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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1147 (Engine Controls And Fuel - 3.6L - DTC P0137 To DTC P0497) >> DTC P0450 or P0451 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 .
  2. Seal the system using the Purge Seal function with a scan tool.
  3. Pressurize the EVAP system with nitrogen to 5 inches H20. Compare the Fuel Tank Pressure Sensor parameter to the J 41413-200  pressure/vacuum gage. See Special Tools . The FTP sensor should be within 1 inch H20 of the pressure/vacuum gage.
    • If the FTP is not within 1 inch H20 of the pressure/vacuum gage, replace the FTP sensor.
  4. Command the vent solenoid valve OPEN with a scan tool.
    • If the FTP sensor parameter is not 0 inch H20, replace the FTP sensor.
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