SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 3-cylinder diesel engine with pump injector unit, mechanics | Fuel preparation system Diesel injection | Engine control unit | Engine control unit with antitheft protection: Removing and installing, engine code BMS

Engine control unit with antitheft protection: Removing and installing, engine code BMS

To replace the engine control unit, connect the → Vehicle diagnostic, testing and information system VAS 5051 and initiate the guided function „Replacing control unit“.

–	Switch ignition OFF.

Removal:

–	Open the line guide -1- and lift the locking catch -2-.

–	Remove the engine control unit from the bracket.

–	Undo the headless bolts -1- using pliers.

–	Turn the engine control unit -2- und unscrew the second breakaway bolt using pliers.

–	Remove the bracket -1- and the protective casing -2- from the engine control unit -3- in -the direction of the arrow-.

–	Unlock the engine control unit connectors and pull them off.

Installing

–	Fit plug connectors and lock in position.

–	Push protective housing over engine control unit.

–	Fit the protective casing support using new headless bolts

–	Tighten the headless bolts evenly, until the bolt heads break off.

–	Insert the engine control unit in the bracket of the spray wall until you can hear the lock -1- engaging.

–	Press the cable in the cable guide -1- and seal.

–	When replacing the engine control unit, erase the self adapting values and adapt to the engine control unit → Vehicle diagnostic, testing and information system VAS 5051„Guided function“

–	Consult fault memory; if necessary, repair any faults and then erase fault memory → Vehicle diagnostic, testing and information system VAS 5051„guided fault finding“

–	If the fault memory has been erased, you must generate the readiness code again.

–	Take vehicle for a test drive.

–	Again read control unit fault memory.

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