GM Service Manual Online
For 1990-2009 cars only

Perform a road test before diagnosis. Consider the following systems during the diagnosis:

    • The suspension system
    • The tires and wheels
    • Inspect the tires for incorrect air pressure and uneven wear.
    • Inspect the joints, from the steering column to the steering gear, for loose connectors or wear.
    • Inspect the following components for any loose or damaged components:
       - The front suspension
       - The rear suspension
       - The steering gear
       - The linkage
    • Inspect the tires for the following conditions:
       - Out-of-round tires
       - Out-of-balance tires
       - Bent wheels
       - Loose or rough wheel bearings
    • Inspect the power steering system for leaks. Refer to Power Steering Gear and Pump Leaks .
    • Inspect the power steering fluid level.Refer to Checking and Adding Power Steering Fluid .