Perform the following steps when servicing the speed dependent steering electronic variable orifice (EVO) system. 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. Refer to Power Steering System Test in Power Steering System.
3. Perform the Diagnostic System Check. If any DTCs are displayed, note the last malfunction that occurred. Diagnose and repair this malfunction first.
4. If no DTCs or mechanical component malfunctions are present or if the failure is intermittent and not reproducible, test drive the vehicle. Use the automatic snapshot feature of the scan tool during the test drive. Perform normal acceleration, stopping and turning maneuvers. If this does not reproduce the malfunction, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
5. Once all system malfunctions have been corrected, clear the EVO DTCs.
6. Test drive the vehicle.