Component Tests and General Diagnostics

When performing system test procedures, power steering pressures can easily exceed 1000 psi. Extreme caution must be exercised when performing these tests to prevent personal injury.

1. Disconnect high pressure line at power steering pump.
2. Connect power steering analyzer J-25323-B to power steering pressure line at power steering pump.
3. Shift vehicle to park or neutral and set parking brake.
4. Open valve on analyzer, then start engine and allow system to reach operating temperature. Check fluid level and add if necessary.
5. Check and note pressure and flow readings at idle speed. Do not move steering wheel while engine is running, this will give inaccurate pressure readings. Pressure readings should be less than 200 psi. If pressure is above 200 psi, check hoses for restrictions.
6. Partially close valve to build 700 psi and record flow. Subtract flow from flow reading taken in step 5. Flow should not drop more than 1 gallon per minute (GPM). If flow drops more than 1 GPM, replace ring, rotor and vanes in pump. Check if pressure plate and thrust plates are worn or damaged.
7. Close valve fully three times for not more than five seconds each time. All three readings should be within 50 psi of each other. If reading are not within 50 psi or the same, replace flow control valve ensuring it is free to move in its bore.
8. Increase engine speed to 1500 RPM and read flow. Subtract flow from flow reading taken in step 5. Flow should not vary more than 1 GPM. If flow varies more than 1 GPM, remove flow control valve and clean. Do not disassemble flow control valve.
9. Turn steering wheel all the way left and right. Record flow at each stop. Flow should drop below 1 GPM at 1500 RPM at each stop. If flow is OK, check steering gear for leakage.
10. After completing any repairs, remove analyzer and reconnect high pressure line to pump, then bleed system and fill fluid to full level.