Engine Control Module (J623), with a Anti-Theft Immobilizer

with a 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)

• If it is desired to replace Engine Control Module (ECM), connect the vehicle diagnosis, testing and information system (VAS 5051B) and perform the guided function "Replace Engine Control Module (ECM)".

Removing

- Turn off the ignition.

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

• The threads 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 wires, harness connectors and control modules in close vicinity of the ECM to prevent damage from burning.

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

- Turn the 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.


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 of the bolts so that 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 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 plenum chamber bulkhead, the plenum chamber cover and the windshield wiper arms.