Volkswagen Workshop Service and Repair Manuals > Polo Mk3 > Power unit | 3-cylinder diesel engine | Self diagnosis, V.A.G Inspection Service | Self-diagnosis | Connecting vehicle diagnosis, testing and information system VAS 5051B and selecting engine electronics control unit

Connecting vehicle diagnosis, testing and information systemVAS 5051B and selecting engine electronics control unit

Connecting vehicle diagnosis, testing and information system -VAS 5051B- and selecting engine electronics control unit

All functions previously carried out with the fault reader -V.A.G 1551- can also be carried out with the vehicle diagnosis, testing and information system -VAS 5051B- in vehicle self-diagnosis mode. → Operating instructions for vehicle diagnosis, testing and information systemVAS 5051B.

Special tools and workshop equipment required

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

Test prerequisites

l	Fuse 11 on fuse holder B -SB11- OK.

l	The battery voltage must be at least 11.5 V.

l	Earth connections on engine and gearbox OK.

Procedure

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

–	Pull out oil dipstick -1-.

–	Push diagnosis lead 5m -VAS 5051B/1- connector onto diagnosis connector.

–	Depending on the desired function, switch on ignition or start engine and run at idling speed. Selectable functions → Chapter.

Note

t	The display fields will be displayed from top to bottom in functions 04 - Basic settings or 08 - Read data block.

t	If the display does not indicate as described in the work sequence: → Operating instructions for vehicle diagnosis, testing and information systemVAS 5051B.

Select operating mode:

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

Select vehicle system:

–	Press “01 - Engine electronics” on display.

The control unit identification and coding -arrow- are indicated on display, e.g.:

If the coding differs from the vehicle version, then:

–	Check control unit coding → Chapter.

Select diagnostic function:

At this point all diagnostic functions are available.

–	Press the desired function on the display.

–	Further measures see repair procedures.

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