Nissan Xterra. Manual - part 304

EC-342

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P0456 EVAP CONTROL SYSTEM

NG

>> Repair or reconnect the hose.

15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-306, "Component Inspection"

.

OK or NG

OK

>> GO TO 16.

NG

>> Replace EVAP canister purge volume control solenoid valve. Refer to 

EM-25, "Exploded View"

.

16.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-250, "Component Inspection"

.

OK or NG

OK

>> GO TO 17.

NG

>> Replace fuel level sensor unit. Refer to 

FL-11, "Removal and Installation"

.

17.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-323, "Component Inspection"

.

OK or NG

OK

>> GO TO 18.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Removal and Installation"

.

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-32, "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, kinks, looseness and improper

connection. For location, refer to 

EC-475, "System Description"

.

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, kinks, cracks, looseness and

improper connection.
OK or NG

OK

>> GO TO 22.

NG

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

FL-6, "Removal and Installation"

.

22.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-478, "Component Inspection"

.

OK or NG

OK

>> GO TO 23.

NG

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

FL-6, "Removal and Installation"

.

23.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-34, "Component Inspection"

.

OK or NG

OK

>> GO TO 24.

NG

>> Replace fuel level sensor unit. Refer to 

FL-11, "Removal and Installation"

.

P0456 EVAP CONTROL SYSTEM

EC-343

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24.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009484043

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)

1. Wipe clean valve housing.

2. Check valve opening pressure and vacuum.

3. If out of specification, replace fuel filler cap as an assembly.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incor-

rect fuel filler cap is used, the MIL may come on.

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

EC-344

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P0460 FUEL LEVEL SENSOR

P0460 FUEL LEVEL SENSOR

Component Description

INFOID:0000000009484044

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 the 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

INFOID:0000000009484045

NOTE:

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

• If DTC P0460 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-365, "Description"

.

When the vehicle is parked, the fuel level in the fuel tank is naturally 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:0000000009484046

1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-

ducting the next step.

a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.

Turn ignition switch OFF and wait at least 10 seconds.

2. Start engine and wait maximum of 2 consecutive minutes.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to 

EC-344, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009484047

1.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-4, "Work Flow"

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

MWI-36, "Component Function Check"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

BBIA0529E

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)

• Combination meter
• Fuel level sensor

P0460 FUEL LEVEL SENSOR

EC-345

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>> INSPECTION END