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Home >> Infiniti >> 2019 >> QX50 Essential, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (6 Of 12) >> DTC/Circuit Diagnosis >> DTC P0461: Fuel Level Sensor >> DTC Description >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. CHECK DTC PRIORITY 
    • If DTC P0461 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
    • If DTC P0461 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable.

    NO

    GO TO 2.

  2. PRECONDITIONING 
    WARNING: When performing following procedure, be sure to observe the handling of the fuel. Refer to General Precaution .
    NOTE: Use component function check to check the overall function of the fuel level sensor function. During this check, a 1st trip DTC might not be confirmed.

    TESTING CONDITION:

    Before starting component function check, preparation of draining fuel and refilling fuel is required.

    Do you have CONSULT?

    YES

    GO TO 3.

    NO

    GO TO 4.

  3. PERFORM COMPONENT FUNCTION CHECK-1 

    SYMBOL With CONSULT

    NOTE: Start from step 10, if it is possible to confirm that the fuel cannot be drained by 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal) in advance.
    1. Prepare a fuel container and a spare hose.
    2. Release fuel pressure from fuel line, refer to Work Procedure .
    3. Remove the fuel feed hose on the fuel level sensor unit.
    4. Connect a spare fuel hose where the fuel feed hose was removed.
    5. Turn ignition switch OFF and wait at least 10 seconds then turn ON.
    6. Select "FUEL LEVEL SE" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
    7. Check "FUEL LEVEL SE" output voltage and note it.
    8. Select "FUEL PUMP RLY" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
    9. Touch "ON" and drain fuel approximately 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal) and stop it.
    10. Check "FUEL LEVEL SE" output voltage and note it.
    11. Fill fuel into the fuel tank for 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal).
    12. Check "FUEL LEVEL SE" output voltage and note it.
    13. Confirm whether the voltage changes more than 0.03 V during step 7 to 10 and 10 to 12.

    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 .

  4. PERFORM COMPONENT FUNCTION CHECK-2 

    SYMBOL Without CONSULT

    NOTE: Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal) in advance.
    1. Prepare a fuel container and a spare hose.
    2. Release fuel pressure from fuel line. Refer to Work Procedure .
    3. Remove the fuel feed hose on the fuel level sensor unit.
    4. Connect a spare fuel hose where the fuel feed hose was removed.
    5. Turn ignition switch ON.
    6. Drain fuel by 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment.
    7. Confirm that the fuel gauge indication varies.
    8. Fill fuel into the fuel tank for 30 SYMBOL (7-7/8 US gal, 6-5/8 Imp gal).
    9. Confirm that the fuel gauge indication varies.

    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 .

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