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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Emission Control Systems (Aux. Emission Control Devices) (H4DO)) >> Leak Check Valve Assembly >> Check Vacuum Pump >> Check Pressure Sensor

Check Pressure Sensor

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  1. Connect dry-cell battery positive terminal to terminal No. 6 and dry-cell battery ground terminal to terminal No. 8, circuit tester positive side to terminal No. 7 and the circuit tester ground side to terminal No. 8.
    NOTE:
    • Use new dry-cell batteries.
    • Using a circuit tester, check that the initial voltage of each dry-cell battery is 1.6 V or more. And also check that the voltage of three batteries in series is between 4.8 - 5.2 V.
    • For power supply, 5 V DC constant voltage power source can also be used.
    Fig 1: Connecting Dry-Cell Battery Positive Terminal To Terminal 6 And Dry-Cell Battery Ground Terminal To Terminal 8
    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.
Fig 2: Connecting Battery Positive Terminal To Terminal 3 And Battery Ground Terminal To Terminal 4
G07664955Courtesy of SUBARU OF AMERICA, INC.
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