Overview Transmission Control

Overview Transmission Control

Overview Transmission Control (Part 1):

Overview Transmission Control (Part 2):

Transmission Control Module (TCM)

Transmission Control Module (TCM):

The TCM is located under the instrument panel on the LH side.

On vehicles with automatic transmissions, the TCM controls the transmission. In this case, a module with 16- and 24-pin connectors is used.

The TCM evaluates the incoming signals from the individual sensors and actuates the solenoid valves in the valve body of the transmission directly according to the operating state.

Diagnostic checks can be carried out on the transmission through the data link connector (DLC) above the central junction box (CJB).

Emergency Operating Program
If correct gear shifting can no longer be guaranteed due to failure of certain signals, the TCM changes to an emergency operating program.

The driver is informed of the operation of the emergency operating program by the illumination of the powertrain warning indicator in the instrument cluster.

Continued motoring is guaranteed in the following limited conditions:

- Maximum main line pressure
- 3rd gear in manual selector lever positions D, 2 and 1 without the torque converter clutch
- REVERSE gear in manual selector lever position R