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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. Using a scan tool, select SPECIAL FUNCTIONS. Determine if vehicle is equipped with a Service Bay Test for EVAP System. Is the vehicle equipped with EVAP Service Bay Test? If yes, go to next step. If no, go to step  5.
  3. Ensure vehicle is operating within Conditions For Running this procedure. Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Follow scan tool instructions and perform EVAP Service Bay Test. Did the EVAP system pass the Service Bay Test? If yes, go to step  8. If no, go to next step.
  4. Observe scan tool Service Bay Test for an indication of why test did not pass. Example, a failed DTC or test aborted. Repair condition as necessary. After repairs, perform INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE .
    5. NOTE: Once engine is started, DO NOT turn engine off for remainder of procedure until test is complete.
  5. Ensure vehicle is operating with Conditions For Running this procedure. Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Start engine and allow it to idle. Operate vehicle under the following conditions:
    • Acceleration at part throttle to 45 MPH. Maintain this speed until engine reaches normal operating temperature. This may take up to 16 minutes depending on start-up coolant temperature.
    • Continue the operating conditions for an additional 3 minutes after engine reaches normal operating temperature, or until I/M system status indicator updates to YES.
    • Decelerate to zero MPH.
    • Idle engine for 2 minutes, or until I/M system status indicator updates to YES.

    Did the EVAP System Status update to YES? If yes, go to step  8. If no, go to next step.

  6. 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.
  7. 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 . Using scan tool, observe 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 for 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 EVAP System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  8. Using scan tool, observe emission related DTC portion of I/M system status display. If scan tool indicates any emission related DTCs, perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any emission related DTCs, system is okay.
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