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Real Time AWD System Symptom Troubleshooting Index (AWD)

Symptom  Probable Cause  Remedy 
Rear differential overheats
  • Fluid level too low
  • Incorrect fluid type
Rear differential leaks fluid
  • Fluid level too high
  • Clogged breather hose
  • Worn or damaged oil seal
  • Damaged sealing washer
  • Loose mounting bolts or inadequate sealing
HDS does not communicate with vehicle   Troubleshoot the DLC circuit
HDS does not communicate with real time AWD control unit   Do the symptom troubleshooting for HDS does not communicate - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
AWD system indicator does not come on   Do the symptom troubleshooting for AWD system indicator does not come on - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
AWD system indicator does not go off, and no DTCs are stored   Do the symptom troubleshooting for AWD system indicator does not go off, and no DTCs are stored - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability   Do the symptom troubleshooting for will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
Real time AWD system is stuck in 4WD mode   Do the symptom troubleshooting for real time AWD system is stuck in 4WD mode - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
Abnormal noise (at normal condition)
  • Gear noise
    • Poor gear mesh between ring gear and drive pinion
    • Hypoid gear (wear or damage)
    • Poor pre-road (drive pinion)
    • Debris in hypoid gear area
    • Fluid level too low
    • Distortion of the differential carrier case
  • Bearing noise
    • Bearing (wear or damage)
    • Drive pinion taper bearing (wear)
    • Debris in bearing
  • Pump noise (at lubrication)
    • Debris in pump
    • Rotor (wear or damage)
  • Loose or missed torqued parts
 Do the symptom troubleshooting for abnormal noise - Refer to: Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD) Real Time AWD System Symptom Troubleshooting - HDS does not communicate (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not go off, and no DTCs are stored (AWD) Real Time AWD System Symptom Troubleshooting - Real time AWD system is stuck in 4WD mode (AWD) Real Time AWD System Symptom Troubleshooting - Abnormal noise (AWD) Real Time AWD System Symptom Troubleshooting - AWD system indicator does not come on (AWD) 
Symptom  Probable Cause  Remedy 
Abnormal noise (at start)
  • Gear noise
    • Poor gear mesh between ring gear and drive pinion
    • Hypoid gear (wear or damage)
    • Poor pre-road (drive pinion)
    • Debris in hypoid gear area
    • Fluid level too low
    • Distortion of the differential carrier case
    • Excessive backlash (hypoid gear)
    • Excessive backlash (differential gear)
    • Differential side gear spline (wear)
  • Bearing noise
    • Bearing (wear or damage)
    • Drive pinion taper bearing (wear)
    • Debris in bearing
  • Pump noise (at lubrication)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential pump motor noise
    • Bearing (wear or damage)
    • Debris in rear differential pump motor
  • Pump noise (at control)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential solenoid valve noise
    • Debris in rear differential solenoid valve
    • Plunger area or shaft area (wear)
    • Rear differential solenoid valve (wear or damage)
  • Clutch chatter
    • Fluid deterioration
    • Clutch facing (burnt or deterioration)
    • Clutch plate (deterioration)
  • Loose or missed torqued parts
  
Symptom  Probable Cause  Remedy 
Abnormal noise (at accelerate)
  • Gear noise
    • Poor gear mesh between ring gear and drive pinion
    • Hypoid gear (wear or damage)
    • Poor pre-road (drive pinion)
    • Debris in hypoid gear area
    • Fluid level too low
    • Distortion of the differential carrier case
    • Excessive backlash (hypoid gear)
    • Excessive backlash (differential gear)
    • Differential side gear spline (wear)
  • Bearing noise
    • Bearing (wear or damage)
    • Drive pinion taper bearing (wear)
    • Debris in bearing
  • Pump noise (at lubrication)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential pump motor noise
    • Bearing (wear or damage)
    • Debris in rear differential pump motor
  • Pump noise (at control)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential solenoid valve noise
    • Debris in rear differential solenoid valve
    • Plunger area or shaft area (wear)
    • Rear differential solenoid valve (wear or damage)
  • Clutch chatter
    • Fluid deterioration
    • Clutch facing (burnt or deterioration)
    • Clutch plate (deterioration)
  • Loose or missed torqued parts
  
Symptom  Probable Cause  Remedy 
Abnormal noise (at turning)
  • Gear noise
    • Poor gear mesh between ring gear and drive pinion
    • Hypoid gear (wear or damage)
    • Poor pre-road (drive pinion)
    • Debris in hypoid gear area
    • Fluid level too low
    • Distortion of the differential carrier case
  • Bearing noise
    • Bearing (wear or damage)
    • Drive pinion taper bearing (wear)
    • Debris in bearing
  • Differential gear noise
    • Side gear and pinion gear (wear or damage)
    • Pinion shaft (damage)
    • Debris in differential gear area
  • Clutch chatter
    • Fluid deterioration
    • Clutch facing (burnt or deterioration)
    • Clutch plate (deterioration)
  • Loose or missed torqued parts
  
Abnormal noise (at turning and accelerate)
  • Gear noise
    • Poor gear mesh between ring gear and drive pinion
    • Hypoid gear (wear or damage)
    • Poor pre-road (drive pinion)
    • Debris in hypoid gear area
    • Fluid level too low
    • Distortion of the differential carrier case
    • Excessive backlash (hypoid gear)
    • Excessive backlash (differential gear)
    • Differential side gear spline (wear)
  • Bearing noise
    • Bearing (wear or damage)
    • Drive pinion taper bearing (wear)
    • Debris in bearing
  • Differential gear noise
    • Side gear and pinion gear (wear or damage)
    • Pinion shaft (damage)
    • Debris in differential gear area
  • Pump noise (at lubrication)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential pump motor noise
    • Bearing (wear or damage)
    • Debris in rear differential pump motor
  • Pump noise (at control)
    • Debris in pump
    • Rotor (wear or damage)
  • Rear differential solenoid valve noise
    • Debris in rear differential solenoid valve
    • Plunger area or shaft area (wear)
    • Rear differential solenoid valve (wear or damage)
  • Clutch chatter
    • Fluid deterioration
    • Clutch facing (burnt or deterioration)
    • Clutch plate (deterioration)
  • Loose or missed torqued parts
  
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