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Nissan Frontier. Manual - part 436

P0455 EVAP CONTROL SYSTEM

EC-315

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

4. Using EVAP leak detector, locate the EVAP leak. For the leak

detector, refer to the instruction manual for more details. Refer

EC-469, "How to Detect Fuel Vapor Leakage"

OK or NG

>> GO TO 12.

>> Repair or replace.

11.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT

1. Disconnect vacuum hose from EVAP canister purge volume control solenoid valve at EVAP service port.

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

>> GO TO 14.

>> GO TO 13.

12.

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 from EVAP canister purge volume control solenoid valve at EVAP service port.

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

>> GO TO 15.

>> GO TO 13.

13.

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to

EC-41, "Description"

OK or NG

OK (With CONSULT)>>GO TO 14.

OK (Without CONSULT)>>GO TO 15.

>> Repair or reconnect the hose.

14.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT

1. Start engine.

2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies

according to the valve opening.

OK or NG

>> GO TO 16.

>> GO TO 15.

15.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-289, "Component Inspection"

OK or NG

SEF200U

Vacuum should exist.

EC-316

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0455 EVAP CONTROL SYSTEM

>> GO TO 16.

>> 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

>> GO TO 17.

>> 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"

OK or NG

>> GO TO 18.

>> Replace EVAP control system pressure sensor. Refer to

FL-14, "Removal and Installation"

18.

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

>> GO TO 19.

>> Repair or replace hoses and tubes.

19.

CHECK RECIRCULATION LINE

Check recirculation line between fuel filler tube and fuel tank for clogging, kinks, cracks, looseness and

improper connection.
OK or NG

>> GO TO 20.

>> Repair or replace hoses, tubes or fuel filler tube.

20.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to

EC-453, "Component Inspection"

OK or NG

>> GO TO 21.

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

FL-6, "Removal and Installation"

21.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000009480977

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

1. Turn ignition switch OFF.
2. Remove fuel filler cap.
3. Wipe clean valve housing.

SEF445Y

P0455 EVAP CONTROL SYSTEM

EC-317

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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.

Pressure: 15.3 - 20.0 kPa

(0.156 - 0.204 kg/cm

, 2.22 - 2.90 psi)

Vacuum:

−6.0 to −3.3 kPa
(

−0.061 to −0.034 kg/cm

−0.87 to −0.48 psi)

SEF943S

EC-318

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0456 EVAP CONTROL SYSTEM

P0456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

INFOID:0000000009480978

This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume

control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leak

diagnosis.

If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.

If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.

If ECM judges that there are no leaks, the diagnosis will be OK.

CAUTION:

• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the

MIL may illuminate.

• If the fuel filler cap is not tightened properly, the MIL may illuminate.

• Use only a genuine NISSAN rubber tube as a replacement.

PBIB3640E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0456
0456

Evaporative emission
control system very
small leak (negative
pressure check)

• EVAP system has a very small leak.
• EVAP system does not operate

properly.

• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or fails to close.
• Foreign matter caught in fuel filler cap.
• Leak is in line between intake manifold and EVAP

canister purge volume control solenoid valve.

• Foreign matter caught in EVAP canister vent control

valve.

• EVAP canister or fuel tank leaks
• EVAP purge line (pipe and rubber tube) leaks
• EVAP purge line rubber tube bent
• Loose or disconnected rubber tube
• EVAP canister vent control valve and the circuit
• EVAP canister purge volume control solenoid valve

and the circuit

• Fuel tank temperature sensor
• O-ring of EVAP canister vent control valve is missing

or damaged

• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leaks
• Fuel level sensor and the circuit
• Foreign matter caught in EVAP canister purge vol-

ume control solenoid valve

Content .. 434 435 436 437 ..