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 the EPC warning lamp does not light up with the ignition switched on:
- Check wiring from Motronic Engine Control Module (ECM) J220 to EPC warning lamp as follows:
| Cause: | Corrective Action: | |
| EPC warning lamp is not activated or does not light up due to open circuit. |
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| If wiring to EPC warning lamp is OK: | ||
| Malfunction cause | → | Motronic ECM J220 is faulty.
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If the 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 the 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:
| Cause: | Corrective Action: | |
| EPC warning lamp is permanently activated by short to Ground (GND). |
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| If specification infinite Ohm (∞ Ω)~ is obtained and no short to Ground (GND) can be found: | ||
| Malfunction cause | → | Motronic ECM J220 malfunctioning.
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- Display readiness code → Readiness code (function 15), displaying .
If DTC memory has been erased, the readiness code must be generated again → Readiness code (function 15), generating .