Infiniti M45 (Y34). Manual - part 425

DTC P0460 FUEL LEVEL SENSOR

EC-389

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

ABS002LE

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten two ground screws.
Refer to

EC-141, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK FUEL LEVEL SENSOR POWER SUPPLY CIRCUIT

Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.

Turn ignition switch ON.

Check voltage between “fuel level sensor unit and fuel pump”
terminal 5 and ground with CONSULT-II or a tester.

OK or NG

>> GO TO 4.

>> GO TO 3.

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

107

Fuel level sensor ground

[Engine is running]

●

Idle speed

Approximately 0V

119

R/L

Fuel level sensor

[Ignition switch: ON]

Approximately 0 - 4.8V
Output voltage varies with fuel
level.

PBIB1118E

PBIB1127E

Voltage: Battery

voltage

PBIB0134E

EC-390

DTC P0460 FUEL LEVEL SENSOR

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M141, B211

●

Harness connectors B61, B261

●

Joint connector-15

●

Harness for open or short between combination meter and “fuel level sensor unit and fuel pump”

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect combination meter harness connectors.

Check harness continuity between “fuel level sensor unit and fuel pump” terminal 6 and combination
meter terminal 31. Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 6.

>> GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M141, B211

●

Harness connectors B61, B261

●

Joint connector-15

●

Harness for open or short between combination meter and “fuel level sensor unit and fuel pump”

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK FUEL LEVEL SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Disconnect ECM harness connector.

Check harness continuity between the following;
ECM terminal 119 and “fuel level sensor unit and fuel pump” terminal 5,
ECM terminal 107 and “fuel level sensor unit and fuel pump” terminal 6.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 8.

>> GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

Joint connector-15

●

Harness for open or short between ECM and “fuel level sensor and fuel pump”

>> Repair open circuit or short to ground or short to power in harness or connectors.

Continuity should exist.

DTC P0460 FUEL LEVEL SENSOR

EC-391

CHECK FUEL LEVEL SENSOR

Refer to

FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

OK or NG

>> GO TO 9.

>> Replace fuel level sensor unit.

CHECK INTERMITTENT INCIDENT

Refer to

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END

Removal and Installation

ABS002LF

FUEL LEVEL SENSOR

Refer to

FL-3, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

EC-392

DTC P0461 FUEL LEVEL SENSOR

PFP:25060

Component Description

ABS002LG

The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the ECM.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.

On Board Diagnosis Logic

ABS002LH

Driving long distances naturally affect fuel gauge level.
This diagnosis detects the fuel gauge malfunction of the gauge not moving even after a long distance has
been driven.

Overall Function Check

ABS002LI

Use this procedure to check the overall function of the fuel level sensor function. During this check, a 1st trip
DTC might not be confirmed.

WARNING:

When performing following procedure, be sure to observe the handling of the fuel. Refer to

FL-9,

"FUEL TANK"

TESTING CONDITION:
Before starting overall function check, preparation of draining fuel and refilling fuel is required.

WITH CONSULT-II

NOTE:
Start from step 10, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/
8 Imp gal) in advance.
1.

Prepare a fuel container and a spare hose.

Release fuel pressure from fuel line, refer to

EC-46, "FUEL PRESSURE RELEASE"

Remove the fuel feed hose on the fuel level sensor unit.

Connect a spare fuel hose where the fuel feed hose was removed.

Turn ignition switch OFF and wait at least 10 seconds then turn ON.

Select “FUEL LEVEL SE” in “DATA MONITOR” mode with CONSULT-II.

Check “FUEL LEVEL SE” output voltage and note it.

Select “FUEL PUMP” in “ACTIVE TEST” mode with CONSULT-
II.

Touch “ON” and drain fuel approximately 30 (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 (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 0.03V during

step 7 to 10 and 10 to 12.
If NG, check the fuel level sensor, refer to

DI-19, "CHECK FUEL

LEVEL SENSOR UNIT"

PBIB1241E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0461
0461

Fuel level sensor circuit
range/performance

The output signal of the fuel level sensor does not
change within the specified range even though
the vehicle has been driven a long distance.

●

Harness or connectors
(The sensor circuit is open or shorted)

●

Fuel level sensor

SEF195Y

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