76-1
SH AWD DTC Troubleshooting: 76-1
DTC 76-1:
Rear Differential Fluid Overheats
NOTE:
- When the temperature of the rear differential fluid is abnormally high, the SH-AWD indicator comes on. This is not necessarily a problem, but DTC 76-1 will be stored.
- Check the rear differential fluid level Rear Differential Fluid Inspection and Replacement. If it's low, refill it, clear the DTC, and recheck.
- 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. Start the engine.
4. Test-drive under these conditions:
- Vehicle speed at 25 mph (40 km/h) or more
- Engine speed less than 2,500 rpm for at least 30 seconds.
5. Check for DTCs with the HDS.
Is DTC 76-1 indicated?
YES -
Go to step 6.
NO -
Intermittent failure, the system is OK at this time.�
6. Check for DTCs with the HDS.
Are DTC 27-1 and/or 27-2 indicated at the same time?
YES -
Go to the DTC 27-1 and/or 27-2 troubleshooting first, then recheck.�
NO -
Go to step 7.
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. Check for rear brake drag.
Do the rear brakes drag?
YES -
Fix the rear brakes Symptom Related Diagnostic Procedures.�
NO -
Go to step 9.
9. Raise the vehicle on a lift, make sure it is securely supported, and allow all four wheels to rotate freely.
10. Start the engine and turn the VSA off (the VSA OFF indicator in the gauge control module turn 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.
11. Check the HYPOID GEAR SPEED SENSOR VALUE in the DATA LIST with the HDS.
Is the hypoid gear speed sensor value shown?
YES -
Check the hypoid gear speed sensor installation. If it is installed properly, replace the rear differential center case Rear Differential Center Case Replacement.�
NO -
Go to step 12.
12. Turn the ignition switch to LOCK (0), then turn the ignition switch back to ON (II).
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 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 14.
14. Turn the ignition switch to LOCK (0).
15. Disconnect the hypoid gear speed sensor 3P connector.
16. Turn the ignition switch to 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 18.
NO -
Go to step 22.
18. Turn the ignition switch to LOCK (0).
19. Disconnect SH-AWD control unit connector A (26P).
20. Connect hypoid gear speed sensor 3P connector terminal No. 2 to body ground with a jumper wire.
21. Check for continuity between SH-AWD control unit connector terminal A2 and body ground.
Is there continuity?
YES -
Replace the hypoid gear speed sensor Service and Repair.�
NO -
Repair an open in the wire between SH-AWD control unit and the hypoid gear speed sensor.�
22. Turn the ignition switch to LOCK (0).
23. Disconnect SH-AWD control unit connector A (26P).
24. Connect hypoid gear speed sensor 3P connector terminal No. 1 to body ground with a jumper wire.
25. Check for continuity between SH-AWD control unit connector terminal A18 and body ground.
Is there continuity?
YES -
Go to step 26.
NO -
Repair an open in the wire between SH-AWD control unit and the hypoid gear speed sensor.�
26. Remove the jumper wire from hypoid gear speed sensor 3P connector terminal No. 1.
27. Connect hypoid gear speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
28. 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 and the hypoid gear speed sensor.�