| Properties of the self-diagnosis |
| The engine control unit is equipped with a fault memory. The fault memory is designed as a permanent memory and as a volatile memory. |
| If malfunctions occur in the monitored sensors or components, they are stored in the fault memory with indication of the fault type. |
| The engine control unit analyses the fault information → Chapter and stores this fault until the fault memory content is erased. |
| Faults which occur only occasionally (sporadically), are marked as “sporadic” with the suffix “SP”. Possible causes of sporadic faults are e.g. a loose contact or a momentary line interruption. If a sporadic fault no longer occurs after 50 engine starts, it is automatically erased from the fault memory. |
| The stored faults can be read out with the diagnostic unit -V.A.G 1552- or -V.A.G 1551-, or -VAS 5051- → Chapter. |
| After the fault(s) has(have) been removed the fault memory must be erased → Chapter. |
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| The following description applies only for vehicle system tester -V.A.G 1552- used in combination with program card version 5.0. |
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| If “Info in literature” appears in the display of the vehicle system tester, look for the text required in the fault table under the fault code. |
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| The use of fault read-out scan tool -V.A.G 1551- (with program card version 8.0) with integrated printer or - VAS 5051- is similar. A minor deviation on the display read-out is possible. |
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