A8 Sedan V8-3.7L (AEW) (1997)
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Check wiring for open circuits between relay socket terminal 6 and ECM/test box socket A2.
See Electrical Wiring Diagrams, Troubleshooting and Component Locations.
If there are no open circuits and LED still does not light up:
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Replace ECM and generate new readiness code. See: Testing and Inspection
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Reinstall Motronic ECM power supply relay.
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Disconnect test box and reconnect ECM.
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Switch ignition on.
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Connect VAG 1527 LED voltage tester between engine Ground and upper fuse terminal (fuses for fuel injectors and for EVAP canister purge
regulator valve -N80-).
LED must light up (both fuses supply voltage to one terminal).
If LED does not light for either fuse:
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Check wiring for open circuit between fuses and Motronic ECM power supply relay socket terminal 8.
See Electrical Wiring Diagrams, Troubleshooting and Component Locations.
If there are no open circuits:
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Replace Motronic ECM power supply relay -J271-.
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Reinstall fuses and relay.
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Check readiness code See page 01-47. If DTC memory has been erased, generate new readiness code. See: Testing and Inspection