Engine Control Module, Replacing
Engine Control Module, Replacing
Special tools, testers and auxiliary items required
• Heat gun.
• flat blade screwdriver
• locking pliers
• To achieve optimal anti-theft protection for the vehicle, an anti-theft immobilizer was installed. The anti-theft immobilizer is a system for enabling/locking the Engine Control Module (ECM) J623. So that this system cannot be circumvented, it is necessary to perform adaptation of the anti-theft immobilizer using the Vehicle Diagnosis & Service Syst. -VAS5052- in the On Board Diagnostic (OBD) function. The great availability of equipment options makes adaptation of the Engine Control Module (ECM) -J623- necessary (e.g. cruise control system). This "writing" function is not possible with the generic scan tool, therefore it is necessary to use the Vehicle Diagnosis & Service Syst. -VAS5052- in On Board Diagnostic (OBD) function for this purpose. If the Engine Control Module (ECM) -J623- must be replaced, the vehicle may be taken to the nearest Audi dealership for ECM and immobilizer activation instructions.or instructions on obtaining a Vehicle Diagnosis & Service Syst. -VAS5052-. When the electrical connector is disconnected from the Engine Control Module (ECM) --J623--, adaptation values are erased and content of the DTC memory remains intact. 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.
• The Engine Control Module (ECM) (J623) - 1 - is bolted to a protective housing - 5 -. To make removing the shear bolts - 4 - for the retaining tabs - 2 - more difficult, the threads are coated with locking compound.
• To disconnect the electrical connectors from the Engine Control Module (ECM) (J623) (e.g. to connect the test box or to replace the ECM), the protective housing must be removed.
Removal
- Remove the rubber seal - 1 - from the plenum chamber cover.
- Remove the plenum chamber cover - 2 -.
- Using a screwdriver, remove the wiper arms caps - arrows -
- Loosen the wiper arm nuts - arrows - several turns. Loosen wiper arms by gently rocking. Remove wiper arm nuts and wiper arms.
- Remove the screws - arrows - retaining the cowl grill - 1 -.
- Remove the cowl grill from the windshield.
- Remove the screws - arrows - and the electronics box cover from the electronics box.
- Using a screwdriver - arrows 1 - and - 2 -, carefully remove the retaining clip - 2 -. Caution: To prevent damage (burning) of wire and harness connections, insulation and control modules, perform the following work procedures exactly! Observe operating instructions for heat gun.
• The threads of both shear bolts - 3 -, that are screwed into the 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 the ECM).
After heating, parts are extremely hot. To prevent personal injury, avoid touching the protective housing after heating the shear bolts and surrounding area.
The shear bolts that are screwed into the Engine Control Module (ECM) (J623), are not coated with a locking compound and do not require heating. Do not heat the Engine Control Module (ECM) (J623) or damage to the Engine Control Module (ECM) (J623) may occur.
To avoid damage (burning) of wire connections and harness connectors, insulation and control modules, the following work steps must be adhered to exactly! Observe operating instructions for heat gun.
- Removing shear bolts
- Using the heat gun, heat the shear bolts as follows: Direct the heat gun nozzle at the shear bolts of the protective housing.
- Remove shear bolts with locking pliers - arrow -.
Remove the electrical harness connector retaining brackets and the electrical harness connectors from the Engine Control Module (ECM) -J623
Installing
Installation is in the reverse order of removal. Note the following:
- The ECM must be installed with the protective housing.
- Use new shear bolts.
- Remove a thread compound from the threaded holes with a thread cutter (tap) to allow for new shear bolt installation.
After installing a new Engine Control Module (J623), the following work steps must be performed:
- Activate the Engine Control Module (J623).