Golf Mk3
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Self diagnosis
Function
The Mono-Motronic control unit (J257) for the ignition and fuel 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. 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 fault(s) has been eliminated => Page 01-18 . A fault relating to the function of the Lambda control system can only be interrogated after a test drive of at least 10 minutes duration. 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 10 engine starts, it will be erased from the fault memory. |
