Section 150 (MULTIPORT Fuel Injection (MFI) - 4.2L V8 5V - BBD)
WARNING: This page is about a different car, the 2003 Audi S6 and 2002 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
- Multiport Fuel Injection (MFI)
- Motronic injection system, servicing
- Safety precautions
- Rules for cleanliness
- Technical Data (A6 models)
- Technical Data (S6 models)
- Component locations overview
- Wiring and component check with test box VAG 1598/31
- Motronic engine control module (ECM) -J220-, replacing
- Idling speed, checking
- Fuel pressure regulator and holding pressure, checking
- Injection quantity, leakage and spray pattern of injectors, checking
- Injectors, checking
- Fuel Pump (FP) relay -J17- and relay actuation, checking
- Motronic Engine Control Module (ECM) power supply relay -J271-, checking
- Control module power supply, checking
- Mass Air Flow (MAF) sensor -G70-, checking
- Intake Air Temperature (IAT) sensor -G42-, checking
- Engine Coolant Temperature (ECT) sensor -G62-, checking
- Oxygen sensor control, checking
- Function of oxygen sensor control
- Oxygen sensor control and Heated oxygen sensors -G39- and -G108- before catalytic converter, checking
- Notes
- Test conditions
- Functional test
- Meaning of 3 digit readout of display group 30
- Checking oxygen sensor learned values and oxygen sensor control
- If specification is not attained in display zone 1 or display zone 3, or if the value does not fluctuate by at least 2%:
- Evaluation of display group 32
- Evaluation of display group 33
- Oxygen sensor aging and Heated Oxygen Sensors (HO2S) -G39- and -G108-, checking
- Oxygen sensor control and Oxygen Sensors (02S) -G130- and -G131- behind Three Way Catalytic Converter (TWC), checking
- Oxygen sensor heating, checking
- Oxygen sensor signal wiring and actuation, checking
- Notes
- Checking oxygen sensor wiring, Heated Oxygen Sensor (HO2S) -G39-
- Checking oxygen sensor wiring, Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130-
- Checking oxygen sensor wiring, Heated Oxygen Sensor (HO2S) 2 -G108-
- Checking oxygen sensor wiring, Oxygen Sensor (O2S) 2 -G131- Behind Three Way Catalytic Converter (TWC)
- Oxygen sensors, removing and installing
- Intake manifold change-over, checking (A6 models)
- Intake manifold change-over, checking (S6 models)
- Evaporative Emissions (EVAP) system
- Engine Electronic Power Control (EPC), checking
- Function of the electronic throttle system
- Throttle valve control module -J338-, checking
- Throttle valve control module, adaptation
- Angle sensor -1- for throttle drive (power accelerator actuation) -G187- and Angle sensor -2- for throttle drive (power accelerator actuation) -G188-, checking
- Throttle Position (TP) sensor -G79- and Sender 2 for accelerator pedal position -G185-, checking
- Kick down switch point, checking
- Brake light switch -F- and Brake pedal switch -F47-, checking
- Clutch vacuum vent valve switch -F36-, checking
- Additional signals, checking
- Motronic injection system, servicing