Volkswagen Workshop Service and Repair Manuals > Golf Mk4 > Power unit | 4-cylinder injection engine (direct injection) | Mixture preparation system, electronic inj.,Gas | 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 5051B-

t	Diagnosis cable -VAS 5051/1- or -VAS 5051/3-

Procedure

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

–	Connect diagnosis cable -VAS 5051/1- or -VAS 5051/3- to diagnosis connection.

–	Start engine and run at idling speed.

Only when 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 display shows the control unit identification and the coding of the engine control unit.

Select diagnostic function

–	Press button „02 - Read fault memory“ on display.

–	If no fault is stored in engine control unit „0 fault detected“ is displayed.

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

–	Press the ← button.

–	Press button „05 - Clear fault memory“ on display.

–	Press function „06-End output“.

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