Malfunction Indicator Lamp (MIL), significance
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Checking MIL (through m.y.1999)
→ Malfunction Indicator Lamp (MIL) (through m.y. 1999), checking
Checking MIL (from m.y. 2000)
→ Malfunction Indicator Lamp (MIL) (from m.y. 2000), checking
If malfunctions are recognized by the Motronic Engine Control Module (ECM) J220 , the Malfunction Indicator Lamp (MIL) will be switched on. In vehicles from m.y. 2000, this is done by a signal sent by the ECM to the instrument cluster
Location of Malfunction Indicator Lamp (MIL)
NOTE:
- The MIL can switch on in the "flashing" or "permanently on" mode. DTC memory must be checked in every case → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05) .
- Flashing: There is a malfunction which can cause damage to the Three Way Catalytic Converter (TWC) if driven in this condition. In this case, the vehicle must not be driven using full performance!
- Permanently on: There is a malfunction which will increase exhaust emissions. Check DTC memory of the Motronic ECM and/or Automatic Transmission Control Module (TCM).
- If the MIL does not light up even though there is an engine running problem, or a customer has complained, DTC memory must be checked, because malfunctions which do not switch the MIL on immediately can also be stored.