Engine Control Module, with Anti-Theft Immobilizer

Engine Control Module, with Anti-Theft Immobilizer

Special tools, testers and auxiliary items required

• Window cutter (VAG 1561A) with saw set (VAG 1561/14)

• Hot air gun from the wiring harness repair kit (VAS 1978)

• Vehicle diagnosis, testing and information system (VAS 5051B)

• Locking pliers

• Protective gloves

• If the Engine Control Module (ECM) is to be replaced, connect the (VAS 5051B) and perform the "Guided Function, Replacing Engine Control Module".

Removing

- Turn off the ignition.

- Remove the wiper arms and plenum chamber cover.

- Remove the plenum chamber bulkhead.

• The threads of the shear bolts are equipped with locking compound. By heating the shear bolts using the hot air gun, the inhibition effect of the locking compound is lowered.

CAUTION!
Cover the wires, harness connectors and the control modules in close vicinity of the ECM to prevent damage from burning.

Set the hot air gun - 4 - as shown:





- Turn potentiometer for the temperature adjustment - 2 - to maximum heat output (600 °C).

- Move the two stage switch for air quantity - 3 - to position 3.

CAUTION!
By heating the shear bolts, parts of the protective housing are heated intensely. Wear protective gloves to prevent injuries.

- Guide nozzle of the hot air gun onto the shear bolts.

- Switch on the hot air gun and heat the shear bolt for approximately 20 to 25 seconds.

- Remove the shear bolts using pliers on the bolt head.

The procedure for the second shear bolt is exactly the same.

If the bolts cannot be removed:

- Cut into the heads of the shear bolts so that two parallel surfaces are formed - arrows - and remove the bolts.





- Insert a screwdriver - A - between the protective housing and retaining plate - arrow -.





- Pry the protective housing upward using the screwdriver - A - and pull it off sideways from retaining plate - arrow -.





- Disengage the front harness connector - 1 - from the ECM and disconnect it.





- Pry up locking mechanism - 2 - slightly.

- Push the ECM in - direction of arrow - out of the retaining plate.

- Release the rear connector from the ECM and remove it.

Installing

- Connect the rear connector to the ECM and lock it into place.

- Slide the ECM on to retaining plate.

- Connect the front harness connector to ECM and engage it.

- Slide the protective housing onto the retaining plate.

- Tighten the shear bolts - 1 - uniformly until the bolt heads shear off.





- Install the plenum chamber bulkhead.

- Install the wiper arms and plenum chamber cover.

- If the ECM was replaced, connect the (VAS 5051B) and perform the "Guided Function, Replacing Engine Control Module ".

- Check the ECM Diagnostic Trouble Code (DTC) memory erase all DTC entries. Refer to "Guided Function".

• If the DTC memory was erased, generate a readiness code.

- Perform a test drive.

• Observe the safety precautions that apply to road tests. Refer to --> [ If special testing equipment is required during road test, note the following: ] Safety Precautions.

- Again, check the ECM DTC memory.