Possible Causes of Fault

Possible fault causes

NOTE: This is where the 'Possible fault causes' leading to the fault are listed. Please bear in mind that additional faults may be stored in the memory after troubleshooting under certain circumstances (e.g. if plug connections are disconnected). After repairing the vehicle, read out the fault memories of all control modules and erase all faults that were added during troubleshooting or repairs.

Faulty DME

NOTE:
- Faulty control modules are extremely rare. Although almost every fault can theoretically also be caused by a faulty control module, past experience has shown that, for DME control modules in particular, even control modules sent in for inspection turned out to be OK.
- We would again like to stress the necessity of thoroughly examining all other possible fault causes before replacing a DME control module (this is the last logical step at the end of a fruitless troubleshooting procedure). If necessary, the fault entry must be deleted and a test drive or short test must be performed.
- If further faults have been recorded, these are to be remedied first according to instructions (example: a fault in the inlet camshaft can, under certain circumstances, cause an oxygen sensor fault to be issued).
- CAN timeout fault entries are critical faults which, when they occur alone, are not necessarily caused by a malfunction. Instead, these CAN timeout faults are intended to provide additional information when other faults (even 'non-CAN faults') are recorded or when functions are impaired.
- Fault entries that are connected only with troubleshooting, repairs or the programming of control modules (e.g. CAN timeout errors) must be erased.