Initial Inspection and Diagnostic Overview

Diagnostic Starting Point - Power Steering System

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

1. Perform the Diagnostic System Check - Vehicle, before using the Symptom Tables in order to verify that all of the following are true: Testing and Inspection
^ There are no DTCs set.
^ The control module can communicate via the serial data link.
^ The EPS assembly has not been damaged from a collision, or air bag deployment.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to Power Steering System Description and Operation.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Electric Power Steering (EPS) System. Refer to Checking Aftermarket Accessories. Component Tests and General Diagnostics
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
^ Inspect the vehicles battery and charging system for the proper voltage levels.

Intermittent
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

Symptom List
Refer to Symptoms - Power Steering System in order to diagnose the symptom: Symptom Related Diagnostic Procedures