Generic Scan Tool

Engine Control Module, Replacing

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.

Removing

- Remove the rubber seal in the direction of the - arrow -.

- Remove the plenum chamber cover - 1 -.





- Using a screwdriver, remove wiper arm caps- 3 - from wiper arms.

- Loosen wiper arm nuts - 4 - several turns.

- Loosen wiper arms - 2 - from wiper axle by tilting slightly.

- Remove wiper arm nuts completely and remove wiper arms.

- Remove securing clips - 1 - and cowl - 5 -.





- Remove the screws - arrows - and cover from the E-Box in the plenum chamber.





- Using a screwdriver, remove the retainer bar- arrow - and Engine Control Module (ECM) (J623) from the E-box.





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

CAUTION!
When heating the shear bolts, parts of the protective housing will become extremely hot. Do not burn yourself on this! Make sure that only the shear bolts are heated as much as possible, and not any of the surrounding parts.

• The threads of shear bolts (that are not screwed into ECM) are coated with a locking compound. For this reason, the threads must be heated with the heat gun to remove both bolts.

• The threads of both shear bolts (that are screwed into ECM) are not coated with a locking compound. The threads in the ECM housing must not be heated and do not require to be heated (unintentional heating of ECM).

- Using heat gun, direct the heat gun nozzle at shear bolt of retaining tab for approx. 20 to 25 seconds.





- Using locking pliers, remove shear bolt.





The procedure for second shear bolt is exactly the same.

Remove the protective housing from the Engine Control Module (ECM) (J623).





- Disengage the electrical connector retainers - arrows - and disconnect electrical connectors - 1 and 2 - from Engine Control Module (ECM) (J623).





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

Installing

Installation is in reverse order of removal, the Engine Control Module (ECM) (J623) must be installed with protective housing. New shear bolts must be used.

After installing new Engine Control Module (ECM), the following work steps must be performed:

- 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 mentioned 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 procedure