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Home >> Infiniti >> 2009 >> EX35 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0153 >> DTC P0101, P010B: MAF Sensor >> DTC Logic >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.
      NOTE: If engine will not start or stops soon, wait at least 10 seconds with engine stopped (Ignition switch ON) instead of running engine at idle speed.

      GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
    1. Start engine and warm it up to normal operating temperature.
    2. Run engine for at least 10 seconds at idle speed.
    3. Check 1st trip DTC.

      Is 1st trip DTC detected? 

      YES: Go to "DIAGNOSIS PROCEDURE ".

      NO-1: With CONSULT-III: GO TO 3.

      NO-2: Without CONSULT-III: GO TO  5.

  3. CHECK MASS AIR FLOW SENSOR FUNCTION
    1. Turn ignition switch ON.
    2. Start engine and warm it up to normal operating temperature.

      If engine cannot be started, go to  "DIAGNOSIS PROCEDURE ".

    3. Select "MAS A/F SE-B1/B2" in "DATA MONITOR" mode with CONSULT-III.
    4. Check the voltage of "MAS A/F SE-B1/B2".
    5. Increases engine speed to about 4, 000 RPM.
    6. Monitor the linear voltage rise in response to engine speed increases.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Go to "DIAGNOSIS PROCEDURE ".

      Fig 1: Voltage Graph
      G04874958Courtesy of NISSAN MOTOR CO., U.S.A.
  4. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
    1. Maintain the following conditions for at least 10 consecutive seconds.
      ENGINE SPEED REFERENCE

      ENG SPEED More than 1, 400 RPM
      TP SEN 1-B1 More than 1 V
      TP SEN 2-B1 More than 1 V
      TP SEN 1-B2 More than 1 V
      TP SEN 2-B2 More than 1 V
      Selector lever Suitable position
      Driving location Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.
      CAUTION: Always drive vehicle at a safe speed.
    2. Check 1st trip DTC.

      Is 1st trip DTC detected? 

      YES: Go to "DIAGNOSIS PROCEDURE ".

      NO: INSPECTION END

  5. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

    Perform component function check. Refer to "COMPONENT FUNCTION CHECK ".

    NOTE: Use component function check to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip DTC might not be confirmed.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".

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