SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-Cyl. Injection Engine (2 valves, roller rocket finger), Mechanics | Mixture preparation system, electronic inj.,Gas | Engine control unit

Replacing engine control unit

Special tools and workshop equipment required

t	Fault reader -V.A.G 1551- with cable -V.A.G 1551/3A-

Removing

–	First print out the control unit identification and thereby the previous control unit coding as follows:

–	Connect the fault reader -V.A.G 1551- (-V.A.G 1552-). Then switch ignition on and select engine control unit with the “Address word” 01. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)

The control unit identification and the coding will appear on the display, e.g.:

–	Print out the control unit identification by pressing the fault reader print button.

–	Press the → key.

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

–	Switch off ignition.

–	Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92

–	Release connector from control unit and pull off.

030906032E       ME 7.5.10        2853 →

Coding XXXXX                   WSC XXXXX

–	Unclip the control unit from the retaining frame -arrows-.

Installing

–	Place the new control unit into the retaining frame.

–	Install control unit connector and lock.

–	Adapt new control unit to throttle valve control part → Chapter

–	Perform adaption of exhaust gas recirculation potentiometer.

Conditions

l	The battery voltage must be at least 11.5 V.

Indicated on display:

–	Press keys 0 and 4 for the function “Introduction of basic setting” and confirm entry with Q key.

Rapid data transfer                 HELP

Select function XX

Indicated on display:

–	Press keys 0, 7 and 4 for the “Display group number 74” and confirm entry with Q key.

Basic setting

Input display group number XXX

Indicated on display: (1...4 = display zones)

–	Observe displayed value in display zone 4. (4th digit from left) Specification: ADP. OK

–	Conclude adaption by pressing → key.

–	Adapt new control unit to the electronic immobilizer → Chapter → Vehicle diagnosis, testing and information system VAS 5051

–	Then subsequently interrogate the fault memory of the new engine control unit and erase the fault memory if necessary → Vehicle diagnosis, testing and information system VAS 5051, interrogating and erasing fault memory.

–	Perform idling check → Chapter

Basic setting 74                       →

     xxx %     xxx %     x     ADP. runs

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