Malfunction Indicator Lamp (MIL), Checking

Malfunction Indicator Lamp (MIL), Checking

Special tools, test equipment and auxiliary items
- Test box V.A.G 1598/31
- Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
- Adapter set V.A.G 1594
- Wiring diagram

Check conditions







- Fuses 10 and 29 must be OK
- The battery voltage must be at least 11.5 V

Functional check:
- Switch on ignition:
Malfunction Indicator Lamp (MIL) must light-up.

If the Malfunction Indicator Lamp (MIL) does not light-up with ignition switched on:
- Check wiring from engine control module to Malfunction Indicator Lamp (MIL) as follows:







If the MIL lights-up with ignition switched on, continue check as follows:
- Start engine and run at idle speed:
The MIL must go out after a few seconds.

If the MIL does not go out:
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory. Refer to "DTC Memory, Checking And Erasing" under "Computers and Control Systems/Testing and Inspection/Procedures/Displaying, Reading and Erasing Trouble Codes/With Manufacturers Scan Tool/", Testing and Inspection

If no DTC is stored:







- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again.
Refer to "Displaying Readiness Code" under "Computers and Control Systems/Testing and Inspection/Procedures/Monitors Trips and/or Drive Cycle/", Testing and Inspection
Refer to "Generating Readiness Code" under "Computers and Control Systems/Testing and Inspection/Procedures/Monitors Trips and/or Drive Cycle/", Testing and Inspection