Description of On-Board Diagnostics

Diagnosis, Fault Memory - Passat

CIS-E Motronic, self-diagnosis

The procedures in this section apply to the following control units ONLY:
893 907 E, F, L, AND M

The CIS-E Motronic control unit (J 204) features Self-Diagnosis (SD) capability. If problems occur at monitored sensors or components, they are stored in Fault memory.

The self diagnosis must be initiated and the stored fault(s) recalled with the tester VAG 1551. The VAG 1551 tester can tap into the Motronic ECU memory via remote diagnostic terminals beneath the center console in front of the shift lever.

Faults that occur only occasionally are stored as sporadic faults.

CAUTION! Faults related to emissions and safety are stored in a permanent memory which must be intentionally erased after faults have been eliminated or repaired.

The CIS-E Motronic control unit is also equipped with an output check diagnosis function.