Initial Inspection and Diagnostic Overview

Diagnostic Starting Point - Power Steering System

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 (Electronic Power Steering) Power Steering System Description and Operation (Hydraulic Power Steering).

Visual/Physical Inspection
^ Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
^ 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. Steering Column

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. Testing and Inspection
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. Testing and Inspection