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Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 4) >> DTC/Circuit Diagnosis >> DTC P0181: FTT Sensor >> DTC Logic >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. INSPECTION START

    Is it necessary to erase permanent DTC?

    YES 

    GO TO STEP  7.

    NO 

    GO TO STEP 2  .

  2. 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.

    GO TO STEP 3  .

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-I

    1. Turn ignition switch ON and wait at least 10 seconds.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO 

    GO TO STEP 4  .

  4. CHECK ENGINE COOLANT TEMPERATURE

    G-20 With CONSULT

    1. Select "COOLAN TEMP/S" in "DATA MONITOR" with CONSULT.
    2. Check "COOLAN TEMP/S" value.

    NSM020 With GST

    Follow the procedure "With CONSULT" above.

    "COOLAN TEMP/S" less than 60°C (140°F)?

    YES 

    INSPECTION END

    NO 

    GO TO STEP 5  .

  5. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-II

    G-20 With CONSULT

    1. Cool engine down until "COOLAN TEMP/S" is less than 60°C (140°F).
    2. Wait at least 10 seconds.
    3. Check 1st trip DTC.

    NSM020 With GST

    Follow the procedure "With CONSULT" above.

    Is 1st trip DTC detected?

    YES 

    Proceed to DIAGNOSIS PROCEDURE .

    NO 

    GO TO STEP 6  .

  6. PERFORM COMPONENT FUNCTION CHECK (FOR MALFUNCTION B)

    Perform component function check. Refer to COMPONENT FUNCTION CHECK .

    NOTE:

    Use the component function check to check the overall function of the FTT sensor circuit. During this check, a 1st trip DTC might not be confirmed.

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Proceed to DIAGNOSIS PROCEDURE .

  7. 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 STEP 8  .

  8. PERFORM DTC CONFIRMATION PROCEDURE B

    1. Move the vehicle to a cool place.
      NOTE:

      Cool the vehicle in an environment of ambient air temperature between - 10°C (14°F) and 35°C (95°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 

    INSPECTION END

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