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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Engine Controls - Self-Diagnostics - 3.0L) >> Drive Cycles >> Inspection/Maintenance Evaporative Emission System Set Procedure >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Saturn Vue. 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, go to INSPECTION/MAINTENANCE SYSTEM CHECK .
  2. Select Special Functions using a scan tool. Determine if 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 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 the 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 as necessary. After repairs, go to INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE .
    5. NOTE: 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.
  5. Ensure vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING . Turn OFF all of the accessories, e.g., A/C, blower fan, etc. Once engine is started, DO NOT turn engine OFF for the remainder of the procedure until the test is complete. Start and operate engine at idle for 2 minutes. In order for this test to run, vehicle must operate in the following conditions: Accelerate at part throttle to 45 MPH (72 km/h). Maintain this speed until the engine reaches 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 the engine reaches operating temperature. Decelerate to zero MPH. Operate engine at idle for 2 minutes or until the 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. Observe the DTC Information, with a scan tool, Does the scan tool indicate any failed DTCs? If yes, go toDIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
    7. NOTE: Refer to INSPECTION/MAINTENANCE SYSTEM DTC TABLE  to determine which DTCs are required to run in order to complete this test.
  7. Observe the Not Ran Since Code Cleared display, with a scan tool. Determine which of the DTCs required for a YES status has not run. Enter DTC number in the Specific DTC menu of scan tool. Operate vehicle within the Conditions for Running the DTC for the corresponding DTC. Repeat procedure until scan tool indicates the diagnostic test has run. Repeat this step for any additional required DTCs that have not run. With 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 toDIAGNOSTIC AIDS .
  8. Observe the Emission Related DTC portion of the I/M System Status display, with a scan tool. Does the scan tool indicate any emission related DTCs set? If yes, go toDIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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