Power Steering Pump Pressure Test
Special Tools Required
P/S joint adapter (pump) ( 07RAK-S040111)
P/S pressure gauge ( 07406-0010201)
Check the fluid pressure as follows to determine whether the trouble is in the pump or gearbox.
|1.||Check the power steering fluid level.|
|2.||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. Install the P/S joint adapter (pump) on the pump outlet (B).|
|3.||Connect the P/S joint adapter (hose) to the P/S pressure gauge, then connect the pump outlet hose to the P/S joint adapter (hose).|
|4.||Install the P/S pressure gauge to the P/S joint adapter (pump).|
|5.||Fully open the shut-off valve (A).|
|6.||Fully open the pressure control valve (B).|
|7.||Start the engine and let it idle.|
|8.||Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature at 70 °C (158 °F).|
|9.||Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the pressure should be no more than 1,470 kPa (15 kgf/cm2, 213 psi). If the pressure is too high, check the outlet hose or valve body unit (see Steering System Troubleshooting).|
Raise the engine speed to 3,000 rpm, and measure the fluid pressure. If the pump is in good condition, the pressure should be at least 1,470 kPa (15 kgf/cm2, 213 psi). If the pressure is too high, repair or replace the pump.
|10.||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.|
|11.||Immediately open the pressure control valve fully. If the pump is in good condition, the gauge should read at least this specification:|
A low reading means pump output is too low for full assist. Repair or replace the pump.