Engine Control Module with Anti-Theft Immobilizer

Engine Control Module with Anti-Theft Immobilizer

• If it is desired to replace the Engine Control Module (ECM), connect the vehicle diagnostic tester and perform the guided function "Replace Engine Control Module (ECM)".

Special tools, testers and auxiliary items required

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

• Small Nozzle Attachment from Wiring Harness Repair Kit (VAS 1978)

Removing

- Turn off the ignition.

- Remove the windshield wiper arms.

- Remove the plenum chamber cover.

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

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

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

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





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

- Turn on the heat gun and heat the bolt heads - arrows - for approximately 20 to 25 seconds.





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

- Remove the cover - 1 - downward from the control module.





- Slide the connector latches - 1 - on the ECM outward and remove both connectors.





- Remove the ECM.

Installing

- Install the ECM in the frame in the plenum chamber.

- Connect the connector to the ECM and slide the latches - 1 - inward.





- Place the cover - 1 - over the ECM and install new shear bolts - arrows - by hand.





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

- Install the plenum chamber cover.

- Install the windshield wiper arms.