Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI199590 QUATTRO SPORT V6-2.8L (AAH)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONGENERAL
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
General
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION General
OPERATION
The Engine Control Module (ECM) processes input signals, filters out stray signals and sends the results to the operating components of the fuel injection and ignition systems.
The ECM also provides for self-diagnosis of the Multi-Point Fuel Injection (MFI) system. The MFI system is adaptive or self-learning. The ECM learns continuously by using a sophisticated feedback system to constantly readjust the various basic control settings. These values are then stored in its electronic memory.
The adaptive capability allows the ECM to compensate for changes in the engine's operating conditions, such as altitude changes, intake leaks or other deviations.
If the vehicle battery or MFI ECM is disconnected, the vehicle must be driven for a few minutes so the MFI unit can "re-learn" its operating conditions.
The ECM also provides information signals to other systems as required.
- Engine speed signal to the Tachometer
- Fuel consumption signal to the Trip Computer
The Engine Control Module (ECM) processes input signals, filters out stray signals and sends the results to the operating components of the fuel injection and ignition systems.
The ECM also provides for self-diagnosis of the Multi-Point Fuel Injection (MFI) system. The MFI system is adaptive or self-learning. The ECM learns continuously by using a sophisticated feedback system to constantly readjust the various basic control settings. These values are then stored in its electronic memory.
The adaptive capability allows the ECM to compensate for changes in the engine's operating conditions, such as altitude changes, intake leaks or other deviations.
If the vehicle battery or MFI ECM is disconnected, the vehicle must be driven for a few minutes so the MFI unit can "re-learn" its operating conditions.
The ECM also provides information signals to other systems as required.
- Engine speed signal to the Tachometer
- Fuel consumption signal to the Trip Computer
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.