Transmission Vehicle Speed Sensor, Checking

Transmission Vehicle Speed Sensor, Checking

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Requirements

• The Transmission Vehicle Speed Sensor (VSS) (G38 ) fuse 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.

• Ignition switched off.

Test procedure

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

Start diagnosis

- Disconnect the Transmission Vehicle Speed Sensor (VSS) (G38) electrical harness connector - arrow -.





- 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 wiring

If the manufacturers test box is being used, perform the following step.

- Install the test box. Refer to => [ 68 Pin Test Box Adapter, Installing ] 68 Pin Test Box Adapter, Installing.

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

- Remove the Transmission Control Module (TCM) ( J217). => [ Transmission Control Module, Replacing ] .

- Using a multimeter, check the Transmission Vehicle Speed Sensor (VSS) (G38) electrical harness connector terminals to the Transmission Control Module (TCM) (J217 ) electrical harness connector T68 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 is found in the wiring and the resistance was not OK:

- Replace the Transmission Vehicle Speed Sensor (VSS) (G38).

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

- Replace the Transmission Control Module (TCM) ( J217).

- 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 OK:

- Replace the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) (J248). Refer to => [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

- Assembly is performed in the reverse of the removal.

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 ] Readiness Code.