Diagnostic Process

When servicing the Speed Dependent Steering Electronic Variable Orifice (EVO) system, the following steps should be followed in order. Failure to follow these steps may result in the loss of important diagnostic data and may lead to difficult and time-consuming diagnostic procedures:
1. Perform a vehicle preliminary diagnostic inspection.
2. Perform a Power Steering System Test. Component Tests and General Diagnostics
3. Perform the Diagnostic System Check. Diagnostic System Check
^ If any DTC's are displayed, note the last malfunction that occurred. Diagnose and repair this malfunction first.
4. If no DTC's or mechanical component malfunctions are present, or if the failure is intermittent and not reproducible, test drive the vehicle while using the automatic snapshot feature of the scan tool. Perform normal acceleration, stopping, and turning maneuvers. If this does not reproduce the malfunction, refer to intermittent diagnosis. Intermittent and Poor Connections
5. Once all system malfunctions have been corrected, clear the EVO DTC's and test drive the vehicle.