Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0456 EVAP control system
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.

CHECK FUEL FILLER CAP DESIGN

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, "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, "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.

  • EVAP canister vent control valve is installed properly.

    Refer to FL, "Exploded View".

  • EVAP canister vent control valve.

    Refer to EC, "Component Inspection".

Is the inspection result normal?

YES >> GO TO 7.

NO >> Repair or replace EVAP canister vent control valve and Oring. Refer to FL, "Removal and Installation".

7.CHECK IF EVAP CANISTER SATURATED WITH WATER

  1. Remove EVAP canister (1) with EVAP canister vent control valve (2) 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.

NO1 >> With CONSULT: GO TO 10.

NO2 >> Without CONSULT: GO TO 11.

CHECK IF EVAP CANISTER SATURATED WITH WATER

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, "Removal and Installation".

The weight should be less than 1.6 kg (3.5 lb).

Is the inspection result normal?

YES1 >> With CONSULT: GO TO 10.

YES2 >> Without CONSULT: GO TO 11.

NO >> GO TO 9.

9.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. Refer to FL, "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. Refer to EM, "Exploded View".

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, "Component Inspection".

Is the inspection result normal?

YES >> GO TO 14.

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

14.CHECK FUEL TANK TEMPERATURE SENSOR

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

Is the inspection result normal?

YES >> GO TO 15.

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

15.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

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

Is the inspection result normal?

YES >> GO TO 16.

NO >> Replace EVAP control system pressure sensor. Refer to FL, "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, "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, "On Board Refueling Vapor Recovery (ORVR)".

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.

20.CHECK REFUELING EVAP VAPOR CUT VALVE

Check the refueling EVAP vapor cut valve. Refer to EC, "Component Inspection (Refueling EVAP vapor cut valve)".

Is the inspection result normal?

YES >> GO TO 21.

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

21.CHECK FUEL LEVEL SENSOR

Check the fuel level sensor. Refer to MWI, "Component Inspection" (TYPE A) or MWI, "Component Inspection" (TYPE B). Check the vehicle type to confirm the service information in MWI section. Refer to MWI, "Information".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".

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

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