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Home >> Chevrolet >> 2008 >> Impala SS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls And Fuel - 5.3L - DTC P0420 To DTC P3449 >> DTC P0446 >> Circuit/System Testing >> FTP Sensor

FTP Sensor

  1. Ignition ON and fuel cap removed, verify that the FTP sensor parameter is between 1.3-1.7 volts.
    • If the FTP sensor parameter is not within the specified range, test the FTP low reference circuit for an open or high resistance. If the circuit tests normal, replace the FTP sensor.
  2. With the GE-41415-50  , connect the J 41413-200  to the fuel filler neck.
  3. Start the engine.
  4. Allow the engine to idle.
  5. Use the Purge/Seal function to seal the system with a scan tool.
  6. Command the EVAP canister purge solenoid valve to 20 percent.
  7. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool.
  8. Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the value is similar between the scan tool and the vacuum/pressure gage on the J 41413-200  .
    • If the values are not similar, or the voltage is not within the specified range, replace the FTP sensor.
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