A8 Sedan V8-3.7L (AEW) (1997)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator Lamp (MIL) Functional, Checking
Malfunction Indicator Lamp (MIL) Function, Checking
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Switch ignition on.
MIL must light up.
If MIL does not light:
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Switch ignition off.
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Connect VAG1598/19 test box to ECM harness connector and connect jumper wire between sockets 09 and D11 (Ground). Refer to "Scan Tool
Testing/Scan Tool Connecting and Initial Checks/VAG1598/19 Test Box, Connecting" See: Testing and Inspection
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Switch ignition on.
MIL must light up.
If MIL now lights (with jumper wire connected):
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Replace Engine Control Module (ECM).
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Generate readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See: Testing and
Inspection
If MIL still does not light:
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Switch ignition off.
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Check MIL bulb.
If MIL bulb is OK:
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Check wiring for open or short circuit between ECM/test box socket C9 and instrument cluster.
If wiring is OK:
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Check voltage supply from instrument cluster.
If the MIL lights up when the engine is running, and only P1690/18098 is stored in DTC memory:
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Stop engine (switch ignition off).
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Disconnect ECM harness connector.
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Switch ignition on.
If MIL stays on:
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Check wiring for short circuit to Ground between ECM connector terminal C9 and instrument cluster.