Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Fuel Level Sensor "A" Circuit Short to Battery (P046012,P046014)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Fuel Level Sensor "A" Circuit Short to Battery (P046012,P046014)

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 voltage value and outputs it to the combination meter assembly. 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

Note

P046012

Fuel Level Sensor "A" Circuit Short to Battery

Fuel sender gauge output voltage is higher than 4.73 V for 30 seconds or more (2 trip detection logic).
  • Open or short in fuel sender gauge circuit
  • Fuel sender gauge assembly
  • Combination meter assembly
  • ECM

Comes on

DTC stored

SAE Code: P0463

P046014

Fuel Level Sensor "A" Circuit Short to Ground or Open

Fuel sender gauge output voltage is less than 0.25 V for 30 seconds or more (2 trip detection logic).
  • Open or short in fuel sender gauge circuit
  • Fuel sender gauge assembly
  • Combination meter assembly
  • ECM

Comes on

DTC stored

SAE Code: P0462

MONITOR DESCRIPTION

The combination meter assembly sends fuel level sensor signals to the ECM via CAN communication. When the engine switch is on (IG), if the output voltage of the fuel level sensor is less than 0.25 V or higher than 4.73 V for 30 seconds or more, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs

P0462: Fuel level sensor range check (low voltage)

P0463: Fuel level sensor range check (high voltage)

Required Sensors/Components (Main)

Fuel level sensor

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

30 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All of the following conditions are met

-

Battery voltage

8 V or higher

Engine switch

On (IG)

Lost communication with instrument panel cluster control module (U0155)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0462

Fuel level sensor voltage

Less than 0.25 V
P0463

Fuel level sensor voltage

Higher than 4.73 V

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine 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 engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Wait 30 seconds or more [B].
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P046012 or P046014.
  13. 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

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • [A] to [C]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

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.

CHECK HARNESS AND CONNECTOR (FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the fuel suction tube with pump and gauge assembly connector.

(b) Disconnect the combination meter assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S10-1 (FV) - J10-18 (FV)

Always

Below 1 Ω

S10-3 (S) - J10-27 (FR)

Always

Below 1 Ω

S10-2 (FE) - J10-28 (FE)

Always

Below 1 Ω

S10-1 (FV) or J10-18 (FV) - Body ground and other terminals

Always

10 kΩ or higher

S10-3 (S) or J10-27 (FR) - Body ground and other terminals

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

INSPECT FUEL SENDER GAUGE ASSEMBLY

(a) Remove the fuel sender gauge assembly.

Click here

(b) Inspect the fuel sender gauge assembly.

Click here

NG

REPLACE FUEL SENDER GAUGE ASSEMBLY

OK

3.

INSPECT FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY

*a

Component without harness connected

(Fuel Suction Tube with Pump and Gauge Assembly)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

S10-1 (FV) - A-3

Always

Below 1 Ω

S10-2 (FE) - A-2

Always

Below 1 Ω

S10-3 (S) - A-1

Always

Below 1 Ω

S10-1 (FV) - S10-3 (S)

or

A-3 - A-1

Always

10 kΩ or higher

S10-1 (FV) - S10-2 (FE)

or

A-3 - A-2

Always

10 kΩ or higher

S10-2 (FE) - S10-3 (S)

or

A-2 - A-1

Always

10 kΩ or higher
OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE FUEL SUCTION TUBE WITH PUMP AND GAUGE ASSEMBLY
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