DTC 42-2

DTC 42-2: Differential Fluid Temperature Sensor (Open/GND Short)

NOTE: Before you troubleshoot, review the general troubleshooting information.

1. Turn the ignition switch to ON (II).
2. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit.
3. Clear the DTC with the HDS.
4. Raise the vehicle, make sure it is securely supported, and allow all four wheels to rotate freely.
5. Start the engine and turn the VSA off (the light on the VSA OFF switch comes on). Run the engine in the D position until the vehicle speed reaches 35 mph (56 km/h) and keep running for 10 minutes, then slow down and stop the wheels.
6. Check for DTCs with the HDS.

Is DTC 42-2 indicated?

YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time.

7. Turn the ignition switch to LOCK (0).
8. Disconnect SH-AWD control unit connector A (20P).
9. Connect SH-AWD control unit connector terminal A18 to body ground with a jumper wire.





10. Disconnect the rear differential fluid temperature sensor 2P connector.
11. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 1 to body ground.





Is there continuity?

YES - Go to step 12.

NO - Repair open in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.

12. Connect SH-AWD control unit connector terminal A8 to body ground with a jumper wire.





13. Check for continuity between rear differential fluid temperature sensor 2P connector terminal No. 2 to body ground.





Is there continuity?

YES - Go to step 14.

NO - Repair open in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.

14. Check for continuity between SH-AWD control unit connector terminals A9 and A18.





Is there continuity?

YES - Repair short in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.

NO - Go to step 15.

15. Check for continuity between SH-AWD control unit connector terminals A8 and A9.





Is there continuity?

YES - Repair short in the wire between SH-AWD control unit connector A and the rear differential fluid temperature sensor connector.

NO - Go to step 16.

16. Reconnect all connectors.
17. Measure resistance between SH-AWD control unit connector terminals A8 and A18.





Is there 12.67 k Ohms or less?

YES - Update the SH-AWD control unit if it does not have the latest software, or substitute a known-good SH-AWD control unit and recheck. If the symptom/indication goes away with the updated SH-AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good SH-AWD control unit, replace the original SH-AWD control unit.

NO - Replace the rear differential fluid temperature sensor.