Component Tests and General Diagnostics

^ Tools Required:
- J 5176-E Power Steering Pressure Test Gage and Hose
- J 35465 Power Steering Pressure Tester Adapter Hose
- J 41380 Power Steering Pressure Tester Adapter Kit
- Or Equivalents

1. One 10 mm bolt retaining high pressure hose and pipe to core support. Disconnect high pressure hose to high pressure pipe at core support.
2. Use power steering pressure gage, power steering pressure test hose and adapter kit. Connect the gage side of the pressure gage to the pressure hose from the pump and valve side of the gage to pressure line to the rack.
3. Bleeding power steering system.

4. Bleed the system, then start the engine and turn the steering wheel from the right and left stops two or three times.
5. Check that the fluid level is correct.
6. Shut off the engine and check that the fluid temperature is at least 80°C (176°F).
7. Start engine and run at idle.
8. Check back pressure, with the valve open, engine idling the pressure reading should be no more than 980 kPa (142 psi). If the pressure reading is more than 980 kPa, check the hoses for restrictions or control valve.

CAUTION: Do not leave the valve closed for more than 10 seconds. This could result in damage to the power steering system.

9. Check the fluid pressure reading with the valve closed. Close the valve and observe the reading on the gage. If the pressure gage reading is below 5700 kPa (825 psi), repair or replace the power steering pump. If the pressure gage reading is higher than 6400 kPa (924 psi), possible cause is malfunction of relief valve.
10. Engine idle at 1,500 and valve open. Turn the steering wheel to the right or left fully and take a pressure reading. The gage reading should be no lower than 5700 kPa (825 psi) and no higher than 6700 kPa (924 psi). If the pressure gage reading is lower than 5700 kPa (825 psi) repair or replace the rack and pinion. If the reading is higher than 6400 kPa (924 psi) repair or replace the relief valve.