Leon Mk1
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General to self-diagnosis
Features of self-diagnosis
The engine control unit (Motronic control unit J220) 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 engine control unit, after evaluating the information differentiates between various fault codes => Fault table page 01-32 and stores these until the fault memory contents are erased. 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 40 warm-up phases (engine start below 50° C coolant temperature - switched off above 72° C), it will be erased from the fault memory. 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 01-10. All values learnt by the engine control unit will be erased when the engine control unit connector is pulled off or the battery is disconnected. However the contents of the fault memory are attained. When the engine is subsequently started the idling could be rough for a brief period. In this case leave the engine running for a few minutes at idling speed or perform a longer test drive, until the learning process is completed. 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. |
