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Home >> Infiniti >> 2013 >> EX37 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0456 To P1217 >> DTC P0555: Brake Booster Pressure Sensor >> Component Inspection
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Component Inspection

  1. CHECK BRAKE BOOSTER PRESSURE SENSOR-I 
    1. Turn ignition switch OFF.
    2. Start engine and warm it up to normal operating temperature.
    3. Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
    4. Check the voltage between ECM harness connector terminals as per the following.
      ECM
      Connector + -
      Terminal Terminal
      F101 39 36
      NOTE:
      • To avoid the influence of intake manifold vacuum, check the voltage 1 or more minutes past after engine is stopped.
      • Because the sensor is absolute pressure sensor, output value may differ depends on atmospheric pressure and altitude.
    5. Measure the atmospheric pressure.
      NOTE: As the atmospheric pressure described on the synoptic chart is the value at sea level, compensate the pressure with the following chart.
      Altitude (m) Compensated pressure (hPa)
      0 0
      200 -24
      400 -47
      600 -70
      800 -92
      1000 -114
      1500 -168
      2000 -218
    6. Check the manifold absolute pressure sensor value corresponding to the atmospheric pressure.
      Atmospheric pressure (hPa) Voltage (V)
      800 3.1 - 3.7
      850 3.3 - 3.9
      900 3.5 - 4.1
      950 3.8 - 4.3
      1000 4.0 - 4.6
      1050 4.2 - 4.8
      Fig 1: Manifold Absolute Pressure Sensor Output Voltage Graph
      G08986019Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Replace brake booster pressure sensor. Refer to "REMOVAL AND INSTALLATION ".

  2. CHECK BRAKE BOOSTER PRESSURE SENSOR-II 
    1. Turn ignition switch OFF.
    2. Remove brake booster pressure sensor with its harness connected. Refer to "REMOVAL AND INSTALLATION ".
    3. Connect the hose of vacuum pump (A) to brake booster pressure sensor (1).
    4. Turn ignition switch ON.
      Fig 2: Checking Brake Booster Pressure Sensor-II
      G08986020Courtesy of NISSAN NORTH AMERICA, INC.
    5. Check the voltage between ECM harness connector terminals as per the following.
      ECM
      + -
      Connector Terminal Connector Terminal
      F101 39 F101 36
    6. Check that the difference of the voltage when engine is stopped and that when negative pressure is applied with vacuum pump is within the following limits.
      Vacuum Voltage difference (V)
      -40kPa (-300mmHg) 1.5 - 2.0
      -53.3kPa (-400mmHg) 2.0 - 2.6
      -66.7kPa (-500mmHg) 2.6 - 3.2
      -80kPa (-600mmHg) 3.2 - 3.8

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace brake booster pressure sensor. Refer to "REMOVAL AND INSTALLATION ".

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