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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0442 To DTC P2101 >> DTC P0446 >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts.
    • If not within the specified range, go to the 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 the fuel tank vacuum is greater than the specified range, go toRestriction  section in Circuit/System Testing.
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