Infiniti Q45. Manual - part 457

DTC P0456 EVAP CONTROL SYSTEM

EC-467

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21. 

CHECK REFUELING EVAP VAPOR LINE

Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and
improper connection. For location, refer to 

EC-38, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)"

 .

OK or NG

OK

>> GO TO 22.

NG

>> Repair or replace hoses and tubes.

22. 

CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, loose-
ness and improper connection.

OK or NG

OK

>> GO TO 23.

NG

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

23. 

CHECK REFUELING CONTROL VALVE

Refer to 

EC-41, "Component Inspection"

 .

OK or NG

OK

>> GO TO 24.

NG

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

24. 

CHECK FUEL LEVEL SENSOR

Refer to 

DI-22, "CHECK FUEL LEVEL SENSOR UNIT"

 .

OK or NG

OK

>> GO TO 25.

NG

>> Replace fuel level sensor unit.

25. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

NBS001Y2

WATER SEPARATOR

1.

Check visually for insect nests in the water separator air inlet.

2.

Check visually for cracks or flaws in the appearance.

3.

Check visually for cracks or flaws in the hose.

4.

Check that A  and C  are not clogged by blowing air into B  with
A , and then C  plugged.

5.

In case of NG in items 2 - 4, replace the parts.

NOTE:

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Do not disassemble water separator.

PBIB1032E

EC-468

DTC P0460 FUEL LEVEL SENSOR

DTC P0460 FUEL LEVEL SENSOR

PFP:25060

Component Description

NBS001Y3

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 combination meter. The combination meter 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.

On Board Diagnosis Logic

NBS001Y4

NOTE:

●

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

EC-156, "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-159, "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

NBS001Y5

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-469, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

PBIB2462E

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.

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

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

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Combination meter

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Fuel level sensor

SEF195Y

DTC P0460 FUEL LEVEL SENSOR

EC-469

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EC

Diagnostic Procedure

NBS001Y6

1. 

CHECK FUEL GAUGE OPERATION

Refer to 

DI-16, "Self-Diagnosis Mode of Combination Meter"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Follow the instruction of 

DI-16, "Self-Diagnosis Mode of Combination Meter"

 .

2. 

CHECK FUEL LEVEL SENSOR AND CIRCUIT

Refer to 

DI-20, "Fuel Level Sensor Signal Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace malfunctioning parts.

3. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Removal and Installation

NBS001Y7

FUEL LEVEL SENSOR

Refer to 

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

 .

EC-470

DTC P0461 FUEL LEVEL SENSOR

DTC P0461 FUEL LEVEL SENSOR

PFP:25060

Component Description

NBS001Y8

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 combination meter. The combination meter 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.

On Board Diagnosis Logic

NBS001Y9

NOTE:

●

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

EC-156, "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-159, "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

NBS001YA

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-8,

"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-80, "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.

6.

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

PBIB2462E

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)

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

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Combination meter

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Fuel level sensor