P/S System Symptom Diagnosis
P/S SYSTEM SYMPTOM DIAGNOSIS PROCEDURES
| Condition | Possible cause | Correction / Reference Item |
|---|---|---|
| Steering wheel feels heavy (at low speed) | Fluid deteriorated, low viscosity, different type of fluid mixed | Replace fluid . |
| Pipes or hoses deformed, air entering through joint | Replace defective part. | |
| Insufficient air purging from P/S circuit | Purge air. | |
| P/S belt worn, lacking in tension | Check belt tension or replace belt as necessary. | |
| Tire inflation pressure excessively low | Inflate tire. | |
| Front wheel alignment out of order | Check and adjust front wheel alignment. | |
| Steering wheel installed improperly (twisted) | Install steering wheel correctly. | |
| Bind tie-rod end ball joint or lower ball joint | Replace defective part. | |
| P/S pump hydraulic pressure fails to increase | Check pressure and repair or replace defective part. | |
| P/S pump hydraulic pressure increases but slowly | Check pressure and repair or replace defective part. | |
| Steering gear box malfunction | Replace gear box. | |
| Steering wheel feels heavy momentarily when turning it to the left or right | Air drawn in due to insufficient amount of fluid | Add fluid and purge air. |
| Slipping P/S belt | Check belt tension or replace belt as necessary. | |
| P/S pump hydraulic pressure fails to increase | Check pressure and repair or replace defective part. | |
| P/S pump hydraulic pressure increases but slowly | Check pressure and repair or replace defective part. | |
| Steering gear box malfunction | Replace gear box. | |
| Poor recovery from turns (See NOTE.) | Deformed pipes or hoses | Replace defective part. |
| Steering column installed improperly | Install steering column correctly. | |
| Front wheel alignment out of order | Check and adjust front wheel alignment. | |
| Ball joints binding | Replace defective part. | |
| P/S pump hydraulic pressure fails to increase | Check pressure and repair or replace defective part. | |
| P/S pump hydraulic pressure increases but slowly | Check pressure and repair or replace defective part. | |
| Steering gear box malfunction | Replace gear box. |
NOTE:
To check steering wheel for recovery, with vehicle running at 22 mile/h (35 km/h), turn steering wheel 90 ° and let it free. If should return more than 60 °.
REFERENCE ITEM SPECIFICATIONS
| Condition | Possible cause | Correction / Reference Item |
|---|---|---|
| Vehicle pulls to one side during straight driving | Mismatched or uneven tire | Replace tire. |
| Low or uneven tire inflation pressure | Inflate tires to proper pressure or adjust right & left tires inflation pressure. | |
| Brake dragging in one wheel | Repair. | |
| Front wheel alignment out of order | Check and adjust front wheel alignment. | |
| Rear wheel alignment out of order | Check and adjust rear wheel alignment. | |
| Malfunction of control valve in gear box | Replace gear box. | |
| Steering wheel play is large and vehicle wanders | Refer to STEERING SYMPTOM DIAGNOSIS . | Refer to STEERING SYMPTOM DIAGNOSIS . |
| Fluid leakage | Loose joints of (hydraulic pressure) pipes and hoses | Retighten. |
| Deformed or damaged pipes or hoses | Replace defective part. | |
| Abnormal noise | Air drawn in due to insufficient amount of fluid | Add fluid and purge air. |
| Air mixed into fluid from pipes or hoses | Replace pipes or hoses. | |
| Slipping (loose) P/S belt | Check belt tension. | |
| Worn P/S belt | Replace belt. | |
| Loose gear box fastening bolt | Retighten bolts. | |
| Loose linkage or joints | Retighten. | |
| Pipes or hoses in contact with part of vehicle body | Install pipes and hoses correctly. | |
| Vanes of P/S pump defective | Replace defective part. | |
| Malfunction of control valve in gear box | Replace gear box. | |
| Bearing of P/S pump shaft defective | Replace bearing. |