Passat GLS 4Motion V6-2.8L (ATQ) (2002)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator lamp (MIL), Functional Check
Malfunction Indicator Lamp (MIL), Significance
Special tools and equipment
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VAG1598/31 test box
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VAG1526 multimeter or VAG1715 multimeter
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VAG1594 connector test kit
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Wiring diagram
Test requirements
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Fuses no. 10 and 29 must be OK.
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Battery voltage must be at least 11.5 volts.
Function test:
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Switch ignition on: exhaust MIL must light.
If exhaust MIL does not light when ignition is switched on:
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Check wire from ECM to exhaust MIL as follows:
Cause:
Corrective action:
MIL is not being activated or is not
- Switch ignition off.
lighting due to an open circuit.
- Connect VAG1598/31 test box. Engine Control Module (ECM) is not connected.
- Bridge sockets 2 and 47 of test box.
- Switch ignition on.
Exhaust MIL must light.
If exhaust MIL does not light:
- Switch ignition off.
- Check instrument cluster.
If instrument cluster is OK:
- Locate short circuit or open circuit from ECM to exhaust warning lamp and repair.
If no malfunctions are found in wire to exhaust MIL:
Malfunction cause
ECM faulty, replace ECM.
If exhaust MIL does not light when ignition is switched on, continue test as follows:
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Start engine and let run at idle: exhaust MIL must go out after a few seconds.
If exhaust MIL does not go out:
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Check DTC memory, repair any malfunctions and then erase DTC memory, See Erasing and checking DTC memory.
If there no DTCs are stored:
Cause:
Corrective action:
Malfunction Indicator Lamp (MIL) is
- Switch ignition off.
constantly activated due to a short
circuit to Ground (GND).
- Connect VAG1598/31 test box. Engine Control Module (ECM) is not connected.