Pump Pressure Test With T/N 07406-001000A
Check the fluid pressure as follows to determine whether the trouble is in the pump or power rack and pinion.
- Check the power steering fluid level and pump belt tension. See BELT TENSION and FLUID REPLACEMENT under ADJUSTMENTS and LUBRICATION.
- Disconnect the pump outlet hose 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 07VAK-P8A011A) on the pump outlet with the P/S Joint Outlet Plate (pump 07VAK-8A012B). See Fig 1.
- Connect the P/S Joint Adapter (hose 07RAK-S040121) to the P/S pressure gauge (07406-001000A), then connect the pump outlet hose to the P/S joint adapter hose. Install the P/S pressure gauge to the P/S joint adapter pump.
- Fully open the pressure control valve. Start the engine and let it idle. Turn the steering wheel from the lock-to-lock several times to warm the fluid to operating temperature. Measure the steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should read less than 213 psi (1500 kPa). If it reads high, check for:
- Clogged or deformed feed or return line between the pump and power rack and pinion.
- Clogged valve body unit.
- Close the pressure control valve gradually and read pressure.NOTE: Do not keep the pressure control valve closed more than 5 seconds or the pump could be damaged by over-heating.
- Immediately open the pressure control valve fully. If the pump is in good condition, the gauge should read at least 1110-1210 psi (7600-8300 kPa). A low reading means pump output is too low for full assist. Repair or replace the pump.