Infiniti G37 Coupe. Manual - part 537

P0456 EVAP CONTROL SYSTEM

EC-329

< COMPONENT DIAGNOSIS >

[VQ37VHR]

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Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or reconnect the hose.

13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-291, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace EVAP canister purge volume control solenoid valve.

14.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-242, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace fuel level sensor unit.

15.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-306, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Replace EVAP control system pressure sensor.

16.

CHECK EVAP PURGE LINE

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

EC-80, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Repair or reconnect the hose.

17.

CLEAN EVAP PURGE LINE

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

>> GO TO 18.

18.

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-504, "Description"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Repair or replace hoses and tubes.

19.

CHECK RECIRCULATION LINE

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

Is the inspection result normal?

YES

>> GO TO 20.

NO

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

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-507, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 21.

NO

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

21.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-55, "Component Inspection"

.

Is the inspection result normal?

EC-330

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0456 EVAP CONTROL SYSTEM

YES

>> GO TO 22.

NO

>> Replace fuel level sensor unit.

22.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001910878

1.

CHECK FUEL TANL VACUUM RELIEF VALVE

1.

Turn ignition switch OFF.

2.

Remove fuel filler cap.

3.

Wipe clean valve housing.

4.

Check valve opening pressure and vacuum.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

REPLACE FUEL FILLER CAP

Replace fuel filler cap.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
come on.

>> INSPECTION END

SEF445Y

Pressure:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

2

, 2.22 - 

2.90 psi)

Vacuum:

−

6.0 to 

−

3.3 kPa (

−

0.061 to 

−

0.034 kg/cm

2

, 

−

0.87 to 

−

0.48 psi)

SEF943S

P0460 FUEL LEVEL SENSOR

EC-331

< COMPONENT DIAGNOSIS >

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P0460 FUEL LEVEL SENSOR

Description

INFOID:0000000001734143

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 variable resistor. Fuel level sensor output volt-
age changes depending on the movement of the fuel mechanical float.

DTC Logic

INFOID:0000000001734144

DTC DETECTION LOGIC

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

U1000, U1001.Refer to 

EC-146, "DTC Logic"

.

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

to 

EC-147, "DTC Logic"

.

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

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test. 
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and wait maximum of 2 consecutive minutes.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-331, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001734145

1.

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

Refer to 

MWI-37, "CONSULT-III Function (METER/M&A)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

MWI-54, "Component Function Check"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0460

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

EC-332

< COMPONENT DIAGNOSIS >

[VQ37VHR]

P0460 FUEL LEVEL SENSOR

>> INSPECTION END