For 1990-2009 cars

### System Familiarization

Review the electric power steering system operation in order to familiarize yourself with the correct system functions and operations. Refer to Power Steering System Description and Operation .

### Visual/Physical Inspection

• | Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

• | Inspect for aftermarket components, such as tires or wheels, which could affect the operation and/or performance of the power steering system.

• | Inspect the steering column for accident damage. Refer to Steering Column Accident Damage Inspection .

### System Diagnosis

After incorrect system operation has been verified, and that aftermarket devices or intermittent conditions are not the cause, begin the system diagnosis with the Diagnostic System Check - Vehicle. The Diagnostic System Check - Vehicle will provide the following information:

1. The identification of the control modules that control the Power Steering System.
2. The ability of those control modules to communicate via the serial data circuit.
3. The presence of any stored DTCs in those control modules and there status.

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the malfunction and where the procedure is located. Refer to Diagnostic System Check - Vehicle .