Component Tests and General Diagnostics

1. Disconnect pressure line from gear housing.
2. Connect gauge side of pressure gauge to pressure line and valve side to gear housing side.
3. Bleed power steering system as outlined under Power Steering Bleeding.
4. Start engine, turn steering wheel from lock to lock three or four times, ensuring proper fluid level.
5. Allow fluid temperature to reach at least 176°F.
6. Start engine and allow to idle.
7. Close pressure valve and observe valve reading. Do not keep valve closed for more then 10 seconds. Do not allow fluid temperature to become too high.
8. If observed pressure is below specifications, replace power steering pump.
9. Open valve fully.
10. Check and record pressure reading at 1000 RPM and 3000 RPM, less then 71 psi difference should be indicated from 1000 RPM to 3000 RPM. If difference is higher than indicated, repair or replace power steering pump flow control valve.
11. Ensure valve is fully open with engine at idle, check pressure with steering wheel at full lock. Do not maintain full lock position for more than 10 seconds. Do not allow fluid temperature to become too high.
12. If pressure is below specifications, internal gear housing leak is indicated and must be repaired or replaced.
13. Center steering wheel and allow engine to idle.
14. Using suitable spring scale, measure steering effort in both directions. If steering effort is above specifications, repair power steering unit.