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 DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCAN-BUS DATA EXCHANGE BETWEEN MOTRONIC ECM AND AUTOMATIC TCM
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
CAN-Bus Data Exchange Between Motronic ECM and Automatic TCM
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION CAN-Bus Data Exchange Between Motronic ECM and Automatic TCM
CAN-bus Data Exchange Between Motronic ECM And Automatic Transmission TCM, Checking
- Check Diagnostic Trouble Code (DTC) memory for Transmission Control Module (TCM).
- Switch ignition off.
- Connect VAG1598/19 test box to ECM harness connector. Refer "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19 Test Box, Connecting" Testing and Inspection
- Check wiring for open or short circuit between TCM and ECM/test box sockets A9 and A10.
If wiring is OK:
- Temporarily replace ECM and/or TCM.
- Generate readiness code. Refer "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" Testing and Inspection
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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.