Automatic Transmission

Multi-Function Transmission Range Switch, Checking

• The Multi-Function Transmission Range (TR) Switch ( F125) is a component of the Mechatronic unit and cannot be replaced separately.

Requirements

• Control Module with indicator unit in the Instrument Cluster Control Module (J285) must be OK.

• The battery voltage must be at least 12.5 Volts.

• All electrical consumers must be switched off.

• The parking brake must be engaged.

• The elector lever must be in the "P" position.

• The Ground (GND) connections to transmission must be OK.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.

Start diagnosis

- Switch the ignition on.

- Depress the brake pedal and maintain depressed.

- Shift the selector lever into all positions.

The selector lever position must correspond to the display of the Control Module with the indicator unit in the Instrument Cluster Control Module (J285).

- Switch the ignition off.

If the selector lever position does not correspond to the display of the Control Module with indicator unit in the Instrument Cluster Control Module (J285):

- Disconnect the Transmission Control Module (TCM) (J217) electrical harness connector - direction of the arrow -.





- Observe safety precautions.

- Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK:

- Repair the malfunction and repeat the test sequence.

If the electrical harness connector is OK:

- Check the wiring according to the wiring diagram:

If no malfunctions are found in the wiring:

- Replace the Mechatronic unit in the transmission.

• The Transmission Control Module (TCM) (J217) is a component of the Mechatronic unit and cannot be replaced separately.

Final procedures

1. Check the DTC memory. => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase DTC memory of the Transmission Control Module (TCM) (J217). => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. Generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.