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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.4L - DTC P0401 To DTC P2544) >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON and fuel cap removed, verify the FTP sensor parameter is between 1.3-1.7 volts.
  2. Install the fuel cap.
  3. 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.