Component Tests and General Diagnostics

57.90.10.01 Power steering pressure test - V8
Before disconnecting the battery, ensure all text and cautions are observed.

Check
1. Position vehicle on lift.
2. Disconnect battery earth lead.
3. Siphon PAS fluid from reservoir.
4. Remove undertray.





5. Position a suitable container below PAS pump.





6. Loosen union nut, disconnect PAS outlet hose from pump and discard O-ring.
7. Fit adaptor LRT-57-034A to high pressure port of PAS pump.
8. Fit adaptor LRT-57-035t to existing high pressure hose.
9. Fit hose LRT-57-002 to each adapter.
10. Fit pressure gauge LRT-57-005 to test valve LRT-57-001
11. Connect hoses LRT-57-002 to LRT-57-001 and tighten unions.
12. Connect battery earth lead.
13. Ensure steering system and test equipment are free from leaks.
14. Maintain maximum fluid level during test.
15. With the test valve open, start the engine.
16. With the engine at idle, slowly turn the steering wheel and hold on full lock.
17. Repeat procedure for other lock.
18. Record pressure reading.
19. With the engine at idle, release the steering wheel. Pressure should read below 7 bar.
20. Pressures outside the above tolerance indicates a fault.
21. To determine if fault is in steering pump or steering rack, close the test valve for a maximum of 5 seconds.

CAUTION: Pump damage will occur if test valve is closed for longer periods.

22. If figures recorded fall outside the values given in General data, replace the PAS pump.
23. If maximum pump pressure is correct, suspect the steering rack.
24. On completion stop engine, disconnect battery earth lead and siphon fluid from PAS reservoir.
25. Dismantle test equipment.
26. Clean PAS pump and pipe union.
27. Fit new O-ring to high pressure outlet pipe union, align to PAS pump and tighten PAS pump high pressure pipe union to 25 Nm (18 ft. lbs.).
28. Remove container from below PAS pump.
29. Dispose of PAS fluid and clean container.
30. Connect battery earth lead.
31. Refill and bleed PAS system.
32. Fit undertray.