Symptom Chart
| SYMPTOM | POSSIBLE CAUSES | ACTION |
|---|---|---|
| Vibration through the vehicle body at a specified speed or vibration through the body at all speeds | Road wheel imbalance | Road test the vehicle. If the vibration is only at a specified speed, balance the road wheels and retest. REFER to: WHEEL AND TIRE ASSEMBLY BALANCING . |
| Rear driveshaft imbalance | Check the rear driveshaft for grease loss from joints. Check plunge of driveshaft joint. Rotate driveshaft by 180 degrees and re-test. Handle driveshaft with care | |
| Front driveshaft imbalance | Check the front driveshaft for grease loss from joints. Check plunge of driveshaft joints. Rotate driveshaft by 180 degrees and re-test. Handle driveshaft with care | |
| Rear driveshaft center support bearing | Check the center support bearing for damage or deterioration. Rectify as necessary | |
| Loose center bolts | Check center bolts for being disconnected or loose. Rectify as necessary. | |
| Balance weights | Check for missing or damaged balance weights on the driveshaft tubes (no paint present under balance weight). Rectify as necessary | |
| Rear driveshaft dampers | Check the dampers are secured inside rear driveshaft tube by rotating driveshaft. Rectify as necessary | |
| PTU /Front driveshaft joint | Check the PTU /Front driveshaft fixings for being disconnected or loose. Check the front joint is installed correctly to the PTU . Rectify as necessary | |
|
NOTE:
Only for L551 19MY onwards, L550 20MY onwards and X540 21MY onwards RDU/Rear driveshaft joint |
Check the RDU/Rear driveshaft nut for being disconnected or loose. Disconnect the nut and check the circlip and O-ring is present on RDU pinion. Rectify as necessary | |
|
NOTE:
Only for L538, L550 15-19MY and X540 18-20MY RDU/Rear driveshaft joint |
Check the RDU/Rear driveshaft fixings for being disconnected or loose. Check the rear joint is installed correctly to the RDU. Rectify as necessary | |
|
NOTE:
Only for L551 19MY onwards, L550 20MY onwards and X540 21MY onwards RDU pinion |
Check the RDU pinion for run out. Rectify as necessary | |
| Rumbling noise from the rear of the vehicle varying at different vehicle speed and load | Rear driveshaft center support bearing worn | Using a suitable listening device (for example stethoscope) listen to the center support bearing. Rectify as necessary |
| Rear wheel bearings worn | Using a suitable listening device (for example stethoscope) listen to the rear wheel bearings. Rectify as necessary | |
| Rear Drive Unit (RDU) bearings worn | Using a suitable listening device (for example stethoscope) listen to the RDU pinion and output bearings. Rectify as necessary | |
| Rattle | Heatshield disconnected or loose | Check the integrity of the heatshield around the driveshaft. Rectify as necessary |