Power Steering Pump Pressure Test With T/N 07406-0010001

Power Steering Pump Pressure Test with T/N 07406-0010001

Special Tools Required

- P/S Joint Adapter (Pump) 07VAK-P8A011A
- P/S Joint Adapter Plate (Pump) 07VAK-P8A012B
- Hose Joint Adapter 07RAK-S040122
- P/S Pressure Gauge 07406-0010001

Check the fluid pressure as follows to determine whether the trouble is in the pump or steering gearbox.

1. Remove the right upper fender trim .

2. Check the power steering fluid level Testing and Inspection.

3. Disconnect the pump outlet hose (A) from the pump outlet with care so as not to spill the power steering fluid on the frame and other parts, then install the P/S joint adapter (pump) on the pump outlet (B) with the P/S joint outlet plate (pump).





4. Connect the hose joint adapter to the P/S pressure gauge, then connect the pump outlet hose to the hose joint adapter.

5. Install the P/S pressure gauge to the P/S joint adapter (pump).

6. Fully open the shut-off valve (A).





7. Fully open the pressure control valve (B).

8. Start the engine, and let it idle.

9. Turn the steering wheel from lock to lock several times to warm the fluid to operating temperature at 158 °F (70 °C).

10. Measure steady-state fluid pressure while the engine is idling. The gauge should read no more than 1,470 kPa (14.99 kgf/cm2, 213.2 psi).

If the reading is high, check for:

- Clogged or deformed inlet or return lines between the pump and the steering gearbox.
- Clogged valve body unit.

11. Close the shut-off valve, then close the pressure control valve gradually until the pressure gauge needle is stable. Read the pressure.

NOTICE
Do not keep the shut-off valve closed for more than 5 seconds or the pump could be damaged by over-heating.

12. Immediately open the shut-off valve fully. If the pump is in good condition, the gauge should read at least 9,400-9,800 kPa (95.85-99.93 kgf/cm2, 1,363.4-1,421.4 psi). A low reading means the pump output is too low for full assist. Repair or replace the pump.