ECM, Removing and Installing

ECM, Removing and Installing

Special tools, testers and auxiliary items required

• Heat gun.

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

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.

Start diagnosis

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

- Connect the scan tool.

- Switch the ignition on.

- Using the scan tool, select "Mode 09: Vehicle information ".

- Select " Calibration Identification".

The Engine Control Module (ECM) (J623) identification number will be displayed, e.g.: 06A906032NA 4983

- Record the Engine Control Module (ECM) (J623) identification number.

- End diagnosis and switch the ignition off.

Removing

- Remove the rubber seal - arrow - from the plenum chamber cover- 1 -.

- Remove the plenum chamber cover - 1 -.





- Using a screwdriver, remove the wiper arms caps - 3 -.





- Loosen the wiper arm nuts - 4 - several turns.

- Loosen the wiper arms- 2 - by gently rocking.

- Remove the wiper arm nuts and wiper arms - 2 -.

- Disconnect the retaining clips - 1 - and remove the cowl panel grille - 5 -.

- Remove the screws - arrows - and electronics box cover from the electronics box.





- Using a screwdriver, carefully pry off mounting bracket - arrow - and remove the Engine Control Module (ECM) (J623) from the electronics box.





• The Engine Control Module (ECM) (J623) remains connected at the wiring harnesses.

CAUTION!
To prevent damage (burning) to wire and harness connections, insulation and control modules, perform the following work steps exactly! Observe operating instructions for heat gun.

• The threads in the protective housing, into which the shear bolts are threaded, are then heated with the heat gun. During this step, the holding effect that the locking compound has on the shear bolt threads is reduced, thereby allowing the shear bolts to be removed easier.

- Using a Heat gun set at its lowest setting, heat the shear bolt for approx. 20 to 25 seconds.





- Remove the shear bolt with locking pliers. Discard the used shear bolts.

Repeat the previous steps for the second shear bolt.





- Remove the electrical harness connector retaining brackets - 2 - and - 5 - and the electrical harness connectors from the Engine Control Module (ECM) (J623).





- Remove the Engine Control Module (ECM) (J623).

Installing

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

• New shear bolts must be used when reinstalling the electrical harness connector retaining brackets to the Engine Control Module (ECM) (J623).

• After installing a new Engine Control Module (ECM) ( J623) it must be adapted. ADD LINK

Final procedures

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

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

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

3. If the DTC memory was erased, generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.