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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIR
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Engine Control Module: Service and Repair
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Service and Repair
Removing
- Switch ignition OFF.
CAUTION!:
BEFORE disconnecting the ECM harness connector, switch the ignition OFF and WAIT at least 30 seconds. Failure to do so may damage the ECM.
- Remove cover from lower right A-pillar.
- Pull back carpeting in right front foot well.
- Remove screws (arrows) from electronics box cover.
- Carefully pull upper and lower cover out of electronics box.
- Disconnect ECM from electronics box.
- Carefully remove brace -3- along with attached parts.
- Remove screws (arrows) securing ECM to electronics box.
- Remove ECM from electronics box and remove ECM connectors.
Installing
- Ensure that ignition is switched OFF.
CAUTION!:
DO NOT connect ECM with ignition switched ON.
- Connect ECM harness connectors to ECM.
- Install screws (arrows) securing ECM to electronics box.
- Carefully install brace -3- along with attached parts.
- Carefully install lower cover onto electronics box so that tabs engage slots.
- Carefully install upper cover onto electronics box so that tabs engage slots.
- Screw both covers of electronics box to each other.
- Cover electronics box with carpeting again.
- Reinstall A-pillar cover.
- Switch ignition OFF.
CAUTION!:
BEFORE disconnecting the ECM harness connector, switch the ignition OFF and WAIT at least 30 seconds. Failure to do so may damage the ECM.
Trim Panel Removal:
- Remove cover from lower right A-pillar.
- Pull back carpeting in right front foot well.
Panel Screw Locations:
- Remove screws (arrows) from electronics box cover.
- Carefully pull upper and lower cover out of electronics box.
- Disconnect ECM from electronics box.
Brace:
- Carefully remove brace -3- along with attached parts.
- Remove screws (arrows) securing ECM to electronics box.
- Remove ECM from electronics box and remove ECM connectors.
Installing
- Ensure that ignition is switched OFF.
CAUTION!:
DO NOT connect ECM with ignition switched ON.
- Connect ECM harness connectors to ECM.
- Install screws (arrows) securing ECM to electronics box.
Brace:
- Carefully install brace -3- along with attached parts.
Central Electronics Box:
- Carefully install lower cover onto electronics box so that tabs engage slots.
Central Electronics Box:
- Carefully install upper cover onto electronics box so that tabs engage slots.
- Screw both covers of electronics box to each other.
- Cover electronics box with carpeting again.
- Reinstall A-pillar cover.
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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.