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Home >> Chevrolet >> 2002 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Evaporative Emission System Set Procedure >> Procedure
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Inspection/Maintenance Evaporative Emission System Set Procedure: Procedure

  1. Perform INSPECTION/MAINTENANCE SYSTEM CHECK . After performing inspection/maintenance system check, go to next step.
  2. Using scan tool, select SPECIAL FUNCTIONS. Determine if vehicle is equipped with a Service Bay Test for EVAP system. If vehicle is equipped with EVAP Service Bay Test, go to next step. If vehicle is not equipped with EVAP Service Bay Test, go to step  5.
  3. Ensure vehicle is operating within Conditions for Running. Turn off all accessories. Following directions on scan tool, perform EVAP Service Bay Test. If EVAP system passed Service Bay Test, go to step  8. If EVAP system did not pass Service Bay Test, go to next step.
  4. Observe scan tool Service Bay Test for an indication of why test did not pass (e.g., failed DTC, test aborted, etc.). Diagnose and repair condition as necessary. After repairs, see INSPECTION/MAINTENANCE COMPLETE SYSTEM SET PROCEDURE .
    5. CAUTION: Road test 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 operating within Conditions for Running. Turn off all of accessories. Once engine is started, DO NOT turn engine off for remainder of procedure until test is complete. Start and idle engine. Operate vehicle in following manner:
    • Accelerate at part throttle to 45 MPH. Maintain speed until engine reaches operating temperature (8-10 minutes).
    • Continue operating conditions for an additional 3 minutes after engine reaches operating temperature, or until I/M SYSTEM STATUS indicator updates to YES.

    If EVAP SYSTEM STATUS updates to YES, go to step  8. If EVAP SYSTEM STATUS does not update to YES, go to next step.

  6. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, see DIAGNOSTIC TROUBLE CODE INDEX  table under DIAGNOSTIC TROUBLE CODE DEFINITIONS. If scan tool does not indicate any failed DTCs, go to next step.
  7. Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine if DTCs P0440, P0442, P0446 and P1441 have run. For those DTCs that have not run, see Conditions for Running DTC in appropriate DTC under DIAGNOSTIC TESTS. Operate vehicle to meet code enable criteria until DTC(s) runs. Using scan tool, observe I/M SYSTEM STATUS display. If EVAP SYSTEM STATUS updated to YES, go to next step. If EVAP SYSTEM STATUS did not update to YES, see DIAGNOSTIC AIDS .
  8. Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, see DIAGNOSTIC TROUBLE CODE INDEX  table under DIAGNOSTIC TROUBLE CODE DEFINITIONS.
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