Functional check
WARNING: This page is about a different variant/trim than selected.
- 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 .