Nissan Frontier. Manual - part 438

P0456 EVAP CONTROL SYSTEM

EC-323

< DTC/CIRCUIT DIAGNOSIS >

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NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• EVAP canister for damage

• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.

12.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT

1. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-

noid valve from EVAP canister purge volume control solenoid valve.

2. Start engine.

3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.

4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 14.

13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

3. Disconnect vacuum hose connected to EVAP service port and EVAP canister purge volume control sole-

noid valve from EVAP canister purge volume control solenoid valve.

4. Start engine and let it idle for at least 80 seconds.

5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK

>> GO TO 15.

NG

>> GO TO 14.

14.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to 

EC-41, "Description"

.

OK or NG

OK

>> GO TO 15.

NG

>> Repair or reconnect the hose.

15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-289, "Component Inspection"

.

OK or NG

OK

>> GO TO 16.

NG

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

EM-27, "Exploded View"

.

16.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-241, "Component Inspection"

.

OK or NG

OK

>> GO TO 17.

NG

>> Replace fuel level sensor unit. Refer to 

FL-10, "Removal and Installation"

.

17.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-304, "Component Inspection"

.

Vacuum should exist.

Vacuum should exist.

EC-324

< DTC/CIRCUIT DIAGNOSIS >

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P0456 EVAP CONTROL SYSTEM

OK or NG

OK

>> GO TO 18.

NG

>> Replace EVAP control system pressure sensor. Refer to 

FL-14, "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-41, "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-41

.

OK or NG

OK

>> GO TO 21.

NG

>> Repair or replace hoses and tubes.

21.

CHECK RECIRCULATION LINE

Check recirculation line between fuel filler 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 fuel filler tube.

22.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-453, "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 

EC-442

.

OK or NG

OK

>> GO TO 24.

NG

>> Replace fuel level sensor unit. Refer to 

FL-10, "Removal and Installation"

.

24.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009480982

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

1. Turn ignition switch OFF.
2. Remove fuel filler cap.

P0456 EVAP CONTROL SYSTEM

EC-325

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3. Wipe clean valve housing.

4. Install fuel filler cap adapter (commercial service tool) to fuel filler cap.
5. Check valve opening pressure and vacuum.

6. 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 illuminate.

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-326

< DTC/CIRCUIT DIAGNOSIS >

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P0460 FUEL LEVEL SENSOR

P0460 FUEL LEVEL SENSOR

Component Description

INFOID:0000000009480983

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:0000000009480984

NOTE:

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

Refer to 

EC-151

.

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

to 

EC-349

.

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:0000000009480985

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

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-326, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009480986

1.

CHECK COMBINATION METER FUNCTION

Refer to 

MWI-4

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

MWI-90, "Removal and Installation"

.

2.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

BBIA0629E

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