Engine Control Module J623, Replacing

Engine Control Module J623, Replacing

Removing

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.

Work procedure

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 "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

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

• The threads of the shear bolts have been coated with a locking compound and must be heated to be removed.

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

CAUTION!
The heat gun, shear bolts, and parts of the protective housing will become extremely hot. Use extreme caution when working with or handling these parts to avoid personal injury.

- 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.

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





- Pry the protective housing upward using screwdriver - A - and pull it off sideways from retaining plate - arrow -.





- Disconnect the forward electrical harness connector - 1 - from Engine Control Module (ECM).

- Pry up locking mechanism - 2 - slightly.

- Slide the Engine Control Module (ECM) out of retainer - arrow -.





- Disconnect the rear harness connector from Engine Control Module (ECM).

Engine Control Module (ECM) (J623) installation

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

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

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

Engine Control Module (ECM) (J623) reprogramming

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

Final procedures

After 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.

End of procedure