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 MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLERELAYS AND MODULES - A/TCONTROL MODULETESTING AND INSPECTION
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Control Module: Testing and Inspection
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Testing and Inspection
NOTE: This check is to be conducted if either the output Diagnostic Test Mode (DTM) or electrical testing indicates a malfunction in the wiring between the transmission and the Transmission Control Module (TCM) -J217-.
Test Requirements
- Ignition switched OFF
- Test box VAG 1598/20, or equivalent, connected to 88-pin transmission wiring harness connector
- Remove noise insulation.
Checking Wiring Connection To 16-pin Connector On Transmission
- Unlock bayonet lock -4- of 16-pin connector to transmission by turning it (remove bracket -1- for noise insulation if necessary).
- Check wiring connections for continuity (using multimeter) between terminals of 16-pin connector and sockets of test box VAG 1598, using the following connector pin specification table.
Checking Wiring To 8-pin Connector For Multi-function Switch
- Remove spring-clip lock -2- from harness/multi-function switch connector.
- Check wiring connections for continuity (using multimeter) between terminals of 8-pin connector and sockets of test box VAG 1598, using the following connector pin specification table.
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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.