Replacing Transmission Control Module (TCM)

Replacing the Transmission Control Module (TCM)
Special tools: 999 5722

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





Switch off the ignition Move the gear shift lever to position P.
Remove the cover over the control module.

Note: The Transmission Control Module (TCM) is the module closest to the engine.

Remove the control module





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

Insert tool 999 5722 (1) 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.

Install the control module





Gently press the control module down into the grooves inside the control module box. Press to the limit position!
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 over the control modules.
Check that the air ducts are correctly positioned.

Ordering software
Order software.

Programming the control module
Program the new control module.

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