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Transmission Position Sensor/Switch: Testing and Inspection






Diagnostic Procedures



Multi-Function Transmission Range Switch, Checking

• The Multi-Function Transmission Range (TR) Switch (F125) is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

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 sequence

- 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. Refer to Repair Manual.

Final procedures

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the Transmission Control Module (TCM) (J217) memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
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