Infiniti FX35 / FX45. Manual - part 556

DTC P0456 EVAP CONTROL SYSTEM

EC-985

< SERVICE INFORMATION >

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Refer to 

EC-965, "Component Inspection"

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OK or NG

OK

>> GO TO 18.

NG

>> Replace EVAP control system pressure sensor.

18.

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to 

EC-618, "Description"

.

OK or NG

OK

>> GO TO 19.

NG

>> Repair or reconnect the hose.

19.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 20.

20.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-
nection. For location, refer to 

EC-624

.

OK or NG

OK

>> GO TO 21.

NG

>> Repair or replace hoses and tubes.

21.

CHECK RECIRCULATION LINE

Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.
OK or NG

OK

>> GO TO 22.

NG

>> Repair or replace hose, tube or filler neck tube.

22.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-626, "Component Inspection"

.

OK or NG

OK

>> GO TO 23.

NG

>> Replace refueling EVAP vapor cut valve with fuel tank. 

23.

CHECK FUEL LEVEL SENSOR

Refer to 

DI-21, "Electrical Component Inspection"

.

OK or NG

OK

>> GO TO 24.

NG

>> Replace fuel level sensor unit.

24.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

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>> INSPECTION END

EC-986

< SERVICE INFORMATION >

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DTC P0460 FUEL LEVEL SENSOR

DTC P0460 FUEL LEVEL SENSOR

Component Description

INFOID:0000000001326823

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 commu-
nication 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.

On Board Diagnosis Logic

INFOID:0000000001326824

NOTE:
• If DTC P0460 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-724

.

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

to 

EC-726

.

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

INFOID:0000000001326825

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.

1.

Start engine and wait maximum of 2 consecutive minutes.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-986, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001326826

1.

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

Refer to 

DI-27, "CONSULT-III Function (METER/M&A)"

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

DI-19, "Fuel Level Sensor Signal Inspection"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

PBIB1508E

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 be-
ing 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

DTC P0460 FUEL LEVEL SENSOR

EC-987

< SERVICE INFORMATION >

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Removal and Installation

INFOID:0000000001326827

FUEL LEVEL SENSOR

Refer to

FL-4

EC-988

< SERVICE INFORMATION >

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DTC P0461 FUEL LEVEL SENSOR

DTC P0461 FUEL LEVEL SENSOR

Component Description

INFOID:0000000001326828

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 commu-
nication 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.

On Board Diagnosis Logic

INFOID:0000000001326829

NOTE:
• If DTC P0461 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-724

.

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

to 

EC-726

.

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

INFOID:0000000001326830

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

.

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

 WITH CONSULT-III

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-665, "Fuel Pressure Check"

.

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.

6.

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

7.

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

8.

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

9.

Touch “ON” and drain fuel approximately 30   (7-7/8 US gal, 6-5/8 Imp gal) and stop it.

PBIB1508E

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