Engine Control Module: Service and Repair

Engine Control Module J623

• Perform the "replace engine control module" Guided Function if replacing the Engine Control Module (ECM). Refer to the vehicle diagnostic tester.

Special tools, testers and auxiliary items required

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

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

• Locking Pliers

Removing

- Turn off the ignition.

- Remove the windshield wiper arms.

- Remove the plenum chamber cover.

- Cover the engine compartment in the area near the ECM to prevent scratching the paint.

- Remove the bolts - 1 - and the ECM.






• The shear bolt threads have locking fluid on them. By heating the shear bolts using a hot air gun, the inhibition effect of the locking fluid is lowered.

Make sure other parts cannot get burned.

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

- Heat the shear bolts - arrow - using a hot air gun.






- Loosen the bolts - 1 - using locking pliers.

- Bend the edges of the housing down and remove the bolts.

Installing

- Replace the protective housing.

- Install a new protective housing with new shear bolt.

- Tighten the shear bolts evenly until the bolt head shears off.

- Install the ECM into the plenum chamber.

- Install the plenum chamber cover.

- Install the windshield wiper arms.