DTC 27-1

DTC 27-1: Hypoid Gear Speed Sensor (Open or Short)

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

1. Turn the ignition switch 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. Turn the ignition switch OFF.
5. Raise the vehicle, make sure it is securely supported, and allow all four wheels to rotate freely.
6. Start the engine.
7. Shift to D position, and raise the vehicle speed to 19 mph (30 km/h).
8. Check for DTCs with the HDS.

Is DTC 27-1 indicated?

YES - Go to step 9.

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

9. 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 10.

10. Raise the vehicle speed to 19 mph (30 km/h) again.
11. Check a 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 and recheck.

NO - Go to step 12.

12. Raise the vehicle speed to 19 mph (30 km/h) again.
13. Measure the voltage between SH-AWD control unit connector terminals A5 and A13.





Does the voltage change when the propeller shaft is rotated?

YES - Substitute a known-good SH-AWD control unit and recheck.

NO - Go to step 14.

14. Turn the ignition switch OFF.
15. Disconnect the hypoid gear speed sensor 3P connector.
16. Turn the ignition switch ON (II).
17. 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 23.

NO - Go to step 18.

18. Turn the ignition switch OFF.
19. Disconnect SH-AWD control unit connector A (26P).
20. Check for continuity between SH-AWD control unit connector terminal A18 and hypoid gear speed sensor 3P connector terminal No. 1.





Is there continuity?

YES - Go to step 21.

NO - Repair open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor connector.

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





Is there continuity?

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

NO - Go to step 22.

22. Check for continuity between SH-AWD control unit connector terminal A5 and hypoid gear speed sensor 3P connector terminal No. 3.





Is there continuity?

YES - Substitute a known-good SH-AWD control unit and recheck.

NO - Repair open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor connector.

23. Check for continuity between SH-AWD control unit connector terminal A2 and hypoid gear speed sensor 3P connector terminal No. 2.





Is there continuity?

YES - Go to step 24.

NO - Repair open in the wire between SH-AWD control unit connector A and the hypoid gear speed sensor connector.

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





Is there continuity?

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

NO -Replace the hypoid gear speed sensor.