Lexus NX: Fuel Level Sensor "A" Circuit Low (P0462,P0463)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (engine Control) / Sfi System / Fuel Level Sensor "A" Circuit Low (P0462,P0463)

DESCRIPTION

Refer to DTC P0461.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0462	Fuel Level Sensor "A" Circuit Low	Fuel sender gauge output resistance is less than 7 Ω for 30 seconds or more (1 trip detection logic).	Open or short in fuel sender gauge circuit Fuel sender gauge assembly Combination meter assembly ECM	Comes on	DTC stored
P0463	Fuel Level Sensor "A" Circuit High	Fuel sender gauge output resistance is higher than 480 Ω 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

MONITOR DESCRIPTION

When the power switch is turned on (IG) and the fuel sender gauge resistance value sent from the combination meter assembly via CAN communication indicates the resistance is less than 7Ω or exceeds 480Ω continuously for 30 seconds, the ECM illuminates the MIL and a DTC is stored.

MONITOR STRATEGY

Related DTCs	P0462: Fuel level sensor range check (Low Resistance) P0463: Fuel level sensor range check (High Resistance)
Required Sensors/Components (Main)	Fuel sender gauge
Required Sensors/Components (Related)	-
Frequency of Operation	Continuous
Duration	30 seconds
MIL Operation	P0462: 1 driving cycles P0463: 2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Auxiliary battery voltage	8 V or higher
Power switch	On (IG)
Time after power switch turned from off to on (IG)	0.5 seconds or more
Vehicle speed	40 km/h (24.86 mph) or higher for 30 seconds or more
Vehicle speed sensor circuit failure (P0500)	Not detected
Lost communication with IPC control module (U0155)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0462

Fuel sender gauge resistance

Less than 7 Ω

P0463

Fuel sender gauge resistance

Higher than 480 Ω

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG).
Turn the Techstream on.
Wait 30 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
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.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0462 or P0463.

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 and no pending DTC is output, perform a universal trip and check for permanent DTCs.
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HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

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 SENDER GAUGE ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the fuel sender gauge assembly connector.

(b) Disconnect the combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
I10-27 (FR) - b2-1 (FS)	Always	Below 1 Ω
I10-28 (FE) - b2-2 (FE)	Always	Below 1 Ω
I10-27 (FR) or b2-1 (FS) - Body ground and other terminals	Always	10 kΩ or higher
I10-28 (FE) or b2-2 (FE) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT FUEL SENDER GAGE ASSEMBLY

(a) Remove the fuel sender gauge assembly.

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(b) Inspect the fuel sender gauge assembly.

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REPLACE COMBINATION METER ASSEMBLY

REPLACE FUEL SENDER GAGE ASSEMBLY

SEE MORE:

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DESCRIPTION This DTC is stored if the parking assist ECU judges as a result of its self check that the vehicle information received via CAN communication and the vehicle information stored in the parking assist ECU do not match. DTC No. Detection Item DTC Detection Condition Trouble Area

Inspection

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Lexus NX: Fuel Level Sensor "A" Circuit Low (P0462,P0463)

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