Skoda Workshop Service and Repair Manuals > Octavia Mk2 > Drive unit | 1.9/77 kW TDI PD Engine | Fuel preparation system Diesel injection | Engine control unit | Removing and installing engine control unit (Octavia II)

Removing and installing engine control unit (Octavia II)

Note

In order to unplug the plugs from the control unit, the control unit must always be removed.

Special tools and workshop equipment required

t	Body saw e.g. -V.A.G 1523/A-

Note

If the engine control unit must be replaced, connect → Vehicle diagnosis, testing and information system VAS 5051 and perform the function “replace engine control unit”.

Removing

–	When replacing the engine control unit, in the “guided fault finding” the diagnostic field “replace engine control unit” must be selected → Vehicle diagnosis, testing and information system VAS 5051.

–	Switch off ignition.

–	Remove the cooling water tank cover → Body Work → Rep. Gr.66.

–	Remove bulkhead plenum chamber -arrows-.

–	Remove windscreen wiper and washer system → Electrical System → Rep. Gr.92.

For vehicles with protective cover

–	Cut with body saw -1- a slot for the cross-head screwdriver in the heads of the pull-off screws -2-.

–	Screw out the screws.

–	Lift locking tab of protective cover with a cross-head screwdriver.

–	Push the protective cover in the -direction of the arrow- out of the bracket for engine control unit.

For all vehicles

–	Unlock retaining bracket -2-.

–	Push out engine control unit with plugs in -direction of arrow-.

Disconnect plug at engine control unit and unplug.

Install

Note

For vehicles with protective cover, the metal swarfs must be suctioned out of the plenum chamber before installing the engine control unit.

–	Connect both plugs and lock.

–	Push engine control unit into the bracket and lock with retaining bracket -2-.

For vehicles with protective cover

–	Fasten protective cover with new pull-off screws (before tightening align the protective cover in such a way that it does not come into contact with the surrounding components)

For all vehicles

–	Install windscreen wiper and washer system → Electrical System → Rep. Gr.92.

–	Install bulkhead plenum chamber and plenum chamber cover → Body Work → Rep. Gr.66.

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