A6 Quattro Sedan V6-2.8L (AHA) (1998)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator Lamp (MIL) functional, check
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Switch ignition on.
MIL must light UP.
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If MIL does not light when ignition is switched on, check wiring to MIL as follows.
Cause:
MIL is not triggered, or does not light, due to faulty wiring or open circuit.
Corrective action:
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Switch ignition off.
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Connect VAG 1598/22 test box
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Connect jumper wire to bridge test box sockets 2 and 17.
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Switch ignition on.
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MIL must light up.
If MIL does not light:
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Switch ignition off.
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Check bulb for MIL.
If bulb is OK:
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Check wiring for open circuit between MIL and Motronic ECM -J220- using applicable wiring diagram.
If wiring is OK:
Malfunction:
Motronic ECM -J220- is faulty; Check and erase Diagnostic Trouble Code (DTC) memory and generate new readiness code. Refer to "Scan Tool
Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" See: Testing and Inspection
If MIL lights up when ignition is switched on, continue checking as follows:
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Start engine and let run at idle.
MIL must go out after a few seconds.
If MIL does not go out:
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Check Diagnostic Trouble Code (DTC) memory.
If there are no malfunctions stored in DTC memory:
Cause:
MIL is triggered continuously due to short circuit to Ground.
Corrective action:
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Switch ignition off.
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Connect VAG 1598/22 test box.
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Check resistance between test box socket 17 and vehicle Ground, specified value: Infinity Ohms (no continuity)
If the specified value is not obtained:
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Check for short circuit to Ground in wiring from Motronic Engine Control Module (ECM) -J220- to MIL.
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Trace malfunction using applicable wiring diagram and repair as necessary.
If there is no continuity, and no short circuit to Ground:
Malfunction:
Motronic ECM -J220- is faulty; replace. Check and erase Diagnostic Trouble Code (DTC) memory and generate new readiness code.Refer to "Moniters,
Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code See: Testing and Inspection