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Inspection/Maintenance Evaporative Emission System Set Procedure: Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Inspection/Maintenance (I/M) System Check? If yes, go to next step. If no, see 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.
  2. Ensure the vehicle is within the Conditions for Running specified in the supporting text. Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Start the engine and allow the engine to idle. For this test to run, the vehicle must operate in the following conditions:
    • Acceleration at part throttle to 45 MPH with this speed maintained until the engine reaches operating temperature. This may take up to 8-10 minutes depending on the start up coolant temperature. Continue the operating conditions for additional 3 minutes after the engine reaches operating temperature.
    • Deceleration to zero MPH.
    • Engine idling for 2 minutes while the following criteria is maintained.
    • Turn OFF the ignition for one hour.
    • After one hour, turn ON ignition.

    With a scan tool, observe the I/M System Status display. Did the Catalyst System Status update to YES? If yes, go to step  5. If no, go to next step.

  3. Observe the DTC information with scan tool. If the scan tool indicates any failed DTC, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If not, go to next step.
  4. To determine which DTCs are required to run in order to complete this test, see INSPECTION/MAINTENANCE SYSTEM DTCS  table. With 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 DTC. Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat this procedure for any additional required DTCs that have not run. With a scan tool, observe the I/M System Status display. Did the EVAP System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. With 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, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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