SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | Manual 4-cyl. injection engine (4 valves), mechanics | Mixture preparation system, electronic inj.,Gas | Engine control unit | Control unit voltage supply: checking

Test sequence

–	Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and use address code 01 to select engine control unit. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)

Indicated on display:

–	Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.

Rapid data transfer                 HELP

Select function XX

Indicated on display:

–	Press keys 0, 0 and 2 for “Display group number 2” and confirm entry with Q key.

Read measured value block

Input display group number XXX

Indicated on display: (1...4 = Display fields)

–	Read off figure displayed in display field 3. Specification: min. 11.5 V

–	Press → key.

–	Press keys 0 and 6 for the “End output” function and confirm input with the Q key.

–	Switch off ignition.

If the specification is not obtained:

Read measured value block       2      →

–	Connect test box -V.A.G 1598/22- to control unit wiring harness.

SEAT Workshop Service and Repair Manuals