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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Controls - 3.9L - DTC P0442 To P2A01) >> DTC P0496 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start the engine.
  2. Seal the EVAP system using the Purge/Seal function with a scan tool.
  3. Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be within -1 to +1 inch H2O.
    • If the Fuel Tank Pressure Sensor parameter is within -1 to +1 inch H2O, the condition is intermittent.
  4. Disconnect the EVAP purge pipe from the EVAP canister purge solenoid valve.
    • If the Fuel Tank Pressure Sensor is between -1 to +1 inch H2O, replace the EVAP canister purge solenoid valve.
  5. If the Fuel Tank Pressure Sensor parameter is NOT between -1 to +1 inch H2O, replace the FTP sensor.
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