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Home >> Infiniti >> 2012 >> M37 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 Through P0456 >> DTC P0451: EVAP Control System Pressure Sensor >> Component Inspection
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Component Inspection

  1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 
    1. Turn ignition switch OFF.
    2. Remove EVAP control system pressure sensor with its harness connector.

      Always replace O-ring with a new one. 

    3. Install a vacuum pump to EVAP control system pressure sensor.
    4. Turn ignition switch ON and check output voltage between ECM harness connector terminals under the following conditions.
      ECM Condition [Applied vacuum kPa (kg/cm2 , psi)] Voltage (V)
      Connector + -
      Terminal Terminal
      M107 102 112 Not applied 1.8 - 4.8
      -26.7 (-0.272, -3.87) 2.1 to 2.5 lower than above value
      CAUTION:
      • Always calibrate the vacuum pump gauge when using it.
      • Never apply below -93.3 kPa (-0.952 kg/cm2 , -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm2 , 14.69 psi).

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace EVAP control system pressure sensor. Refer to "EXPLODED VIEW ".

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