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

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Special tools, testers and auxiliary items required

Multimeter
Wiring diagram

Requirements

Fuse 31 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. Refer to → Motronic Engine Control Module (ECM) J220 , replacing

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 :

Fig 1: Identifying Multi-Function Transmission Range Switch F125 Electrical Harness Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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 7 to Ground (GND) for voltage.

Specified value, Battery voltage.

Switch the ignition off.

If the specified value was not obtained:

Check the wiring from the Multi-Function Transmission Range (TR) Switch F125 electrical harness connector terminal 7 to the Transmission Control Module (TCM) J217 electrical harness connector T68 terminal 23 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 - 68 Pin VAG1598/18. Refer to 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS .

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 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS 8.

Fig 2: 10-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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 T68 terminals for an open circuit.

Multi-Function Transmission Range (TR) Switch F125 electrical harness connector terminals	Transmission Control Module (TCM) J217 electrical harness connector T68 terminals or test box sockets
1	63
2	40
3	1
4	empty
5	18
6	62
7	23

Specified value: 1.5 Ω 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. For all Automatic Transmission system removal/installation procedures and torque specifications. Refer to 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS

If no malfunction is found in the wiring and the resistance was OK:

Replace the Transmission Control Module (TCM) J217. For all Automatic Transmission system removal/installation procedures and torque specifications. Refer to 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS .
Erase the DTC memory. Refer to → Diagnostic Mode 04: Reset/delete diagnostic data
Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to → Readiness Code .

End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .
Assembly is performed in the reverse of the removal.

Final procedures

Check the DTC memory. Refer to.
If necessary, erase DTC memory of the Transmission Control Module (TCM) J217.
Generate readiness code.

End diagnosis.