Engine Control Module: Service and Repair

Engine Control Module, through 11.08

=> [ Without Anti-Theft Immobilizer ]

=> [ With Anti-Theft Immobilizer ]

Without Anti-Theft Immobilizer

• If the Engine Control Module (ECM) will be replaced, connect the vehicle diagnostic tester and perform the "Replacing Engine Control Module" guided function.

Removing

- Turn off the ignition.

- Remove the windshield wiper arms, plenum chamber cover and bulkhead plenum chamber.

- Disconnect the front connector - 1 - from the ECM.





- Pry up the locking mechanism - 2 - slightly.

- Then, slide the ECM out of the retainer - arrow -.

- Disconnect the rear connector from the ECM.

Installing

- Connect and lock the rear connector to the ECM.

- Slide the ECM onto the retaining plate.

- Connect and lock the front connector to the ECM.

- Install the bulkhead plenum chamber, the plenum chamber cover and the wiper arms. Refer to

With Anti-Theft Immobilizer

Special tools, testers and auxiliary items required

• Electric Knife (V.A.G 1561 A)

• Saw Set (V.A.G 1561/14)

• Locking Pliers

• Hot Air Gun from Wiring Harness Repair Kit (VAS 1978 B)

• If the Engine Control Module (ECM) will be replaced, connect the vehicle diagnostic tester and perform the "Replacing Engine Control Module" guided function.

Removing

- Turn off the ignition.

- Remove the windshield wiper arms, plenum chamber cover and bulkhead plenum chamber.

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


Cover the wires, connectors and control modules near the ECM to prevent them from being burned.

Perform the adjustments on the hot air gun - 4 - as shown:

- Turn the potentiometer for the temperature adjustment - 2 - to the maximum heat output (600 degrees C (1112 degrees F)).





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


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

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

- Turn the heat gun on and heat the bolts.

- Remove the bolts using locking pliers.

• If the bolts cannot be removed, cut into the heads so two parallel surfaces are formed - arrows - and then remove them.





- 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 the retaining plate - arrow -.





- Disconnect the front connector - 1 - from the ECM.





- Pry up the locking mechanism - 2 - slightly.

- Then slide the ECM out of the retainer - arrow -.

- Disconnect the rear connector from the ECM.

Installing

- Connect and lock the rear connector to the ECM.

- Slide the ECM onto the retaining plate.

- Connect and lock the front connector to the ECM.

- Slide the protective housing onto the retaining plate.

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





- Install the bulkhead plenum chamber, the plenum chamber cover and the wiper arms. Refer to