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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L - DTC P0192 To DTC P0629 >> DTC P0450 or P0451 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the EVAP purge solenoid valve harness connector.
  2. Engine idling, command the EVAP vent valve closed with a scan tool.
  3. Increase the engine speed to 1, 200-1, 500 RPM. Verify the scan tool fuel tank pressure (FTP) sensor parameter is -0.9 to +0.9 mmHg (-0.5 to +0.5 in.H2O).
    • If not within the specified range, replace the EVAP purge solenoid valve.
  4. Ignition OFF, remove the fuel fill cap. Connect the GE-41415-50  to the fuel tank filler neck. Connect the J 41413-200  to the GE-41415-50  . See Special Tools .
  5. Ignition ON, command the EVAP vent solenoid valve closed with a scan tool.
  6. Pressurize the EVAP system with nitrogen to 9.33 mm/Hg (5 in/H2O). Compare the scan tool Fuel Tank Pressure Sensor parameter to the J 41413-200  pressure/vacuum gage. See Special Tools . Verify the FTP sensor parameter is within +/-0.9 mmHg (+/-0.5 in.H2O) of the pressure/vacuum gage.
    • If not within the specified range, replace the FTP sensor.
  7. Command the EVAP vent solenoid valve OPEN with a scan tool. Verify the scan tool FTP sensor parameter is -0.9 to +0.9 mmHg (-0.5 to +0.5 in.H2O).
    • If not within the specified range, test or replace the EVAP canister vent solenoid valve and vent pipe for a blockage or restriction.
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