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. Refer to [Checking Drive Belts] Testing and Inspection (QR25DE), [Checking Drive Belts] Testing and Inspection (VQ40DE).

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. Refer to [Air Bleeding Hydraulic System] Service and Repair.











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

CAUTION:
- Warm up the engine with the shut-off valve fully opened. If the engine is started with the shut-off 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.
[Power Steering Oil Pump: Removal and Installation] Power Assisted Steering System





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. Refer to Removal and Installation.
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. Refer to [Air Bleeding Hydraulic System] Service and Repair.