Malfunction Indicator Lamp (MIL), Checking

Check Malfunction Indicator Lamp (MIL) in instrument cluster

Installation position of exhaust MIL

Version A







Version B







Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirement






- The respective fuses of Malfunction Indicator Lamp (MIL) -K83- must be OK.

Test sequence

- Switch on ignition:
exhaust MIL must light up.

If exhaust MIL does not light up when ignition is switched on:
- Switch ignition off.
- Check wire from ECM to exhaust MIL as follows:
- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test

- Bridge sockets 2 + 47 of test box with the respective adapter cables.
- Switch on ignition:
exhaust MIL must light up.

If Malfunction Indicator Lamp (MIL) does not light up:
- Switch ignition off.
- Remove instrument cluster
- Check wire connection from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL) -K83- according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
Clearing Diagnostic Trouble Codes

- Generate readiness code.
Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL):
- Replace Motronic Engine Control Module (ECM) -J220-.

If exhaust MIL lights up when ignition is switched on:
- Start engine and let run at idle:
Exhaust MIL must go out after a few seconds.

If Malfunction Indicator Lamp (MIL) does not go out:
- Switch ignition off.
- Remove instrument cluster.
- Connect test box to control module wiring harness, connect test box for wiring test.
Test Box, Connecting For Wiring Test

- Check wire connection between test box socket 47 and instrument cluster for short circuit to Ground (GND) according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
Clearing Diagnostic Trouble Codes

- Generate readiness code.
Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are detected in wire from Engine Control Module (ECM) to Malfunction Indicator Lamp (MIL):
- Replace Motronic Engine Control Module (ECM) -J220-.