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 ON (II).
2. Clear the DTC with the HDS.
3. Raise the vehicle, make sure it is securely supported, and allow all four wheels to rotate freely.
4. 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.
5. Check for DTCs with the HDS.

Is DTC 42-2 indicated?

YES - Go to step 6.

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

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





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





Is there continuity?

YES - Go to step 11.

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

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





12. Check for continuity between rear differential fluid temperature sensor 2P connector No. 1 to body ground.





Is there continuity?

YES - Go to step 13.

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

13. 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 14.

14. 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 15.

15. Reconnect the rear differential fluid temperature sensor 2P connector and SH-AWD control unit connector A (20P).
16. 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.