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 SYSTEMSDATA LINK CONNECTORTESTING AND INSPECTION
1995 Audi 90 Quattro Sport V6-2.8L (AAH)
Data Link Connector: Testing and Inspection
1995 Audi 90 Quattro Sport V6-2.8L (AAH)SECTION Testing and Inspection
PROCEDURE
- Check for voltage supply at Data Link Connector (DLC) A (Black) in vehicle, observe polarity while performing this check:
^ Terminal 1 goes to Battery negative (-)
^ Terminal 2 goes to Battery positive (+) (fuse 19)
- If battery voltage is not obtained, check wiring using wiring diagram, repair or replace as necessary.
- Check wiring for continuity between ECM and DLC.
DLC connector B (White)
^ Terminal 1 goes to C 13 of the ECM
^ Terminal 2 goes to C 12 of the ECM
DLC connector C (Blue)
^ Terminal 2 goes to C 14 of the ECM
- If there is no continuity, check wiring using wiring diagram, repair or replace as necessary.
- Check for voltage supply at Data Link Connector (DLC) A (Black) in vehicle, observe polarity while performing this check:
^ Terminal 1 goes to Battery negative (-)
^ Terminal 2 goes to Battery positive (+) (fuse 19)
- If battery voltage is not obtained, check wiring using wiring diagram, repair or replace as necessary.
- Check wiring for continuity between ECM and DLC.
DLC connector B (White)
^ Terminal 1 goes to C 13 of the ECM
^ Terminal 2 goes to C 12 of the ECM
DLC connector C (Blue)
^ Terminal 2 goes to C 14 of the ECM
- If there is no continuity, check wiring using wiring diagram, repair or replace as necessary.
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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.