Pump Pressure Test with T/N 07406-0010001

Special Tools Required

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

Check the power steering fluid level (see Fluid Replacement ) and pump belt tension (see PUMP BELT INSPECTION & ADJUSTMENT ).
Remove the intake manifold cover (see INTAKE MANIFOLD REMOVAL & INSTALLATION ).
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.

Fig 1: Installing The P/S Joint Adapter
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Connect the P/S joint adapter (hose) to the P/S pressure gauge, then connect the pump outlet hose (A) to the P/S joint adapter (hose).
Install the P/S pressure gauge to the P/S joint adapter (pump).
Fully open the shut-off valve (A).

Fig 2: Identifying The Valves
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fully open the pressure control valve (B).
Start the engine and let it idle.
Turn the steering wheel from lock-to-lock several times to warm the fluid to operating temperature.
Measure steady-state fluid pressure while the engine is idling. If the pump is in good condition, the gauge should read no more than 1,500 kPa (15 kgf/cm² , 213 psi).
If it reads high, check for:
- Clogged or deformed feed or return line between the pump and gearbox.
- Clogged valve body unit.

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

Close the shut-off valve, then close the pressure control valve gradually until the pressure gauge needle is stable. Read the pressure.
Immediately open the shut-off valve fully. If the pump is in good condition, the gauge should read at least 8,300-8,800 kPa (85-90 kgf/cm² , 1,210-1,280 psi). A low reading means pump output is too low for full assist. Repair or replace the pump.