Infiniti M35/M45 Y50. Manual - part 497

DTC P0456 EVAP CONTROL SYSTEM

EC-461

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23. 

CHECK FUEL LEVEL SENSOR

Refer to 

DI-26, "CHECK FUEL LEVEL SENSOR UNIT"

 .

OK or NG

OK

>> GO TO 24.

NG

>> Replace fuel level sensor unit.

24. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

EC-462

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DTC P0460 FUEL LEVEL SENSOR

DTC P0460 FUEL LEVEL SENSOR

PFP:25060

Component Description

NBS00519

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 “unified meter and A/C amp.”. The “unified meter and A/C
amp.” sends the fuel level sensor signal to the ECM through CAN
communication line.
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.

●

Fuel level sensor unit and fuel pump (1)

●

Fuel pressure regulator (2)

●

Fuel tank temperature sensor (3)

On Board Diagnosis Logic

NBS0051A

NOTE:

●

If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to 

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

●

If DTC P0460 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-164, "DTC U1010 CAN COMMUNICATION"

 .

When the vehicle is parked, naturally the fuel level in the fuel tank is stable. It means that output signal of the
fuel level sensor does not change. If ECM senses sloshing signal from the sensor, fuel level sensor malfunc-
tion is detected.

DTC Confirmation Procedure

NBS0051B

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait maximum of 2 consecutive minutes.

4.

If 1st trip DTC is detected, go to 

EC-463, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB2707E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0460
0460

Fuel level sensor circuit 
noise

Even though the vehicle is parked, a signal 
being varied is sent from the fuel level sensor 
to ECM.

●

Harness or connectors
(The CAN communication line is open or 
shorted)

●

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

●

Unified meter and A/C amp.

●

Fuel level sensor

SEF195Y

DTC P0460 FUEL LEVEL SENSOR

EC-463

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Diagnostic Procedure

NBS0051C

1. 

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-31, "SELF-DIAG RESULTS"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

DI-22, "Fuel Level Sensor Signal Inspection"

 .

2. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-153, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Removal and Installation

NBS0051D

FUEL LEVEL SENSOR

Refer to

FL-4, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

EC-464

[VQ35DE]

DTC P0461 FUEL LEVEL SENSOR

DTC P0461 FUEL LEVEL SENSOR

PFP:25060

Component Description

NBS0051E

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 “unified meter and A/C amp.”. The “unified meter and A/C
amp.” sends the fuel level sensor signal to the ECM through CAN
communication line.
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.

●

Fuel level sensor unit and fuel pump (1)

●

Fuel pressure regulator (2)

●

Fuel tank temperature sensor (3)

On Board Diagnosis Logic

NBS0051F

NOTE:

●

If DTC P0461 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to 

EC-161, "DTC U1000, U1001 CAN COMMUNICATION LINE"

 .

●

If DTC P0461 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to 

EC-164, "DTC U1010 CAN COMMUNICATION"

 .

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

NBS0051G

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-10,

"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.

2.

Release fuel pressure from fuel line, refer to 

EC-88, "FUEL PRESSURE RELEASE"

 .

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.

PBIB2707E

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 dis-
tance.

●

Harness or connectors
(The CAN communication line is open or 
shorted)

●

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

●

Unified meter and A/C amp.

●

Fuel level sensor