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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 P0454 >> Circuit/System Testing
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Circuit/System Testing

    IMPORTANT: Refer to the J 41413-200  operation manual for detailed instructions. See Special Tools .
  1. Start the engine with the J 41413-200  connected to the fuel filler neck. See Special Tools .
  2. Allow the engine to idle.
  3. Use the Purge/Seal function to seal the system with a scan tool.
  4. Command the EVAP canister purge solenoid valve to 30 percent.
  5. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool. See Special Tools .
  6. Allow the vacuum to increase on the gage of the J 41413-200  until it reaches approximately 16 inches H2O or until the vacuum reached the abort limit on the scan tool. See Special Tools .
  7. Use the Purge/Seal function to seal the system with a scan tool.
    • If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200  is more than 1 inch H2O replace the FTP sensor. See Special Tools .
    • If the Fuel Tank Pressure Sensor parameter on a scan tool display is less than 3.2 volts, replace the FTP sensor.
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