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Home >> Infiniti >> 2005 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VQ35DE >> DTC P0101: MAF Sensor >> Diagnostic Procedure

Diagnostic Procedure

  1. INSPECTION START 

    Which malfunction (A or B) is duplicated?

    A or B 

    1. A: GO TO  3 .
    2. B: GO TO 2.
  2. CHECK INTAKE SYSTEM 

    Check the following for connection.

    • Air duct
    • Vacuum hoses
    • Intake air passage between air duct and intake manifold

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Reconnect the parts.
  3. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body. Refer to "GROUND INSPECTION  ".
    Fig 1: Identifying Body Ground Location
    G02360327Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace ground connections.
  4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Mass Air Flow (MAF) Sensor Harness Connector
      G02360328Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between MAF sensor terminal 2 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  6 .
    2. NG: GO TO 5.
    Fig 3: Checking Voltage Between MAF Sensor Terminal 2 And Ground
    G02360329Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E211, M41
    • Harness connectors M82, F102
    • Harness for open or short between IPDM E/R and mass air flow sensor
    • Harness for open or short between mass air flow sensor and ECM
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  6. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67. Refer to WIRING DIAGRAM  .
      1. 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: Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between MAF sensor terminal 4 and ECM terminal 51. Refer to WIRING DIAGRAM  .
      1. Continuity should exist. 
    2. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK INTAKE AIR TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION  ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace intake air temperature sensor.
  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 MASS AIR FLOW SENSOR 

    Refer to "COMPONENT INSPECTION  ".

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Replace mass air flow sensor.
  11. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  ".

    1. : INSPECTION END 
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