Component Tests and General Diagnostics

Rear Differential Dual Pump System Function Test

Manual Transmission

Starting and accelerating in forward gears (4WD mode)

NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Raise and support the vehicle Service and Repair.

2. Start the engine, and let it idle until the radiator fan comes on at least twice.

3. With the engine at idle, shift into 1st gear, and release the clutch pedal.

4. Firmly apply the parking brake to lock the rear wheels.

- If the engine stalls, the 4WD system is normal.
- If the engine continues running, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit.

Starting and accelerating in reverse gear (4WD mode)

NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Raise and support the vehicle Service and Repair.

2. Start the engine, and let it idle until the radiator fan comes on at least twice.

3. With the engine at idle, shift into reverse gear, and release the clutch pedal.

4. Firmly apply the parking brake to lock the rear wheels.

- If the engine stalls, the 4WD system is normal.
- If the engine continues running, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit.

Automatic Transmission

Starting and accelerating in forward positions (4WD mode)

NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Raise and support the vehicle Service and Repair.

2. Make a mark (A) on either No. 1 or No. 2 propeller shaft (B).





3. Start the engine, and let it idle until the radiator fan comes on at least twice.

4. With the engine at idle, shift to 1.

5. Firmly apply the parking brake to lock the rear wheels, and measure the time it takes the propeller shaft to rotate 10 times.

- If the time is 10 seconds or more, the 4WD system is normal.
- If the time is less than 10 seconds, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit.

Starting and accelerating in R (4WD mode)

NOTE: Do not test repeatedly, or the differential fluid will overheat.

1. Raise and support the vehicle Service and Repair.

2. Make a mark (A) on either No. 1 or No. 2 propeller shaft (B).





3. Start the engine, and let it idle until the radiator fan comes on at least twice.

4. With the engine at idle, shift to R.

5. Firmly apply the parking brake to lock the rear wheels, and measure the time it takes the propeller shaft to rotate 10 times.

- If the time is 10 seconds or more, the 4WD system is normal.
- If the time is less than 10 seconds, there is a problem in the 4WD system. Check the differential fluid first. If the differential fluid is normal, replace the torque control differential (TCD) case kit.

Manual Transmission/Automatic Transmission

Decelerating in forward gears (2WD mode)

1. Block the front wheels (A), raise the left rear wheel, and support it with a safety stand (B) as shown Service and Repair.






2. Hold the left rear tire, and turn it counterclockwise continuously for more than one rotation.

- If the rotation of the wheel does not gradually feel heavy while rotating, the 2WD system when decelerating in a forward gear is normal.
- If the rotation of the wheel gradually feels heavy while rotating, there is a problem in the 2WD system. Check the differential fluid. If the fluid is normal, replace the torque control differential (TCD) case kit.






Decelerating in reverse gear (4WD mode)

1. Block the front wheels (A), raise the left rear wheel, and support it with a safety stand (B) as shown Service and Repair.






2. Hold the left rear tire, and turn it clockwise continuously for more than one rotation.

- If the wheel does not rotate, the 4WD system when decelerating in reverse gear is normal.
- If the wheel rotates, there is a problem in the 4WD system. Check the differential fluid. If the fluid is normal, replace the torque control differential (TCD) case kit.