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Home >> Infiniti >> 2019 >> Q60 Pure, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (3 Of 13) >> DTC/Circuit Diagnosis >> DTC P0111: IAT Sensor >> DTC Description >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. INSPECTION START 

    Is it necessary to erase permanent DTC?

    YES

    GO TO  3.

    NO

    GO TO 2.

  2. PERFORM COMPONENT FUNCTION CHECK 
    NOTE: Use the component function check to check the overall function of the IAT sensor circuit. During this check, a 1st trip DTC might not be confirmed.
    1. Turn ignition switch OFF.
    2. Disconnect mass air flow sensor (bank 1) harness connector.
    3. Check resistance between mass air flow sensor (bank 1) terminals as follows.

      Terminals

      Condition

      Resistance (kOhm)

      3 and 4

      Temperature [ deg.C (deg.F)]

      25 (77)

      1.800 - 2.200

    Is the inspection result normal?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    Proceed to Diagnosis Procedure .

  3. 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.

    TESTING CONDITION:

    • Before performing the following procedure, do not add fuel.
    • Before performing the following procedure, check that fuel level is between 1/4 and 4/4.
    • Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

    GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Move the vehicle to a cool place.
      NOTE: Cool the vehicle in an environment of ambient air temperature between -10 deg.C (14 deg.F) and 35 deg.C (95 deg.F).
    2. Turn ignition switch OFF and leave the vehicle for 12 hours.
      CAUTION: Never turn ignition switch ON during this procedure.
      NOTE: The vehicle must be cooled with the hood open.
    3. Start engine and let it idle for 5 minutes or more.
      CAUTION: Never turn ignition switch OFF during idling.
    4. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    NO

    Confirmation after repair: INSPECTION END

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