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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0440: Evaporative Emission System >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Inspect the EVAP system for the following conditions:
    • A loose, missing, or damaged service port Schrader valve.
    • A loose, incorrect, missing, or damaged fuel fill cap.
    • A damaged EVAP purge solenoid.
    Raise the vehicle on a hoist. Inspect the EVAP system for the following conditions:
    • Any disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses.
    • A damaged EVAP vent solenoid or EVAP canister.

    Did you find and correct the condition? If yes, go to step  34. If no, go to next step.

  3. Using a scan tool, clear the DTCs. Command the EVAP purge solenoid to 50 percent and back to zero percent using a scan tool. Do you hear or feel a clicking from the EVAP purge solenoid when it is commanded to 50 percent? If yes, go to next step. If no, go to step  5.
  4. Command the EVAP vent solenoid ON and OFF using the scan tool. Do you hear or feel a click as the EVAP vent solenoid is commanded ON and OFF? If yes, go to step  9. If no, go to step  7.
  5. Disconnect the EVAP purge solenoid harness connector. Turn ignition switch to RUN position, engine OFF. Connect a test light between the ignition 1 voltage circuit of the EVAP purge solenoid and a known good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  25.
  6. Connect a test light between the ignition 1 voltage circuit of the EVAP purge solenoid and the control circuit of the EVAP purge solenoid. Command the EVAP purge solenoid to 50 percent and then to zero percent using a scan tool. Does the test light illuminate or pulsate when the EVAP purge solenoid is commanded to 50 percent and turn OFF when the EVAP purge solenoid is commanded to zero percent? If yes, go to step  20. If no, go to step  18.
  7. Turn ignition switch to RUN position, engine OFF. Disconnect the EVAP vent solenoid harness connector. Connect a test light between the ignition 1 voltage circuit of the EVAP vent solenoid and a known good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  26.
  8. Connect a test light between the ignition 1 voltage circuit of the EVAP vent solenoid and the control circuit of the EVAP vent solenoid. Command the EVAP vent solenoid ON, using a scan tool. Does the test light illuminate? If yes, go to step  21. If no, go to step  19.
    9. NOTE: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. System flow will be less with higher temperatures.
  9. Turn ignition switch to OFF position. Connect the Evaporative Emissions System Tester (EEST) (J 41413-200), or equivalent, power supply clips to a known good 12-volt source. Install the Fuel Tank Cap Adapter (J 41415-40), or equivalent, to the fuel fill pipe. Connect the fuel fill cap to the fuel tank cap adaptor. Connect the EEST nitrogen/smoke supply hose to the fuel tank cap adaptor. Turn ignition switch to RUN position, engine OFF. Command the EVAP vent solenoid closed using a scan tool. Turn the nitrogen/smoke valve on the EEST control panel to SMOKE. Use the remote switch to introduce smoke into the EVAP system. Use the EVAP Service Port Vent Fitting (J 41413-VLV), or equivalent, to open the EVAP service port. Remove the J 41413-VLV once smoke is observed. Continue to introduce smoke into the EVAP system for an additional 60 seconds. Inspect the entire EVAP system for exiting smoke using the High Intensity White Light (J 41413-SPT), or equivalent. Continue to introduce smoke at 15 second intervals until the leak source has been located. Did you locate and repair a leak source? If yes, go to step  34. If no, go to next step.
  10. Disconnect the fuel tank cap adaptor from the fuel fill pipe. Install the fuel fill cap to the fuel fill pipe. Connect the EEST nitrogen/smoke supply hose to the EVAP service port. Use the remote switch to introduce smoke into the EVAP system. Inspect the entire EVAP system for exiting smoke using the high intensity White light. Continue to introduce smoke at 15 second intervals until the leak source has been located. Did you locate and repair a leak source? If yes, go to step  34. If no, go to next step.
  11. Use the remote switch to stop introducing smoke. Install the fuel tank cap adaptor to the fuel fill pipe. Connect the EEST nitrogen/smoke supply hose to the fuel tank cap adaptor. Connect the vehicle fuel fill cap to the fuel tank cap adaptor. Command the EVAP vent solenoid open using a scan tool. Compare the Fuel Tank Pressure (FTP) sensor parameter using a scan tool, to the EEST pressure/vacuum gauge. Is the scan tool FTP sensor parameter within 1 in. H2O of the EEST pressure/vacuum gauge? If yes, go to next step. If no, go to step  22.
  12. Seal the EVAP system using the EVAP Purge/Seal function using a scan tool. Turn the nitrogen/smoke valve on the EEST control panel to NITROGEN. Use the EEST to pressurize the EVAP system to 10 in. H2O. Is the FTP sensor parameter more than 5 in. H2O? If yes, go to next step. If no, go to step  22.
  13. Use the remote switch to stop introducing nitrogen into the EVAP system. Increase the EVAP purge solenoid to 100 percent. Is the FTP sensor parameter Less than 1 in. H2O? If yes, go to step DIAGNOSTIC AIDS . If no, go to next step.
  14. Disconnect the EVAP purge vacuum source from the EVAP purge solenoid. Is the FTP sensor parameter less than 1 in. H2O? If yes, go to step  24. If no, go to next step.
  15. Disconnect the EVAP purge pipe from the EVAP purge solenoid. Is the FTP sensor parameter less than 1 in. H2O? If yes, go to step  29. If no, go to step  17.
  16. Disconnect the EVAP purge pipe at the EVAP canister. Is the FTP sensor parameter less than 1 in. H2O? If yes, go to  27. If no, go to next step.
  17. Disconnect the EVAP vapor pipe at the EVAP canister. Is the FTP sensor parameter less than 1 in. H2O? If yes, go to step  31. If no, go to step  29.
  18. Check the control circuit of the EVAP purge solenoid for an open or for a short to voltage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  23.
  19. Check the control circuit of the EVAP vent solenoid for an open or for a short to voltage. Did you find and correct the condition? If yes, go to step  34. If no, go to step  23.
  20. Check for an intermittent and for a poor connection at the EVAP canister purge solenoid. Did you find and correct the condition? If yes, go to step  34. If no, go to step  29.
  21. Check for an intermittent and for a poor connection at the EVAP vent solenoid. Did you find and correct the condition? If yes, go to step  34. If no, go to step  30.
  22. Check for an intermittent and for a poor connection at the FTP sensor. Did you find and correct the condition? If yes, go to step  34. If no, go to step  32.
  23. Check for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  34. If no, go to step  33.
  24. Repair the pinched or obstructed EVAP purge solenoid vacuum source. After repair, go to step  34.
  25. Repair the open or short to ground in the ignition 1 voltage circuit of the EVAP purge solenoid. Replace the fuse as necessary. After repair, go to step  34.
  26. Repair the open or short to ground in the ignition 1 voltage circuit of the EVAP vent solenoid. Replace the fuse as necessary. After repair, go to step  34.
  27. Repair restriction in the EVAP purge pipe. After repair, go to step  34.
  28. Repair the restriction in the EVAP vapor pipe. After repairs, go to step  34.
  29. Replace EVAP purge solenoid. After repairs, go to step  34.
  30. Replace the EVAP vent solenoid. After repairs, go to step  34.
  31. Replace EVAP canister. After repairs, go to step  34.
  32. Replace FTP sensor. After repairs, go to step  34.
  33. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
    34. NOTE: Do not exceed the specified value in this step. Exceeding the specified value may produce incorrect test results.
  34. Connect the EEST to the fuel fill pipe. Turn the nitrogen/smoke valve to NITROGEN. Seal the EVAP system using the EVAP purge/seal function using a scan tool. Pressurize the EVAP system to the specified value. Observe the EEST pressure/vacuum gauge for 5 minutes. Does the EEST pressure/vacuum gauge remain constant? If yes, go to next step. If no, go to step  2.
  35. Using a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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