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Interrogating and erasing fault memory
Fault table
Notes:
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◆ If faults occur in the monitored sensors and components, these are stored in the fault memory together with an indication of type of fault.
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◆ "Faults related to EPC are additionally indicated by a warning lamp "EPC warning lamp") which is located in the combination instrument, Notes on EPC system =>Page 24-141.
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◆ On vehicles which conform to emission standard EU III, faults which cause deterioration in exhaust emissions are displayed via an exhaust gas warning lamp (fault lamp for self-diagnosis), which is also located in the dash panel insert. Certain faults cause the exhaust gas warning lamp to switch on immediately after detection. However, other faults may occur whereby the exhaust gas warning lamp will only be switched on when the fault is re-detected after two engine re-starts.
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◆ Sporadic faults are marked "SP" (sporadic fault) on the V.A.G 1551 display. The word "sporadic" signifies individually occurring, random faults.
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◆ The fault table is sorted according to the 5 digit fault code on the left.
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◆ If a stored fault does not appear within the next 40 engine starts, the fault code will be automatically erased.
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◆ Do not immediately renew components indicated as faulty by the V.A.G 1551 but First check the wiring and connectors of these components according to the current flow diagram.
Also check the earth connections according to the current flow diagram. This is particularly relevant for faults recorded as "occurring sporadically" (SP).
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◆ If the connector is pulled off the engine control unit or if the battery is disconnected, all the stored values in the control unit will be erased. However, the contents of the fault memory are retained. If the engine is then started, it may run rough for a short period. In this case, the engine should be run at idle for a few minutes until the learning process is concluded.
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