Section 179 (MULTIPORT Fuel Injection (MFI) - 4.2L V8 - Art, Awn)
WARNING: This page is about a different car, the 2004 Audi A6, 2003 Audi A6, 2002 Audi A6, 2001 Audi A6, and 2000 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
- Multiport Fuel Injection (MFI)
- Motronic Multiport Fuel Injection (MFI) system, servicing
- Safety precautions
- Rules for cleanliness
- Technical data
- Component locations, overview
- Wiring and components, checking with VAG 1598/31 test box
- Motronic Engine Control Module (ECM) -J220- (without metal anti-theft housing), replacing
- Motronic Engine Control Module (ECM) -J220- (with metal anti-theft housing), replacing
- Motronic Engine Control Module (ECM) Power Supply Relay -J271-, checking
- Notes
- Test conditions
- Checking activation of the ECM power supply relay
- Checking voltage supply for ECM power supply relay
- Activating Cruise Control System (CCS)
- Idle speed, checking
- Fuel pressure regulator and residual fuel pressure, checking
- Fuel injection volume, fuel injector leakage and spray pattern of fuel injectors, checking
- Fuel injectors, checking
- Fuel Pump (FP) Relay -J17- and relay activation, 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 and oxygen sensor control before Three Way Catalytic Converter (TWC), checking
- Special tools and shop equipment
- Test conditions
- Checking function
- Significance of 3 digit indication in Display Group 030
- Checking oxygen sensor adaptation and oxygen sensor control
- If the specified values in display fields 1 and/or 3 do not match the specifications, or if the readout does not fluctuate by at least 2 %:
- Evaluation display group 032
- Evaluation display group 033
- Oxygen sensors aging, oxygen sensor before catalytic converter, checking
- Oxygen sensor and oxygen sensor control after catalytic converter, checking
- Oxygen sensor heater, checking
- Oxygen sensor signal wire and activation, checking
- Notes
- Checking oxygen sensor wiring for Heated Oxygen Sensor (HO2S) -G39-
- Checking wiring for Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130-
- Checking wiring for Heated Oxygen Sensor (HO2S) 2 -G108-
- Checking wiring for Oxygen Sensor (O2S) 2 after Three Way Catalytic Converter (TWC) -G131-
- Heated Oxygen Sensors (HO2S), removing and installing
- Intake manifold change-over, checking
- Evaporative Emission (EVAP) system, checking
- Secondary Air Injection (AIR) Solenoid Valve -N112-, checking
- Electronic Engine Power Control (EPC) malfunction indicator light, checking
- Function of electronic throttle system
- Throttle Valve Control Module -J338-, checking
- Adaptation of throttle valve control module, performing
- Angle sensor 1 for throttle drive (power accelerator actuation) -G187- and Angle sensor 2 for throttle drive (power accelerator actuation) -G188-, checking
- Significance of electronic Engine Power Control (EPC) malfunction indicator light in instrument cluster
- Throttle Position (TP) Sensor -G79- and Sender 2 for accelerator pedal position -G185-, checking
- Additional signals, checking
- Engine Speed (RPM) signal, checking
- Fuel consumption signal, checking
- Vehicle Speed Sensor (VSS) signal, checking
- Fuel level signal, checking
- A/C compressor shut-off, checking
- Crash signal, checking
- Engine mounts, checking
- Data exchange between Engine Control Module (ECM), ABS/EDL Control Module, Transmission Control Module (TCM), checking
- Motronic Multiport Fuel Injection (MFI) system, servicing