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Diagnostic Procedures

  1. If I/M system check has been performed, go to next step. If I/M system check has not been performed, 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.
  2. Ensure that the vehicle is within the Conditions for Running. Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Start engine and allow it to idle for 2 minutes. Accelerate at part throttle to 45 MPH and maintain speed for 3 minutes or until I/M system status indicator updates to YES. Using scan tool, monitor I/M system status display. Did the AIR System Status update to YES? If yes, go to step  5. If no, go to next step.
  3. Using scan tool, observe DTC information. Does the scan tool indicate any failed DTCs? If yes, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. Refer to the Inspection/Maintenance (I/M) System DTC Table to determine which DTCs are required to run in order to complete this test. See INSPECTION/MAINTENANCE SYSTEM DTCS  under INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE. 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 of the DTC. Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat procedure for any additional required DTCs that have not run. With a scan tool, observe the I/M System Status display. Did the AIR System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. Using scan tool, observe emission related DTC portion of I/M system status display. Does the scan tool indicate any Emission Related DTCs set? If yes, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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