Transmission Vehicle Speed Sensor (VSS) G38 , checking

Special tools, testers and auxiliary items required 

• Multimeter
• Wiring diagram

Requirements 

• The Transmission Control Module (TCM) J217 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.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → Motronic Engine Control Module (ECM) J220 , replacing 

Start diagnosis 

• Disconnect the Transmission Vehicle Speed Sensor (VSS) G38 electrical harness connector.
• Check the electrical harness connector for damage, corrosion, lose 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 Test Box 105 Pin VAG1598/31. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .

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 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.

Transmission Vehicle Speed Sensor (VSS) G38 electrical harness connector terminal	Transmission Control Module (TCM) J217 electrical harness connector T68 terminals or test box sockets
1	66
2	21

Specified value: 1.5 Ω Max.

If the specified value 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. Refer to 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS for 4 SPD. AUTOMATIC TRANSMISSION 01M or 38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS for 5 SPD. AUTOMATIC TRANSMISSION 09A.
• 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 Transmission Control Module (TCM) J217. Refer to 37 AUTOMATIC TRANSMISSION - CONTROLS, HOUSING .
• Assembly is performed in the reverse of the removal.

Final procedures 

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217..
3. If the DTC memory was erased, generate readiness code.

End diagnosis