AWD System Symptom Troubleshooting - Abnormal noise (AWD)
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 the 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 wheels 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. Release the parking brake.
-2. Shift the transmission to N position.
-3. Raise the vehicle on a lift .
-4. Make a reference mark (A) across the No. 2 propeller shaft and the rear differential companion flange.
-5. Remove the No. 2 propeller shaft flange bolts 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
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. 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. Realign the reference marks (A) on the No. 2 propeller shaft and the rear differential companion flange, then install new No. 2 propeller shaft flange bolts.
-2. Remove the following fuse.
Fuse No. C39 (10 A) Location Under-hood fuse/relay box -3. 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. Go to step 6.
- Rear differential solenoid valve check
-1. Select FUNCTIONAL TEST in the AWD WITH INTELLIGENT CONTROL with the HDS.
-2. Select the SOLENOID TEST in the FUNCTIONAL TEST with the HDS.
-3. 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 ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL 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. Replace the rear differential fluid .
-2. Select ADJUSTMENT in the AWD WITH INTELLIGENT CONTROL with the HDS.
-3. 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.