Volkswagen Workshop Service and Repair Manuals > Golf Mk5 > Power unit | 4-cylinder diesel engine (2.0 l engine, 2-valve, SDI) | Fuel preparation system Diesel injection | Engine control unit | Reading and erasing engine control unit fault memory

Reading and erasing engine control unit fault memory

Special tools and workshop equipment required

t	Vehicle diagnosis, testing and information system -VAS 5051-

t	Diagnosis cable -VAS 5051/6A-

Procedure

–	Connect vehicle diagnosis, testing and information system -VAS 5051- as follows:

–	Connect diagnosis cable -VAS 5051/6A- as shown to diagnosis connection.

–	Start engine and run at idling speed.

Only if engine does not start

–	Switch on ignition.

Select operating mode:

–	Press button on display for “Vehicle self-diagnosis”.

Select vehicle system:

–	Press button “01 - Engine electronics” on display.

The control unit identification and coding are indicated on the display.

Select diagnostic function:

–	Press button “02 - Interrogate fault memory” on display.

–	If no fault is stored in engine control unit “0 fault(s) detected” is displayed.

–	If faults are stored in the engine control unit, these are shown one below the other on the display.

–	Press the ← key.

–	Press button “05 - Erase fault memory” on display.

–	Press function “06-End output”.

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