Checking the pump pressure
Check the fluid pressure as follows to determine if the pump or steering rack is faulty.
Note: First check the power steering fluid level and pump belt tension.
Caution: Disconnect the high pressure hose carefully to avoid spilling power steering fluid onto the subframe and other parts.
1. Disconnect the pump outlet hose and install the adapter block on the pump outlet.
2. Connect the adapter block hose to the steering gear pressure gauge, then connect the outlet hose to the adapter block (hose).
3. Connect the steering gear pressure gauge to the pump adapter block as shown below.
4. Open the shut-off valve fully.
5. Open the pressure control valve fully.
6. Start the engine and let it idle.
7. Turn the steering wheel from lock to lock several times to warm the fluid to operating temperature.
8. Measure the steady-state fluid pressure when running at idle speed with the shut-off valve fully open. If the pump is in good condition, the pressure gauge should show at least 1500 kPa (15 kgf/cm).
If the pressure gauge reading is higher, check the supply line or valve assembly.
9. Close the shut-off valve, then gradually close the pressure control valve until the pressure gauge needle stops. Measure the readings.
10. Immediately open the shut-off valve completely.
Caution: Do not leave the shut-off valve closed for more than 5 seconds, otherwise the pump may be damaged by overheating.
Left hand drive:
- 6,400 - 7,400 kPa (65- 75 kgf/cm²)
Right hand drive:
- 5,400 - 6,400 kPa (55- 65 kgf/cm²)
Low readings indicate that the pump output pressure is too low to provide assist force. Repair or replace the pump.
