Volkswagen Workshop Service and Repair Manuals

The control unit (J179) for the automatic glow period 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.

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 01-5 .

Faults which can be attributed to a temporary open circuit in the wiring or a loose contact, will also be stored. These faults will be displayed as sporadic faults "SP".

An electrical fault in the glow plug circuit is indicated during the extended glow period (approx. 3 minutes) by the glow period warning lamp flashing.

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.