Power Steering Oil Pump

On-Vehicle Inspection and Service

CHECKING RELIEF OIL PRESSURE

CAUTION: Make sure that belt tension is normal before starting the following procedure.





1. Connect the hydraulic pressure gauge [SST] between oil pump discharge connector and high-pressure hose. Bleed air from the hydraulic circuit while opening valve fully.
2. Start engine. Run engine until oil temperature reaches 50 to 80 degreesC (122 to 176 degreesF).

CAUTION:
^ Leave the valve of the hydraulic pressure gauge [SST] fully open while starting and running engine. If engine is started with the valve closed, the hydraulic pressure in oil pump goes up to the relief pressure along with unusual increase of oil temperature.
^ Be sure to keep hose clear of belts and other parts when engine is started.

3. Fully close the hydraulic pressure gauge [SST] valve with engine at idle and measure the relief oil pressure.
Standard
Relief pressure: Refer to PS-43, "Oil Pump". Specifications

CAUTION: Never keep valve closed for 10 seconds or longer.

4. Open the valve slowly after measuring. Repair oil pump if the relief oil pressure is outside the standard.
5. After inspection, disconnect the hydraulic pressure gauge [SST] from hydraulic circuit, then add fluid and bleed air.