Lexus NX manuals

Lexus NX: Fuel Level Sensor "A" Circuit Range / Performance (P0461)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Fuel Level Sensor "A" Circuit Range / Performance (P0461)

DESCRIPTION

The fuel sender gauge is located inside the fuel tank and measures the amount of fuel. The fuel sender gauge converts the fuel level in the fuel tank into a output value, and outputs this value. The ECM determines when it is necessary to refuel the vehicle based on changes in the output value of the fuel sender gauge.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0461

Fuel Level Sensor "A" Circuit Range / Performance

Despite consuming a certain amount of fuel, the change in the output value of the fuel sender gauge is below the threshold. (1 trip detection logic).
  • Fuel sender gauge assembly
  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

When the fuel sender gauge assembly output value changes less than a specified amount, when compared to the fuel consumption calculated from the fuel injection volume, the ECM will detect a malfunction, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0461: Fuel level sensor stuck

Required Sensors/Components (Main)

Fuel sender gauge

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

Less than 10 seconds

MIL Operation

1 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Lost communication with instrument panel cluster control module (U0155)

Not detected

Fuel level sensor circuit malfunction (P0462, P0463)

Not detected

Either of the following conditions is met

Condition A or B

A. Auxiliary battery voltage

8.0 V or higher

B. Check mode

On

Fuel level sensor output via CAN

Received

Power switch

On (IG)

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met

A, B or C

A. Accumulated volume of injected fuel during (a) is met at high fuel level

19.7 L or more

B. Accumulated volume of injected fuel during (a) is met at middle fuel level

5.6 L or more

C. Accumulated volume of injected fuel during (a) is met at low fuel level

32.1 L or more

(a) Smoothed fuel level sensor output (Maximum - Minimum)

Less than 2.8 L

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG) [A].
  7. Turn the Techstream on.
  8. Start the engine [B].
  9. Drive the vehicle at 80 km/h (50 mph) or more for 30 minutes [C].
  10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
  11. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  13. Input the DTC: P0461.
  14. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result is INCOMPLETE or N/A, perform steps [E] through [F].
  15. Drive the vehicle at 80 km/h (50 mph) or more for 30 minutes [E].
  16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].
  17. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  19. Input the DTC: P0461.
  20. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
  21. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

INTERVIEW THE CUSTOMER

(a) Interview the customer for details about when the they refuel the vehicle.

HINT:

When the fuel tank is full, if the vehicle is repeatedly driven a short distance and then refueled, the fuel sender gauge output value will not change. In this case, the ECM may judge that the fuel sender gauge is stuck and store DTC P0461. If the vehicle was driven in this manner, as the DTC was stored due to a user action, clear the DTCs without performing troubleshooting and return the vehicle to the customer.

NEXT

2.

INSPECT FUEL SENDER GAUGE ASSEMBLY

(a) Remove the fuel sender gauge assembly.

Click here

(b) Inspect the fuel sender gauge assembly.

Click here

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

REPLACE FUEL SENDER GAUGE ASSEMBLY

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 On-vehicle Inspection

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