Inspection Procedure 4: Shrill Noise
INSPECTION PROCEDURE 4: Shrill NoiseDIAGNOSIS
STEP 1. Check the fluid level.
1. Park the vehicle on a flat, level surface, and then start the engine.
2. Turn the steering wheel several times to raise the temperature of the fluid to approximately 50 - 60°C (122 - 140°F).
3. With the engine running, turn the wheel all the way to the left and right several times.
4. Check the fluid in the oil reservoir for foaming or milkiness. Check the difference of the fluid level when the engine is stopped, and while it is running. If the fluid contains air or has milky appearance, or the fluid level fluctuate by 5 mm (0.2 inch) or more, power steering system air bleeding should be done.
Q: Is the check result OK?
YES: Go to Step 2.
NO: Bleed the air. And then go to Step 3.
STEP 2. Check for seizure in the oil pump.
Q: Is there seizure?
YES: Replace the part. And then go to STEP 3.
NO: Go to Step 3.
STEP 3. Retest the system.
Confirm that no noise is generated.
Q: Is there noise?
YES: Repeat from Step 1.
NO: The procedure is complete.