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Home >> Chevrolet >> 2002 >> Cavalier Z24, 2D Coupe, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 2.4L >> Inspection/Maintenance Procedures >> Inspection/Maintenance EVAP System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

  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. Using a scan tool, select Special Functions. Determine if the vehicle is equipped with a Service Bay Test for the EVAP system. Is vehicle equipped with EVAP Service Bay Test? If yes, go to next step. If no, go to step  5 .
  3. Ensure the vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING  . Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Following the directions on the scan tool, perform the EVAP Service Bay Test. Did EVAP system pass the Service Bay Test? If yes, go to step  8 . If no, go to next step.
  4. Observe the scan tool Service Bay Test for an indication of why the test did not pass, e.g., failed DTC, test aborted, etc. Repair condition as necessary. After repairs, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE  .
    NOTE: Once engine is started, DO NOT turn engine OFF for the remainder of the procedure until test is complete
  5. Ensure that the vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING  . Turn OFF all of the accessories, e.g., A/C, blower fan, etc. 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 0 MPH. Operate engine at idle 2 minutes. Did the EVAP System Status update to YES? If yes, go to step  8 . If no, go to next step.
  6. With 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.
  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  . 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 the DTC. See CONDITIONS FOR RUNNING  . Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat  4 -  6 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, go to DIAGNOSTIC AIDS  .
  8. 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, DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no, system is okay.
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