Power Steering Pump: Testing and Inspection

Power Steering Oil Pump: On-Vehicle Inspection and Service

CHECKING RELIEF OIL PRESSURE

CAUTION:
Before starting work, confirm that the belt tension is within specification.

1) Connect the Tool between the power steering oil pump discharge connector and the high pressure hose, then bleed the air from the hydraulic circuit.








2) Start the engine. Run the engine until the power steering fluid temperature reaches 50 degrees - 80 degrees C (122 degrees - 176 degrees F).

CAUTION:
^ Warm up the engine with the shut-off valve fully opened. If the engine is started with the shutoff valve closed, fluid pressure in the power steering oil pump increases to maximum pressure. This will raise fluid temperature excessively.
^ Do not contact the belt with the hose while the engine is running.

3) With the engine at idle, close the shut-off valve and read the relief oil pressure.

Relief oil pressure: 8.0 - 8.8 mPa (81.60 - 89.76 kg/cm2, 1160 - 1276 psi)

CAUTION:
Do not close the shut-off valve of the pressure gauge for more than 10 seconds.

4) After measurement, open the shut-off valve slowly.
^ If relief oil pressure is outside the specification, replace the power steering oil pump.
5) After inspection, disconnect the oil pressure gauge and oil pressure gauge adapter from the hydraulic circuit, then connect the power steering oil pump discharge connector. Add fluid and bleed the air from the hydraulic circuit thoroughly.