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HOMESERVICE MANUALSINFINITI2008EX35 BASE, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - DTCS U1000 TO P0153P0101, P010B MAF SENSORDTC LOGICDTC CONFIRMATION PROCEDURE
2008 Infiniti EX35 Base, AWD

DTC Confirmation Procedure

2008 Infiniti EX35 Base, AWDSECTION DTC Confirmation Procedure
  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

    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.
    Fig 1: Voltage Reference Graph
    G04874958Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Go to "DIAGNOSIS PROCEDURE ".

  4. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
    1. Maintain the following conditions for at least 10 consecutive seconds.
      ENG SPEED SPECIFICATIONS

      ENG SPEED More than 2, 000 rpm
      TP SEN 1-B1 More than 3V
      TP SEN 2-B1 More than 3V
      TP SEN 1-B2 More than 3V
      TP SEN 2-B2 More than 3V
      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 rip 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 ".

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.