Malfunction Indicator Lamp -K83, Testing

Function test:
- Switch on ignition:
MIL must light up.

If MIL does not light up when ignition is switched on:
- Check wire from ECM to MIL as follows:

Cause: Corrective action:
MIL is not being activated or is not lighting - Switch off ignition.
due to an open circuit. - Connect VAG1598/31 test box. Wiring and Component Testing Using VAG1598/31 Test Box
- Bridge sockets 2 and 47 of test box.
- Switch on ignition.

MIL must light up. If MIL lights up:
Replace Engine Control Module (ECM)

If MIL does not light up:
- Switch off ignition.
- Locate short circuit or open circuit from ECM to MIL (instrument cluster) and repair.

- If no malfunctions are found in wire to MIL:

Malfunction cause - Instrument cluster faulty, replace instrument cluster

If MIL does not light up when ignition is switched on, continue test as follows:
- Start engine and let run at idle:
MIL must go out after a few seconds.

If MIL does not go out:
- Check DTC Memory.

If there no DTCs are stored:

Cause: Corrective action:
Malfunction Indicator Lamp (MIL) is - Switch off ignition.
constantly activated due to a short circuit - Connect VAG1598/31 test box. Wiring and Component Testing Using VAG1598/31 Test Box
to Ground (GND).
- Measure wire resistance between socket 47 of test box and vehicle Ground (GND). Specification: infinite Ohm (Infinity)

If specified value is not obtained:
Short circuit to Ground (GND) in activation wire from ECM to MIL.
- Locate malfunction using wiring diagram and repair.

If specified value of infinite Ohm is obtained, and no short circuit to Ground (GND) is found:

Malfunction cause Engine Control Module (ECM) faulty replace ECM.