Engine Controls For California

DTC P0456 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

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 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 come on.
- If the fuel filler cap is not tightened properly, the MIL may come on.
- Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

NOTE:
-If DTC P0456 is displayed with P0442, first perform trouble diagnosis for DTC P0456.
-After repair, make sure that the hoses and clips are installed properly.
- If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION:
-Open engine hood before conducting following procedure.
-If any of following conditions are met just before the DTC confirmation procedure, leave the vehicle for more than 1 hour.
-Fuel filler cap is removed.
-Refilled or drained the fuel.
-EVAP component parts is/are removed.
-Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

With CONSULT

1.Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
2.Make sure the following conditions are met.

If NG, turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle) or refilling/draining fuel until the output voltage condition of the "FUEL LEVEL SE" meets within the range above and leave the vehicle for more than 1 hour. Then start from step 1).
3.Turn ignition switch OFF and wait at least 10 seconds.
4.Turn ignition switch ON.
5.Select "EVAP V/S LEAK P0456/P1456" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
Follow the instruction displayed.
6.Make sure that "OK" is displayed.
If "NG" is displayed, .
NOTE:
If the engine speed cannot be maintained within the range displayed on CONSULT screen, go to
Basic Inspection For California.

Overall Function Check

With GST

Use this procedure to check the overall function of the EVAP very small leak function. During this check, a 1st trip DTC might not be confirmed.

CAUTION:
- Never use compressed air, doing so may damage the EVAP system.
- Do not start engine.
- Do not exceeded 4.12 kPa (0.042 kg/cm2, 0.6 psi).

1.Attach the EVAP service port adapter securely to the EVAP service port (2).
-EVAP canister purge volume control solenoid valve (1)
-White arrow indicates : Vehicle front

2.Set the pressure pump and a hose.
3.Also set the pressure pump with pressure gauge to the EVAP
service port adapter.
4.Turn ignition switch ON.
5.Connect GST and select Service $08.
6.Using Service $08 control the EVAP canister vent control valve (close).
7.Apply pressure and make sure the following conditions are satisfied.

If NG, go to .
If OK, go to next step.
8.Disconnect GST.
9.Start engine and warm it up to normal operating temperature.
10.Turn ignition switch OFF and wait at least 10 seconds.
11.Restart engine and let it idle for 90 seconds.
12.Keep engine speed at 2,000 rpm for 30 seconds.
13.Turn ignition switch OFF.
NOTE:
For more information, refer to GST Instruction Manual.

Diagnosis Procedure

1. CHECK FUEL FILLER CAP DESIGN

1.Turn ignition switch OFF.

2.Check for genuine NISSAN fuel filler cap design.
OK or NG
OK- GO TO 2.
NG- Replace with genuine NISSAN fuel filler cap.

2. CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.
OK or NG
OK- GO TO 3.
NG- 1.Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
2. Retighten until reteaching sound is heard.

3. CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.
OK or NG
OK- GO TO 5.
NG- GO TO 4.

4. CHECK FUEL TANK VACUUM RELIEF VALVE

For California.
OK or NG
OK- GO TO 5.
NG- Replace fuel filler cap with a genuine one.

5. INSTALL THE PRESSURE PUMP

To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. For the location of EVAP
service port (2), For California.
- EVAP canister purge volume control solenoid valve (1)
-White arrow indicates : Vehicle front
NOTE:
Improper installation of the EVAP service port adapter to the
EVAP service port may cause leaking.

With CONSULT-GO TO 6.
Without CONSULT-GO TO 7.

6. CHECK FOR EVAP LEAK

With CONSULT
1.Turn ignition switch ON.
2.Select "EVAP SYSTEM CLOSE" of "WORK SUPPORT" mode with CONSULT.
3.Touch "START" and apply pressure into the EVAP line until the pressure indicator reaches the middle of the bar graph.

CAUTION:
- Never use compressed air or a high pressure pump.
- Do not exceed 4.12 kPa (0.042 kg/cm2, 0.6 psi) of pressure in the system.

2.Apply 12 V DC to EVAP canister vent control valve (3). The valve will close. (Continue to apply 12 V until the end of test.)
-This illustration is a view from under vehicle
-EVAP control system pressure sensor (1)
-EVAP canister (2)
3.Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (0.013 to 0.027 kg/cm2, 0.2 to 0.4 psi), then remove pump and EVAP service port adapter.

CAUTION:
- Never use compressed air or a high pressure pump.
- Do not exceed 4.12 kPa (0.042 kg/cm2, 0.6 psi) of pressure in the system.

4.Using EVAP leak detector, locate the EVAP leak. For the leak detector, refer to the instruction manual for more details.
For California.
OK or NG
OK- GO TO 8.
NG- Repair or replace.

8. CHECK DRAIN FILTER

.
OK or NG
OK- GO TO 9.
NG- Replace drain filter. Removal and Installation.

9. CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.
- EVAP canister vent control valve is installed properly.
Removal and Installation.
- EVAP canister vent control valve.
Engine Controls For California.
OK or NG
OK- GO TO 10.
NG- Repair or replace EVAP canister vent control valve and O-ring. Removal and Installation.

10. CHECK IF EVAP CANISTER SATURATED WITH WATER

Remove EVAP canister with EVAP canister vent control valve and
EVAP control system pressure sensor attached.
Does water drain from the EVAP canister?
YES- GO TO 11.
NO (With CONSULT)-GO TO 13.
NO (Without CONSULT)-GO TO 14.

11. CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.

OK or NG
OK (With CONSULT)-GO TO 13.
OK (Without CONSULT)-GO TO 14.
NG- GO TO 12.

12. 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. Removal and Installation.

13. 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.
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 16.
NG- GO TO 15.

14. 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.

OK or NG
OK- GO TO 17.
NG- GO TO 15.

15. CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. For California.
OK or NG
OK- GO TO 16.
NG- Repair or reconnect the hose.

16. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Engine Controls For California.
OK or NG
OK- GO TO 17.
NG- Replace EVAP canister purge volume control solenoid valve. Component.

17. CHECK FUEL TANK TEMPERATURE SENSOR

Engine Controls For California.
OK or NG
OK- GO TO 18.
NG- Replace fuel level sensor unit. Removal and Installation.

18. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Engine Controls For California.
OK or NG
OK- GO TO 19.
NG- Replace EVAP control system pressure sensor. Removal and Installation.

19. CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
For California.
OK or NG
OK- GO TO 20.
NG- Repair or reconnect the hose.

20. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.
- GO TO 21.

21. CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper connection.
OK or NG
OK- GO TO 22.
NG- Repair or replace hoses and tubes. For California.

22. CHECK RECIRCULATION LINE

Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and improper connection.
OK or NG
OK- GO TO 23.
NG- Repair or replace hose, tube or filler neck tube. For California.

23. CHECK REFUELING EVAP VAPOR CUT VALVE

On Board Refueling Vapor Recovery (ORVR) For California.
OK or NG
OK- GO TO 24.
NG- Replace refueling EVAP vapor cut valve with fuel tank. Removal and Installation.

24. CHECK FUEL LEVEL SENSOR

Component.
OK or NG
OK- GO TO 25.
NG- Replace fuel level sensor unit. Removal and Installation.

25. CHECK INTERMITTENT INCIDENT

Refer to Trouble Diagnosis For Intermittent Incident
-INSPECTION END

Component Inspection

DRAIN FILTER

1.Check visually for insect nests in the drain filter air inlet.
2.Check visually for cracks or flaws in the appearance.
3.Check visually for cracks or flaws in the hose.

4.Blow air into port A and check that it flows freely out of port B.
5.Block port B.
6.Blow air into port A and check that there is no leakage.
7.If NG, replace drain filter. Removal and Installation.