DTC Troubleshooting: C1860-98 (76-01)
DTC C1860-98: Differential Fluid Overheats
NOTE:
Before you troubleshoot, review the General Troubleshooting Information.
When the clutch is presumed to be overheated, DTC C1860-98 is set and the system turns off the clutch engagement to protect the clutch. This DTC may also set under the following conditions.
?
When spinning the rear wheels while the vehicle is stuck in sand, mud, snow, etc
?
When the VSA system is OFF
If other DTCs are stored at the same time as DTC C1860-98 and/or DTC C1861-9A, troubleshoot other DTCs first, then recheck for DTC C1860-98 and/or DTC C1861-9A.

DTC Description
DTC
Freeze Frame
C1860-98 Differential Fluid Overheats
    

1.
DTC check:

DTC check
?1.
Turn the vehicle to the ON mode.

?2.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Is DTC C1860-98, C1861-9A, or other DTC indicated?

     
DTC C1860-98 or C1861-9A is indicated
     
     
     
Go to step 2.
     
Other DTC is indicated
     
     
     
Go to the indicated DTC's troubleshooting.?
2.
Tire size check:

Tire size check
?1.
Check the tire size of the four wheels.

Are all tire sizes same?

     
YES
     
     
     
The tire sizes are OK. Go to step 3.
     
NO
     
     
     
3.
Brake drag check:

Brake drag check
?1.
Check for brake drag.

Are the brakes OK?

     
YES
     
     
     
The brakes are OK. Go to step 4.
     
NO
     
     
     
4.
Rear differential fluid temperature sensor check:

Rear differential fluid temperature sensor check
?1.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Oil temperature for rear differential
    

?2.
Measure the actual temperature of the rear differential fluid, then compare it with the HDS value checked in step 4-1.

Are the values almost the same?

     
YES
     
     
     
The rear differential fluid temperature sensor is OK. Go to step 5.
     
NO
     
     
     
5.
Rear differential fluid pressure sensor test:

Rear differential fluid pressure sensor test
?1.
Do the rear differential fluid pressure sensor test.

Is the test result OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
     
NO