GM Service Manual Online
For 1990-2009 cars only

Important: The following steps must be completed before using the symptom tables:

  1. Determine whether the vehicle is equipped with an electrically assisted or active suspension system. Perform electrical diagnosis prior to beginning mechanical diagnosis. Refer to Diagnostic Starting Point - Air Suspension in Air Suspension.
  2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to the appropriate description and operation:
  3. •  General Description in Front Suspension
    •  General Description in Rear Suspension
    •  General Description in Tires and Wheels

Visual/Physical Inspection

    • Inspect for aftermarket devices which could affect the operation of any of the suspension subsystems.
    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect for proper tire size and inflation pressure. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label in General Information.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Ride Diagnosis
    •  Vehicle Leads/Pulls
    •  Body Leans or Sways in Corners
    •  Suspension Bottoms
    •  Memory Steer
    •  Poor Directional Stability
    •  Noise Diagnosis - Front Suspension
    •  Noise Diagnosis - Rear Suspension
    •  Suspension Strut and Shock Absorber Testing - On Vehicle
    •  Wheel Bearings Diagnosis
    •  Radial Tire Lead/Pull Correction in Tires and Wheels