Multi-Function Transmission Range Switch F125, Checking

Multi-Function Transmission Range Switch F125, Checking

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Requirements

• Fuse (SC24) OK.

• The selector lever cable adjustment 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 selector lever must be in the "P" position.

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

• Ignition switched off

Test procedure

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

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 Multi-Function Transmission Range (TR) Switch (F125) electrical harness connector.





- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- Repair any damage found to the electrical harness connector.

If the electrical harness connector is OK:

Checking voltage

- Switch the ignition on.

- Using a multimeter, check the Multi-Function Transmission Range (TR) Switch (F125) electrical harness connector terminal 10 to Ground (GND) for voltage.





- Switch the ignition off.

Specified value, Battery voltage.

If the specified value was not obtained:

- Check the wiring from the Multi-Function Transmission Range (TR) Switch (F125) electrical harness connector terminal 10 to the Transmission Control Module (TCM) (J217) electrical harness connector T52 terminal 27 for an open circuit, short to ground (GND) or a short to Battery (+).

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

- Install the test box. Install the Adapter F/VAG1598 (68 Pin) (VAG1598/22).

If the manufacturers test box is not being used. Perform the following step.

- Remove the Transmission Control Module (TCM) (J217). For all Automatic Transmission system removal/installation procedures and torque specifications. Refer to => [ Transmission Control Module J217, Replacing ] Service and Repair.

- Using a multimeter, check the Multi-Function Transmission Range (TR) Switch (F125) electrical harness connector terminals to the Transmission Control Module (TCM) (J217) electrical harness connector T52 terminals for an open circuit.









Specified value: 1.5 ohms Max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

- If necessary, repair the faulty wiring connection.

If no malfunction was found in the wiring and the voltage was OK:

- Replace the Multi-Function Transmission Range (TR) Switch (F125).

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to => [ Readiness Code ] Readiness Code.

- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:

- Replace the Transmission Control Module (TCM) (J217). Refer to => [ Transmission Control Module J217, Replacing ] Service and Repair.

- Assembly is performed in the reverse of the removal.

Final Procedures

After the repair work, the following work steps must be performed in the following sequence:

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

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Readiness Code.

End of diagnosis.