Real Time AWD System Symptom Troubleshooting - Abnormal noise
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.

1.
Problem verification (abnormal noise check) 1:

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.
2.
Rear differential visual check:

Rear differential visual check
?1.
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
     
     
     
3.
Problem verification (rear differential companion flange rotate check):

Problem verification (rear differential companion flange rotate check)
?1.
Release the parking brake.

?2.
Shift the transmission to N position/mode.

?3.
Raise the vehicle on a lift.

?4.
Disconnect the No. 2 propeller shaft from the rear differential companion flange.

?5.
Rotate the companion flange by hand.

Can the rear differential companion flange be rotated smoothly by hand?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
4.
Rear differential operation check:

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
     
     
     
5.
Torque control differential (TCD) assembly check:

Torque control differential (TCD) assembly check
?1.
Connect the No. 2 propeller shaft.

?2.
Remove the following fuse.
Fuse
No. A20 (20 A)
Location
Under-hood fuse/relay box

?3.
Test-drive the vehicle on the lift.

Is the abnormal noise still present?

     
YES
     
     
     
     
NO
     
     
     
The torque control differential (TCD) assembly is OK. Reinstall the fuse, then go to step 6.
6.
Rear differential solenoid valve check:

Rear differential solenoid valve check
?1.
Select the FUNCTIONAL TEST in the REAL TIME AWD 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.

  

?4.
Do LEVEL 1 of the SOLENOID TEST with the HDS.

  

Did the abnormal noise happen when changing from LEVEL 7 to LEVEL 1?

     
YES
     
     
     
     
NO
     
     
     
The rear differential solenoid valve is OK. Go to step 7.
7.
Rear differential pump motor check:

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.

  

?3.
Listen for any abnormal noise coming from the rear differential pump motor.

Did abnormal noise happen while doing air bleeding?

     
YES
     
     
     
     
NO
     
     
     
The rear differential pump motor is OK. Go to step 8.
8.
Problem verification (abnormal noise check) 2:

Problem verification (abnormal noise check) 2
?1.
Replace the rear differential fluid.

?2.
Select the ADJUSTMENT in the REAL TIME AWD with the HDS.

?3.
Do the AIR BLEEDING in the ADJUSTMENT with the HDS.

  

?4.
Test-drive the vehicle on the lift.

Did abnormal noise reappear?

     
YES
     
     
     
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?