DTC C1860-98 (76-01): Differential Fluid Overheated

NOTE: 

• Before you troubleshoot, Refer to: HOW TO TROUBLESHOOT THE REAL TIME AWD SYSTEM (AWD) .
• 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 except DTC C1860-98 and/or DTC C1861-9A is stored at the same time as DTC C1860-98 and/or DTC C1861-9A, troubleshoot except DTC C1860-98 and/or DTC C1861-9A first, then recheck for DTC C1860-98 and/or DTC C1861-9A.

DTC (Real Time AWD)

1. 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

   - 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 

   Replace the tire with the standard size.

3. Rear brake drag check

   - 1. Check for rear brake drag.

   Are the rear brakes OK?

   YES 

   The rear brakes are OK. Go to step 4.

   NO 

   Inspect and repair the rear brakes.

4. Brake system indicator (red) check

   - 1. Apply the parking brake.

   Does the brake system indicator (red) come on?

   YES 

   The brake system indicator (red) is OK. Go to step 5.

   NO 

   BRAKE SYSTEM SYMPTOM TROUBLESHOOTING - RAPID BRAKE PAD WEAR, VEHICLE VIBRATION (AFTER A LONG DRIVE), OR HIGH, HARD BRAKE PEDAL .

5. 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. Check the temperature of the rear differential fluid then compare it with the value checked in step 5-1.

   Is the difference within ±54 °F (±30 °C)?

   YES 

   The rear differential fluid temperature sensor is OK. Go to step 6.

   NO 

   REAR DIFFERENTIAL FLUID TEMPERATURE SENSOR REMOVAL & INSTALLATION(AWD) .

6. 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 

   REAR DIFFERENTIAL FLUID PRESSURE SENSOR TEST (AWD) .