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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Emission Control Systems (Aux. Emission Control Devices) (H4DO) >> Leak Check Valve Assembly >> Inspection >> Check Pressure Sensor

Check Pressure Sensor

  1. Connect dry-cell battery positive terminal to terminal No. 6 and dry-cell battery ground terminal to terminal No. 8, circuit tester positive terminal to terminal No. 7 and the circuit tester negative terminal to terminal No. 8.
    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 Batteries Connected In Series
      G07664954Courtesy of SUBARU OF AMERICA, INC.
  2. Check the voltage at a normal atmospheric pressure.
    NOTE: The atmospheric pressure at higher altitude is lower than normal. Therefore, the voltage is lower than the standard value.
    Terminal No. Standard
    7 (+) and 8 (-) Approx. 3.5 V (when 25°C (77°F))
  3. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, and check that there is a voltage drop from the voltage measured in step  2) when the vacuum pump is operated. 1.5V 1.5V 1.5V
    Fig 2: Checking Voltage Of Batteries Connected In Series
    G07664955Courtesy of SUBARU OF AMERICA, INC.
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