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Home >> Infiniti >> 2003 >> G35 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls System - DTCS P0171 Through P0456 - Coupe >> DTC P0452: EVAP Control System Pressure Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 

    Loosen and retighten engine ground screws.

    1. >> GO TO 2.
      Fig 1: Locating Engine Ground Screws
      G03583229Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK CONNECTOR 
    1. Disconnect EVAP control system pressure sensor harness connector.
      Fig 2: Locating EVAP Control System Pressure Sensor
      G03583230Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check sensor harness connector for water.

    Water should not exist  .

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace harness connector.
  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-II or tester.

    Voltage: Approximately 5V 

    OK or NG 

    1. OK: GO TO  5.
    2. NG: GO TO 4.
      Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 And Ground
      G03583231Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B1, M12
    • Harness connectors M72, F102
    • Harness for open or short between EVAP control system pressure sensor and ECM
    1. >> Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B1, M12
    • Harness connectors M72, F102
    • Joint connector-3
    • Harness for open or short between EVAP control system pressure sensor and ECM
    1. >> Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    2. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  9.
    2. NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors B1, M12
    • Harness connectors M72, F102
    • Harness for open or short between EVAP control system pressure sensor and ECM
    1. >> Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace EVAP control system pressure sensor.
  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. >> INSPECTION END 
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