DTC 27-1

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

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

Is DTC 27-1 indicated?

YES - Go to step 7.

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

7. 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 8.

8. Raise the vehicle speed to 19 mph (30 km/h) again.
9. 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 10.

10. Raise the vehicle speed to 19 mph (30 km/h) again.
11. Measure 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 12.

12. Turn the ignition switch OFF.
13. Disconnect the hypoid gear speed sensor 3P connector.
14. Turn the ignition switch ON (II).
15. Measure 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 21.

NO - Go to step 16.

16. Turn the ignition switch OFF.
17. Disconnect SH-AWD control unit connector A (26P).
18. 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 19.

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

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





Is there continuity?

YES - Repair the 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 20.

20. 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.

21. 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 22.

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

22. 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 connector.

NO - Replace the hypoid gear speed sensor.