FixVault
Home › Nissan-Datsun › 2012 › Quest LE › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U0101 To P0159 › DTC P0102, P0103: MAF Sensor › Diagnosis Procedure

Diagnosis Procedure

  1. INSPECTION START

    Confirm the detected DTC.

    Which DTC is detected? 

    P0102: GO TO 2.

    P0103: GO TO  3.

  2. CHECK INTAKE SYSTEM

    Check the following for connection.

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

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Reconnect the parts.

  3. CHECK MAF SENSOR POWER SUPPLY
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between MAF sensor harness connector and ground.
      MAF sensor Ground Voltage
      Connector Terminal
      F4 5 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. CHECK MAF SENSOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between MAF sensor harness connector and IPDM E/R harness connector.
      MAF sensor IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F4 5 E10 10 Existed

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

  5. CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between MAF sensor harness connector and ECM harness connector.
      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 4 F8 80 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Check the continuity between MAF sensor harness connector and ECM harness connector.
      MAF sensor ECM Continuity
      Connector Terminal Connector Terminal
      F4 3 F8 82 Existed
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK MASS AIR FLOW SENSOR

    Check mass air flow sensor. Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    NO: Replace mass air flow sensor. Refer to "EXPLODED VIEW ".

About FixVault