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Home >> Chevrolet >> 2007 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0420 To DTC P3433 >> DTC P0446 >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON and fuel cap removed, verify the FTP sensor parameter is between 1.3-1.7 volts.
    • If greater than the specified range, refer to the FTP Sensor FTP sensor section in Circuit/System Testing.
  2. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 8 inches H2O.
    • If greater than the specified range, refer to the restriction  section in Circuit/System Testing.
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