Malfunction Indicator Lamp (MIL) function test
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
- Switch ignition on.
- Engine Control Module (ECM) switches EPC lamp on.
- Start engine.
- Shortly after engine is started, the EPC warning lamp will go out if there are no malfunctions stored in DTC memory that relate to the E-gas system
If warning lamp does not light up at all:
The switch-on signal for Malfunction Indicator Lamp (MIL) is transferred from the Engine Control Module (ECM) to the instrument cluster via wire connection or via CAN-Bus, depending on version.
- Checking wire connections
See appropriate System Wiring Diagram article.
- Check terminal resistance for CAN-Bus. See TERMINAL RESISTANCE FOR CAN-BUS, CHECKING .