Power Steering Pump Pressure Test
Special Tools Required
P/S joint adapter (pump) ( 07RAK-S040111)
or 07RAK-S040110P/S joint adapter (hose) ( 07RAK-S040122)
P/S pressure gauge ( 07406-0010001)
Check the fluid pressure as follows to determine whether the trouble is in the pump or gearbox.
|3.||Remove the pump outlet hose clamp (A) from the intake manifold.|
|4.||Disconnect the pump outlet hose, then install the P/S joint adapter (pump) on the pump (A).|
Take care so as not to spill the power steering fluid on the frame and other parts.
|5.||Install the P/S pressure gauge to the P/S joint adapter (pump).|
|6.||Connect the P/S joint adapter (hose) to the P/S pressure gauge.|
|7.||Connect the pump outlet hose (A) to the P/S joint adapter (hose).|
|8.||Fully open the shut-off valve (A).|
|9.||Fully open the pressure control valve (B).|
|10.||Start the engine, and let it idle.|
|11.||Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature at 70 °C (158 °F).|
|12.||Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should be no more than 1,470 kPa (15 kgf/cm2, 213 psi). If it reads higher, check for:|
- Clogged or deformed pump outlet or return line between the pump and gearbox.
- Clogged valve body unit.
|13.||Raise the engine speed to 3,000 rpm, and measure the fluid pressure. If the pump is in good condition, the gauge should read at least 1,470 kPa (15 kgf/cm2, 213 psi). If it reads higher, repair or replace the pump.|
|14.||Lower the engine speed, and let it idle. Close the shut-off valve, then close the pressure control valve gradually until the pressure gauge needle is stable. Read the pressure.|
Do not keep the shut-off valve closed more than 5 seconds or the pump could be damaged by overheating.
|15.||Immediately open the shut-off valve fully.|
If the pump is in good condition, the gauge should read at least 7,850-8,550 kPa (80-87 kgf/cm2, 1,140-1,240 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.
|16.||Reinstall all removed parts.|