| Hiss noise (continuous) While engine is running. | Relief valve emits operating sound when steering wheel is completely turned in either direction. (Do not keep this condition for 5 seconds or more.) | Normal |
| Relief valve emits operating sound when steering wheel is not turned. This means that the relief valve is defective. | Replace the oil pump. |
| Rattling noise (intermittent) While engine is running. | Interference with adjacent parts | Check the parts for deformation. Replace or adjust if necessary. |
| Loosened installation of oil pump, oil tank, pump bracket, gearbox or crossmember | Retighten. |
| Loose oil pump pulley or other pulley(s) | Retighten. |
| Looseness of linkage, play of steering, improper tightening (looseness) of suspension joint or steering column | Retighten or replace. |
| Sound generates from the inside of gearbox or oil pump. | Replace faulty parts in the gearbox or oil pump. |
| Knocking When turning steering wheel in both directions with small angle repeatedly at engine ON or OFF. | Excessive backlash Loosened lock nut for adjusting backlash | Adjust and retighten. |
| Insufficient tightening or play in the tie-rod or tie-rod end | Retighten or replace. |
| Grinding noise (continuous) While engine is running. | Air in vane pump | Inspect and retighten the fluid line connection. Refill the fluid and vent air. |
| Vane pump seizing | Replace the oil pump. |
| Oil pump pulley bearing seized | Replace the oil pump. |
| Folded hose, flattened pipe | Replace. |
| Squeal, squeak (intermittent or continuous) While engine is running. | Improper adjustment of pulley belt Damaged or over tensioned pulley belt Unequal length of pulley belts | Adjust or replace. |
| Runout or dirty V-groove surface of oil pump pulley | Clean or replace. |
| Sizzling noise (continuous) While engine is running. | Fluid aeration | Fix the faulty part causing aeration. Replace the fluid and vent air. |
| Damaged pipe of gearbox | Replace the pipe. |
| Faulty inside of hose or pipe Flattened hose or pipe | Repair or replace. |
| Abnormal inside of oil tank | Replace. |
| Removed oil tank cap | Install cap. |
| Whistle (continuous) While engine is running. | Faulty pipe of gearbox or faulty hose | Replace the faulty parts of the gearbox or the hose. |
| Whine or growl (intermittent or continuous) While engine is running with/without steering turned. | Looseness of oil pump, oil pump bracket attachment | Retighten. |
| Fault inside of oil pump or hose | Replace the oil pump or hose, if the noise can be heard when vehicle is running as well as being stopped. |
| Torque converter growl, air conditioner compression growl | Remove the power steering pulley belt and check. |
| Grinding noise (continuous) When engine operates (when operating steering wheel) | Fault inside of gearbox | Replace the faulty parts of gearbox. |
| Faulty steering shaft bearing | Apply grease or replace. |
| Occurs when turning the steering wheel with brakes (service or parking) applied. | If the noise goes off when brake is released, it is normal. |
| Vibration While engine is running with/without steering turned. | Engine speed is too low. | Adjust, and notify customer. |
| Air in vane pump | Repair faulty part Vent air. |
| Damaged valve in oil pump or gearbox | Replace the faulty parts in gearbox and oil pump. |
| Excessive play in steering, looseness of suspension parts | Retighten. |
