Component Tests and General Diagnostics

STEERING FLOW AND PRESSURE

The following procedure is used to test the operation of the Power Steering System on the vehicle. This test will provide the Gallons Per Minute (GPM) or flow rate of the Power Steering Pump along with the maximum relief pressure. Perform the test any time a Power Steering System problem is present. This test will determine if the Power Steering Pump or the Power Steering Gear is functioning properly. The following pressure and flow test is performed using the standard shop tool "Power Steering Analyzer Tool Kit #6815" and the "Adapter Kit #6893".






FLOW AND PRESSURE TEST

1. Check the accessory drive belt to ensure it is in good condition and adjusted properly.
2. Connect the pressure gauge hose (4) from the "Power Steering Analyzer" to the Tube 6865.
3. Connect the Adapter (1) 6826 to the Power Steering Analyzer test valve end.
4. Disconnect the high pressure hose from the power steering pump.
5. Connect the Tube 6865 onto the pump hose fitting.
6. Connect the power steering hose from the steering gear to the Adapter 6826.
7. Open the test valve completely.
8. Start the engine and let it idle long enough to circulate power steering fluid through the flow/pressure test gauge.
9. Shut the engine off and check the fluid level, add fluid as necessary. Start the engine again and let it idle.
10. The initial pressure reading should be 345-552 kPa (50-80 psi). If the pressure is higher inspect the hoses for restrictions and repair as necessary.
11. Increase the engine speed to 1500 RPM and read the flow meter. The reading should be 2.4 - 2.8 GPM. If the reading is below this specification, the pump should be replaced.

CAUTION: This next step involves testing maximum pump pressure output and flow control valve operation. Do not leave the valve closed for more than three seconds as the pump could be damaged.

12. Close the valve fully three times for three seconds and record the highest pressure indicated each time. All three readings must be at pump relief pressure specifications and within 345 kPa (50 psi) of each other.
- If pressure is above the specifications but not within 345 kPa (50 psi) of each other, replace the pump.
- If pressure is within 345 kPa (50 psi) of each other but below the specifications, replace the pump.

CAUTION: Do not force the pump to operate against the stops for more than 2 to 4 seconds at a time. Pump damage could result.

13. Open the test valve and turn the steering wheel to the extreme left and right positions against the stops. Record the highest pressure reading at each position. Compare readings to the pump specifications chart. If the pressure readings are not within 50 psi. of each other, the gear is leaking internally and must be repaired.

Pump Specifications: