Transmission Position Sensor/Switch: Testing and Inspection

Multi-Function Transmission Range (TR) Switch F125, Checking

Special tools, testers and auxiliary items required
- Multimeter
- Wiring diagram

Requirements
- Fuse SB28 OK.
- The Control Module with indicator unit in the Instrument Cluster Control Module J285 must be 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.

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 - 2 -.
- 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 not OK:
- Repair the malfunction.

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 Fuse (on fuse/relay panel) S7 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.







- 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.

Multi-Function Transmission Transmission Control Module (TCM)
Range (TR) Switch F125 J217 electrical connector T52
electrical harness connector terminals or test box sockets
terminals
1 47
3 1 and 2
4 1 and 2
5 22
7 10
8 21
9 36

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 resistance was not OK:
- Replace the Multi-Function Transmission Range (TR) Switch F125.
- Erase the 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. Monitors, Trips, Drive Cycles and Readiness Codes
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and resistance was OK:
- Replace the Transmission Control Module (TCM) J217.
- Assembly is performed in the reverse of the removal.

Final procedures
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217.
3. Generate readiness code.

End diagnosis.