Functional check
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.
- Switch ignition on. EPC warning lamp must light up.
If EPC warning lamp does not light up with the ignition switched on:
- Check EPC lamp wiring/EPC lamp bulb using wiring diagram.
If OK:
- Check instrument cluster/ECM, and replace if necessary.
- Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05) .
- Read readiness code → Readiness code (function 15), displaying . If DTC memory has been erased, readiness code must be generated again → Readiness code (function 15), generating .
If EPC warning lamp lights up with the ignition switched on, continue check as follows:
- Start engine and run at idle. EPC warning lamp must go out after a few seconds.
If EPC warning lamp does not go out:
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05) .
If no DTCs are stored:
- Check EPC lamp wiring using wiring diagram.
If OK:
- Check instrument cluster/ECM, and replace if necessary.
- Check DTC memory; if necessary, repair any malfunctions and then erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05) .
- Read readiness code → Readiness code (function 15), displaying . If DTC memory has been erased, readiness code must be generated again → Readiness code (function 15), generating .