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Volkswagen Workshop Service and Repair Manuals

Technical data of self-diagnosis > < Self-diagnosis
Diesel direct injection and glow plug system
Self-diagnosis
Features of self-diagnosis

The control unit for the Diesel direct injection system is equipped with a fault memory.

If faults occur in the sensors and components being monitored, they will be stored in the fault memory together with an indication of the type of fault.

Faults which only occur sporadically will have the addendum "sporadic fault" on the print out. These faults will be indicated on the display by the addendum "/SP". The cause of sporadic faults can be e.g. a loose contact or a brief open circuit. If a sporadic fault does not occur again within 50 engine starts, it will be erased from the fault memory.

If faults are recognized, that affect the driving condition then the glow period warning lamp flashes.

The faults stored can be read-out with the fault reader V.A.G 1551 or the vehicle system tester V.A.G 1552 .

The fault memory must be erased after the faults has been eliminated => Page 01-35 .

Note:

General information for self-diagnosis is in the fault reader V.A.G 1551 and the vehicle system tester V.A.G 1552 instruction manuals.

Technical data of self-diagnosis > < Self-diagnosis