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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 74 (Engine Control System & Fuel System - 3.6L - DTC P0192 To DTC P0629/P062B) >> DTC P0450 or P0451 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the EVAP purge solenoid valve harness connector.
  2. Engine idling, command the EVAP vent solenoid 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 within -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 within +/-0.9 mmHg (+/-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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