Transmission Control Module (TCM), Replacing

Transmission control module (TCM), replacing

Points to observe when replacing the control module

Caution: The software can only be ordered when the control module is installed in the car. VADIS reads off the new control module identity. This is required so that the correct software can be ordered.

Caution: Wait two minutes after the ignition has been switched off. The main relay must be voltage free before the control module can be removed from the car. If the engine cooling fan (FC) runs on after the ignition has been switched off, wait until it stops. Then wait a further 2 minutes.

Caution: Always check that the control module and control module box connector pins and sleeves are not bent or damaged. This may have caused the fault.

Preparations for replacement

Removal:





^ the cable from the battery negative terminal.
^ the cover over the control module.

Removing the control module





Note: Do not touch the control module terminal pins with your fingers. Static electricity may damage components in the control module.

Insert tool 999 5722 (1) in the car around the control module. Move the upper section of the tool backwards as far as it will go (2). Raise the tool.

Carefully pull up the control module.

Installing the control module





Carefully press the control module down into the grooves on the inside of the control module box.

Press down all the way.

Insert tool 999 5722 around the control module.

Move the upper section of the tool forwards to stop and pull it up.

Press the cover into place over the control modules.

Check that the air ducts are correctly positioned. Connect the battery negative lead. First read Note when disconnecting/connecting the battery lead.

Ordering software
Order software according to the table.





Programming the control module
Program the new control module according to the table.





Finishing
Check that no diagnostic trouble codes have been stored during the repair.