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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1938 (ENGINE CONTROLS AND FUEL - 3.6L (LCS) - DTC P0192 TO DTC P0629)DTC P0442CIRCUIT/SYSTEM TESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Circuit/System Testing

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
    3. NOTE:
    • You must start with the Circuit/System Verification before proceeding with Circuit/System Testing.
    • Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. The system flow will be less with higher temperatures.
  3. Connect the GE-41415-50  to the fuel tank filler neck. Connect the J 41413-200  to the GE-41415-50  .
  4. Connect the CH-48096  between the EVAP purge solenoid and the EVAP purge pipe. See Special Tools .
  5. Turn the nitrogen/smoke valve on the control panel to SMOKE.
  6. Command the EVAP vent solenoid closed with a scan tool.
  7. Use the remote switch to introduce smoke into the EVAP system.
  8. Use the J 41413-VLV  to open the EVAP service port. Once smoke is observed, remove the J 41413-VLV  .
    9. NOTE: Introduce smoke at 15 second intervals while testing the system.
  9. Verify that smoke is not exiting the entire EVAP system with the J 41413-SPT  . See Special Tools .
      NOTE: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
    • If smoke is observed, repair the condition as necessary.
  10. Remove the J 41413-200  nitrogen supply hose from the GE-41415-50  , and remove the GE-41415-50  from the fuller neck.
  11. Install the fuel fill cap.
  12. Connect the J 41413-200  nitrogen/smoke supply hose to the EVAP service port of the CH-48096  . See Special Tools .
  13. Command the EVAP vent solenoid closed with a scan tool.
  14. Use the remote switch to introduce smoke into the EVAP system.
    15. NOTE: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
  15. Verify that smoke is not exiting the entire EVAP system with the J 41413-SPT  . See Special Tools .
    • If smoke is observed, repair the condition as necessary.
  16. Verify the individual EVAP system components for a leak using the J 41413-300  . The EVAP system components should not leak.
    • If a condition is found replace the affected component.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.