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Home >> Saturn >> 2003 >> Ion 1 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Drive Cycles >> Inspection/Maintenance Evaporative Emission System Set Procedure >> Diagnostic Procedure
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Diagnostic Procedure

  1. Did you perform the Inspection/Maintenance (I/M) system check? If yes, go to next step. If no, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
    2. WARNING: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
    NOTE: Once engine is started, DO NOT turn engine OFF for the remainder of the procedure until test is complete.
  2. Ensure vehicle is within the Conditions for Running Test. See CONDITIONS FOR RUNNING TEST . Turn all of the accessories OFF, e.g., A/C, blower fan, etc. Start engine and let idle. Accelerate at part throttle to 45 MPH and maintained speed until engine reaches operating temperature. This may be up to 8-10 minutes depending on the start up coolant temperature. Continue the operating conditions for an additional 3 minutes after the engine reaches operating temperature, or until the I/M System Status indicator updates to YES. Decelerate to zero MPH. Operate engine at idle 2 minutes. Did the EVAP System Status update to YES? If yes, go to step  5. If no, go to next step.
  3. Using a scan tool, observe the DTC Information. Does the scan tool indicate any failed DTCs? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. Determine which DTCs are required to run in order to complete this test. See INSPECTION/MAINTENANCE SYSTEM DTCS . Using a scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Enter the DTC number in the SPECIFIC DTC menu of the scan tool. Operate the vehicle within the Conditions for Running Test. See CONDITIONS FOR RUNNING TEST . Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat this step for any additional required DTCs that have not run. Using a scan tool, observe the I/M System Status display. Did the EVAP System Status update to YES? If yes, go to next step.
  5. Using a scan tool, observe the emission related DTC portion of the I/M System Status display. Does the scan tool indicate any emission related DTCs set? If yes, DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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