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. Make sure the HDS communicates with the vehicle and the SH-AWD control unit. If it doesn't, troubleshoot the DLC circuit. Testing and Inspection
3. Clear the DTC with the HDS.
4. Start the engine.
5. Test-drive under these conditions:
- Vehicle speed at 40 km/h (25 mph) or more
- Engine speed less than 2,500 rpm for at least 30 seconds.
6. Check for DTCs with the HDS.
Is DTC 76-1 indicated?
YES - Go to step 7.
NO - Intermittent failure, the system is OK at this time.
7. Check for DTC 27-1 and DTC 27-2 with the HDS.
Are DTC 27-1 and DTC 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 8.
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. Check for rear brake drag.
Do the rear brakes drag?
YES - Fix the rear brakes. Locations
NO - Go to step 10.
10. Raise the vehicle.
11. 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 30 km/h (19 mph), then slow down and stop the wheels.
12. Check the hypoid gear speed sensor value 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 13.
13. 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 30 km/h (19 mph), then slow down and stop the wheels.
14. 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 15.
15. Turn the ignition switch to LOCK (0).
16. Disconnect the hypoid gear speed sensor 3P connector.
17. Turn the ignition switch to ON (II).
18. Measure the voltage between the hypoid gear speed sensor 3P connector terminals No. 1 and No. 3.
Is there 4.0 V or more?
YES - Go to step 19.
NO - Go to step 23.
19. Turn the ignition switch to LOCK (0).
20. Disconnect SH-AWD control unit connector A (26P).
21. Connect the hypoid gear speed sensor 3P connector terminal No. 2 to body ground with a jumper wire.
22. 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 open in the wire between SH-AWD control unit and the hypoid gear speed sensor.
23. Turn the ignition switch to LOCK (0).
24. Disconnect SH-AWD control unit connector A (26P).
25. Connect the hypoid gear speed sensor 3P connector terminal No. 1 to body ground with a jumper wire.
26. Check for continuity between SH-AWD control unit connector terminal A18 and body ground.
Is there continuity?
YES - Go to step 27.
NO - Repair open in the wire between SH-AWD control unit and the hypoid gear speed sensor.
27. Remove the jumper wire from hypoid gear speed sensor 3P connector terminal No. 1.
28. Connect the hypoid gear speed sensor 3P connector terminal No. 3 to body ground with a jumper wire.
29. 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 open in the wire between SH-AWD control unit and the hypoid gear speed sensor.
