Nissan Sentra manuals

Nissan Sentra Service Manual: P0456 EVAP Control system

DTC Logic

DTC DETECTION LOGIC

This diagnosis detects leaks in the EVAP line between fuel tank and EVAP canister purge volume control solenoid valve, using the negative pressure caused by decrease of fuel temperature in the fuel tank after turning ignition switch OFF.

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


DTC No.

CONSULT screen terms (Trouble diagnosis content)

DTC detecting condition

Possible cause

P0456 EVAP VERY SML LEAK [Evaporative emission system leak detected (very small leak)]
  • EVAP system has a leak.
  • EVAP system does not operate properly.
  • Incorrect fuel tank vacuum relief valve
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or does not 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 volume control solenoid valve

CAUTION:

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting 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.

Do you have CONSULT? YES >> GO TO 2.

NO >> GO TO 4.

2.PERFORM DTC CONFIRMATION PROCEDURE-1

WITH CONSULT


  1. Turn ignition switch ON and select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
  2. Start engine and wait at idle until “OFF” of “EVAP DIAG READY” changes to “ON”.

NOTE:

It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.

  1. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

  1. Turn ignition switch ON and select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE” using CONSULT
  2. Check that “EVAP LEAK DIAG” indication.

Which is displayed on CONSULT? CMPLT>> GO TO 3.

YET >> Perform DTC CONFIRMATION PROCEDURE again. GO TO 1.

3.PERFORM DTC CONFIRMATION PROCEDURE-2

Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed toEC-321, "Diagnosis Procedure".

NO >> INSPECTION END.

4.PERFORM DTC CONFIRMATION PROCEDURE

WITH GST


  1. Start engine and wait engine idle for at least 2 hours.
  2. Turn ignition switch OFF and wait at least 90 minutes.

NOTE:

Never turn ignition switch ON during 90 minutes.

  1. Turn ignition switch ON.
  2. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-321, "Diagnosis Procedure".

NO >> INSPECTION END.

Diagnosis Procedure

1.CHECK FUEL FILLER CAP DESIGN

  1. Turn ignition switch OFF.
  2. Check for genuine NISSAN fuel filler cap design.

Is the inspection result normal? YES >> GO TO 2.

NO >> Replace with genuine NISSAN fuel filler cap.

2.CHECK FUEL FILLER CAP INSTALLATION


2.CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.

Is the inspection result normal? YES >> GO TO 3.

NO >> Open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Then retighten until reteaching sound is heard.

3.CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.

Is the inspection result normal? YES >> GO TO 5.

NO >> GO TO 4.

4.CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to EC-325, "Component Inspection".

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace fuel filler cap with a genuine one.

5.CHECK FOR EVAP LEAK

Refer to EC-482, "Inspection".

Is there any leak in EVAP line? YES >> Repair or replace.

NO >> GO TO 6.

6.CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.

Is the inspection result normal? YES >> GO TO 7.

NO >> Repair or replace EVAP canister vent control valve and O-ring. Refer to FL-15, "Removal and Installation".

7.CHECK IF EVAP CANISTER SATURATED WITH WATER

  1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
  2. Check if water will drain from the EVAP canister.

Does water drain from EVAP canister? YES >> GO TO 8.

NO-1 >> With CONSULT: GO TO 10.

NO-2 >> Without CONSULT: GO TO 11.

8.CHECK EVAP CANISTER


8.CHECK EVAP CANISTER

Weigh the EVAP canister assembly with the EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to FL-15, "Removal and Installation".

The weight should be less than 2.1 kg (4.6 lb).

Is the inspection result normal? YES-1 >> With CONSULT: GO TO 10.

YES-2 >> Without CONSULT: GO TO 11.

NO >> GO TO 9.

9.DETECT MALFUNCTIONING PART

Check the following.

>> Repair hose or replace EVAP canister. Refer to FL-15, "Removal and Installation".

10.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT


  1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
  2. Start engine and let it idle.
  3. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
  4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.
  5. Check vacuum hose for vacuum.

Vacuum should exist.

Is the inspection result normal? YES >> GO TO 13.

NO >> GO TO 12.

11.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 to 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.

Vacuum should exist.

Is the inspection result normal? YES >> GO TO 13.

NO >> GO TO 12.

12.CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection.

Is the inspection result normal?

YES >> GO TO 13.

NO >> Repair or reconnect the hose.

13.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Check the EVAP canister purge volume control solenoid valve. Refer to EC-296, "Component Inspection".

Is the inspection result normal? YES >> GO TO 14.

NO >> Replace EVAP canister purge volume control solenoid valve. Refer to EM-27, "Exploded View".

14.CHECK FUEL TANK TEMPERATURE SENSOR

Check the fuel tank temperature sensor. Refer to EC-257, "Component Inspection".

Is the inspection result normal? YES >> GO TO 15.

NO >> Replace fuel level sensor unit. Refer to FL-6, "Removal and Installation".

15.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check the EVAP control system pressure sensor. Refer to FL-15, "Removal and Installation".

Is the inspection result normal? YES >> GO TO 16.

NO >> Replace EVAP control system pressure sensor. Refer to FL-15, "Removal and Installation".

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-49, "EVAPORATIVE EMISSION SYSTEM : System Description".

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 connection.

For location, refer to EC-49, "EVAPORATIVE EMISSION SYSTEM : System 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 fuel filler 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 fuel filler tube. Refer to FL-10, "Exploded View".

20.CHECK REFUELING EVAP VAPOR CUT VALVE

Check the refueling EVAP vapor cut valve. Refer to FL-13, "Inspection".

Is the inspection result normal? YES >> GO TO 21.

NO >> Replace refueling EVAP vapor cut valve with fuel tank. Refer to FL-10, "Removal and Installation".

21.CHECK FUEL LEVEL SENSOR

Check the fuel level sensor. Refer to MWI-59, "Component Inspection".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace fuel level sensor unit. Refer to FL-6, "Removal and Installation".

Component Inspection

1.CHECK FUEL FILLER CAP

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


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

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm2, 2.22 - 2.90 psi)

Vacuum: −6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm2, −0.87 to −0.48 psi)

Is the inspection result normal?


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 illuminate.

>> INSPECTION END

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