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Home >> Audi >> 2014 >> A5 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Emission Control Systems (Aux. Emission Control Devices) (H4DOTC)) >> Fuel Tank Pressure Sensor >> Inspection >> Fuel Tank Pressure Sensor

Fuel Tank Pressure Sensor

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check that the fuel tank pressure sensor has no deformation, cracks or other damages.
  2. Connect dry-cell battery positive terminal to terminal No. 3 and dry-cell battery ground terminal to terminal No. 2, and circuit tester positive terminal to terminal No. 1 and circuit tester negative terminal to terminal No. 2.
    NOTE:
    • Use new dry-cell batteries.
    • Using circuit tester, check the voltage of a single dry-cell battery is 1.6 V or more. And also check the voltage of three batteries in series is between 4.8 V and 5.2 V.
      Fig 1: Checking Voltage Of Single Dry-Cell Battery Using Dry-Cell Batteries
      G07679873Courtesy of SUBARU OF AMERICA, INC.
  3. Connect the Mighty Vac to the pressure port (A) of fuel tank pressure sensor.
    Fig 2: Connecting Mighty Vac To Pressure Port Of Fuel Tank Pressure Sensor
    G07679874Courtesy of SUBARU OF AMERICA, INC.
  4. Check the voltage when generating vacuum and positive pressure using Mighty Vac.
    CAUTION: Do not apply pressure out of the range of -10 - 20 kPa (-0.1 - 0.2 kgf/cm2 , -1.45 - 2.90 psi). Doing so may damage the fuel tank pressure sensor.
    PRESSURE TERMINAL REFERENCE CHART

    Pressure Terminal No. Standard
    -6.666 kPa (-0.07 kgf/cm2 , -0.97 psi) 1 (+) and 2 (-) Approx. 0.5 V (when 25°C (77°F))
    -2.000 kPa (-0.02 kgf/cm2 , -0.29 psi) Approx. 1.9 V (when 25°C (77°F))
    2.000 kPa (0.02 kgf/cm2 , 0.29 psi) Approx. 3.1 V (when 25°C (77°F))
    6.666 kPa (0.07 kgf/cm2 , 0.97 psi) Approx. 4.5 V (when 25°C (77°F))
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