Real Time AWD System Symptom Troubleshooting - Abnormal noise
NOTE: If necessary, compare the noise with a known-good vehicle of the same type, if the noise is remarkably abnormal, do the following troubleshooting.
- Problem verification (abnormal noise check) 1
-1. Test-drive the vehicle and check for the abnormal noise.
Did abnormal noise reappear?
YES
The failure is duplicated. Go to step 2.
NO
Check the following items.
- Check the rear differential fluid level and the fluid condition .
- Check for rear differential fluid leaks.
- Check for interference with items such as the harness.
- Rotate either rear wheel by hand, and check that the other wheel rotates.
- Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS .
- Do the rear differential fluid pressure sensor test .
- Rear differential visual check:
Check the following items.
- Check the rear differential fluid level and the fluid condition .
- Check for rear differential fluid leaks.
- Check for interference with items such as the harness.
Are the check results OK?
YES
The rear differential visual is OK. Go to step 3.
NO
Replace the rear differential fluid or add recommended fluid .
- Problem verification (rear differential companion flange rotate check)
-1. Raise the vehicle on a lift .
-2. Release the parking brake.
-3. Shift the transmission to N position/mode, then enter the neutral position holding mode .
-4. Do the 12 volt battery terminal disconnection procedure .
-5. Disconnect the No. 2 propeller shaft from the rear differential companion flange .
-6. Rotate the companion flange by hand.
Can the rear differential companion flange be rotated smoothly by hand?
YES
The companion flange rotate is OK. Go to step 4.
NO
The failure is duplicated. Replace the torque control differential (TCD) assembly or the differential carrier assembly .
- Rear differential operation check
-1. Connect the No. 2 propeller shaft .
-2. Do the 12 volt battery terminal reconnection procedure .
-3. Rotate either rear wheel by hand, and check that the other wheel rotates.
Does the other wheel rotate?
YES
The rear differential operation is OK. Go to step 5.
NO
- Torque control differential (TCD) assembly check
-1. Remove the following fuse.
Fuse No. A4-3 No. B7 -2. Test-drive the vehicle on the lift.
Is the abnormal noise still present?
YES
Replace the torque control differential (TCD) assembly .
NO
The torque control differential (TCD) assembly is OK. Reinstall the fuse, then go to step 6.
- Rear differential solenoid valve check
-1. Turn the vehicle to the ON mode.
-2. Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.
-3. Select the SOLENOID TEST in the FUNCTIONAL TEST with the HDS.
-4. Do LEVEL 7 of the SOLENOID TEST with the HDS.
Solenoid Test
Do LEVEL 1 of the SOLENOID TEST with the HDS.
Solenoid Test
Did the abnormal noise happen when changing from LEVEL 7 to LEVEL 1?
YES
Replace the rear differential solenoid valve .
NO
The rear differential solenoid valve is OK. Go to step 7.
- Rear differential pump motor check
-1. Select the ADJUSTMENT in the REAL TIME AWD with the HDS.
-2. Do the AIR BLEEDING in the ADJUSTMENT with the HDS .
Air Bleeding
Listen for any abnormal noise coming from the rear differential pump motor.
Did abnormal noise happen while doing air bleeding?
YES
Replace the rear differential pump motor .
NO
The rear differential pump motor is OK. Go to step 8.
- Problem verification (abnormal noise check) 2
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Replace the rear differential fluid .
-3. Turn the vehicle to the ON mode.
-4. Select the ADJUSTMENT in the REAL TIME AWD with the HDS.
-5. Do the AIR BLEEDING in the ADJUSTMENT with the HDS .
Air Bleeding
Test-drive the vehicle on the lift.
Did abnormal noise reappear?
YES
The failure is duplicated. Replace the torque control differential (TCD) assembly or the differential carrier assembly .
NO
Intermittent failure, the system is OK at this time.