance Wiring Diagram (4 of 4) for Audi A4 2003

List of elements for 1.8L, Engine Performance Wiring Diagram (4 of 4) for Audi A4 2003:

• 150a
• 9-pin relay carrier in instrument panel
• E-box relay carrier
• Fuel injectors
• Fuel pump motor
• Fuel pump relay
• Fuse 15a
• Fuse 20a
• Fuse holder
• G78 (lower right "b" pillar)
• Hot at all times
• Main fuse (on battery positive terminal)
• Motronic engine control module (left rear of engine compt)
• Red
• Relay plate
• Throttle valve control module (on throttle body)
• Transmission control module
• W/ cvt
• W/o cvt

3.0L

3.0L, Engine Performance Wiring Diagram (1 of 4) for Audi A4 2003

List of elements for 3.0L, Engine Performance Wiring Diagram (1 of 4) for Audi A4 2003:

• (left rear of engine compt) e-box relay panel
• (left side of engine compt) g12
• Brake- light switch
• Clutch vacuum vent valve switch (m/t)
• Fuse 10a
• Fuse 15a
• Fuse 40a
• Fuse panel
• G12 (left side of engine compt)
• Heated oxygen sensor (on exhaust system)
• Heated oxygen sensor 2 (on exhaust system)
• Hot at all times
• Hot in run or start
• Ignition switch
• Mass airflow (maf) sensor (right rear of engine compt)
• Motronic engine control module (left rear of engine compt)
• Off
• Oxygen sensor 2 behind twc
• Oxygen sensor behind twc
• Red
• Run
• Secondary air injection (air) pump relay
• Secondary air injection pump motor
• Start
• Steering column electronic systems control module (top of steering column)
• T16a
• Throttle position (tp) sensor (above accelerator sensor)
• Trans- mission control module (left rear of eng compt)

3.0L, Engine Performance Wiring Diagram (2 of 4) for Audi A4 2003

List of elements for 3.0L, Engine Performance Wiring Diagram (2 of 4) for Audi A4 2003:

• (behind right cyl head) engine coolant temperature (ect) sensor
• (front of intake manifold) intake manifold change-over valve
• (on e-box relay carrier) coolant circulation pump relay
• (right rear of engine compt) evaporative emission (evap) canister purge regulator valve
• After-run coolant pump
• Camshaft position sensor 2
• Camshaft position sensor 4 (rear of left cylinder head)
• Engine speed (rpm) sensor (left rear of engine)
• Fuse 15a
• Fuse holder
• G12 (left side of engine compt)
• Hot at all times
• Knock sensor (ks) 1 (under right side of intake)
• Knock sensor (ks) 2 (under left side of intake)
• Leak detection pump (ldp) (left rear wheelwell)
• Nca
• Red
• Secondary air injection (air) solenoid valve (top left rear of engine)

3.0L, Engine Performance Wiring Diagram (3 of 4) for Audi A4 2003

List of elements for 3.0L, Engine Performance Wiring Diagram (3 of 4) for Audi A4 2003:

• (front of left cylinder head) camshaft adjustment valve 2
• (front of right cylinder head) camshaft adjustment valve 1
• (left rear of engine compt) e-box relay carrier
• (left side of engine compt)
• (left side of engine compt) brake system vacuum pump
• (mil)
• (right side of master cylinder) brake booster pressure sensor
• (under left side of dash) data link connector
• Brake booster relay
• Camshaft position sensor
• Camshaft position sensor 3
• Coil
• Fuse 15a
• Fuse 20a
• Fuse holder
• G12
• G12 (left side of engine compt)
• G18 (on engine block)
• Instrument cluster
• Malfunction indicator lamp
• Nca
• Red
• T32a/12
• T32a/13
• T32a/23
• To spark plug

3.0L, Engine Performance Wiring Diagram (4 of 4) for Audi A4 2003

List of elements for 3.0L, Engine Performance Wiring Diagram (4 of 4) for Audi A4 2003:

• 150a
• 9-pin relay carrier in instrument panel
• Cooling fan system
• E-box relay carrier
• Fuel injectors
• Fuel pump motor
• Fuel pump relay
• Fuse 15a
• Fuse 20a
• Fuse holder
• G78 (lower right "b" pillar)
• Hot at all times
• Main fuse (on battery positive terminal)
• Motronic engine control module (left rear of engine compt)
• Red
• Relay plate
• Throttle valve control module (on throttle body)
• Transmission control module (left rear of engine compt)
• W/ cvt
• W/o cvt