Engine Control Module, Removing and Installing

Engine Control Module, Removing and Installing

Removing

Special tools, testers and auxiliary items required

• Heat gun.

• When the Motronic Engine Control Module (ECM) (J623 ) electrical harness connectors are disconnected, the adaptation values are erased and the DTC memory content remains intact.

Work procedure

Check the identification of the previous Motronic Engine Control Module (ECM) (J623) as follows:

- Connect the scan tool.

- Switch the ignition on.

- Using the scan tool, select "Vehicle information".

- Select " Calibration Identification" in vehicle information.

The electronic control module identification number will be displayed, e.g.: 06A906032NA 4983

- Record the electronic control module identification number.

- End diagnosis and switch the ignition off.

Procedure

- Switch the ignition on.

- Actuate the touch-wipe function to allow the wipers to move to the service position.





- Remove the wiper arms caps - arrows -.





- Loosen the wiper arm nuts - arrows - several turns.





- Loosen the wiper arms from the wiper axle by rocking slightly.

- Remove the wiper arms nuts and the wiper arms from the wiper axles.

- Remove the spray nozzles - arrow -.

- Press the spray nozzles, with the water lines attached, through the plenum chamber opening.

- Remove the rubber seal - 4 - and the plenum chamber cover - 1 -.





• The threads of the shear bolts have been coated with a locking compound.

- Saw off two rounded sides of the shear bolt heads so that two flat parallel surfaces result - arrows -.





- Using locking pliers, remove the shear bolts. Discard the shear bolts.

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





- Using a screwdriver - A -, pry the protective housing upward and sideways to remove from the retaining plate - arrow -.





- Disconnect the forward electrical harness connector - 1 -.

- Lift up the locking mechanism - 2 - slightly.

- Remove the Motronic Engine Control Module (ECM) ( J623) from the retainer - arrow -.





- Disconnect the rear electrical harness connector.

Installation

Installation is performed in reverse order of removal. Note the following:

The Motronic Engine Control Module (ECM) (J623) must be installed with the protective housing.

Use New shear bolts when installing the Motronic Engine Control Module (ECM) (J623).

Motronic Engine Control Module (ECM) ( J623) reprogramming

- The new Engine Control Module (ECM) (J623) and immobilizer must be activated.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.