27-1

SH AWD DTC Troubleshooting: 27-1

DTC 27-1:

Hypoid Gear Speed Sensor (Open or Short)

NOTE: Before you troubleshoot, review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Turn the ignition switch to LOCK (0).

4. Raise the vehicle on a lift, make sure it is securely supported, and allow all four wheels to rotate freely.

5. Start the engine.

6. Turn the VSA off (the VSA OFF indicator in the gauge control module turns on). Run the engine until the vehicle speed reaches 19 mph (30 km/h) and maintain the speed for 1 minute, then slow down and stop the wheels.

7. Check for DTCs with the HDS.

Is DTC 27-1 indicated?

YES -

Go to step 8.

NO -

Intermittent failure, the system is OK at this time.�

8. Check for DTCs in the VSA system with the HDS.

Are any VSA System DTCs indicated?

YES -

Go to the indicated DTC's troubleshooting.�

NO -

Go to step 9.

9. Run the engine until the vehicle speed reaches 19 mph (30 km/h) and maintain the speed.

10. Check the HYPOID GEAR SPEED SENSOR VALUE in the DATA LIST with the HDS.

Is a hypoid gear speed sensor value shown?

YES -

Check the hypoid gear speed sensor installation. If it is installed properly, substitute a known-good SH-AWD control unit Service and Repair and recheck. If the symptom/indication goes away with the known-good SH-AWD control unit, replace the original SH-AWD control unit Service and Repair.�

NO -

Go to step 11.

11. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II).

12. Measure the voltage between SH-AWD control unit connector terminals A2 and A13, then rotate the propeller shaft.





Does the voltage change?

YES -

Substitute a known-good SH-AWD control unit Service and Repair and recheck. If the symptom/indication goes away with the known-good SH-AWD control unit, replace the original SH-AWD control unit Service and Repair.�

NO -

Go to step 13.

13. Turn the ignition switch to LOCK (0).

14. Disconnect the hypoid gear speed sensor 3P connector.

15. Turn the ignition switch to ON (II).

16. Measure the voltage between hypoid gear speed sensor 3P connector terminals No. 1 and No. 3.





Is there 4.0 V or more?

YES -

Go to step 25.

NO -

Go to step 17.

17. Turn the ignition switch to LOCK (0).

18. Disconnect SH-AWD control unit connector A (26P).

19. Connect hypoid gear speed sensor 3P connector terminal No. 1 to body ground with a jumper wire.






20. Check for continuity between SH-AWD control unit connector terminal A18 and body ground.





Is there continuity?

YES -

Go to step 21.

NO -

Repair an open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor 3P connector.�

21. Remove the jumper wire from hypoid gear speed sensor 3P connector terminal No. 1.

22. Check for continuity between SH-AWD control unit connector terminal A18 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor 3P connector.�

NO -

Go to step 23.

23. Connect hypoid gear speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.






24. Check for continuity between SH-AWD control unit connector terminal A5 and body ground.





Is there continuity?

YES -

Substitute a known-good SH-AWD control unit Service and Repair and recheck. If the symptom/indication goes away with the known-good SH-AWD control unit, replace the original SH-AWD control unit Service and Repair.�

NO -

Repair an open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor 3P connector.�

25. Turn the ignition switch to LOCK (0).

26. Disconnect SH-AWD control unit connector A (26P).

27. Connect hypoid gear speed sensor 3P connector terminal No. 2 to body ground with a jumper wire.






28. Check for continuity between SH-AWD control unit connector terminal A2 and body ground.





Is there continuity?

YES -

Go to step 29.

NO -

Repair an open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor 3P connector.�

29. Remove the jumper wire from hypoid gear speed sensor 3P connector terminal No. 2.

30. Check for continuity between SH-AWD control unit connector terminal A2 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor 3P connector.�

NO -

Replace the hypoid gear speed sensor Service and Repair.�