DTC Description

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.

Courtesy of NISSAN NORTH AMERICA, INC.

DTC DETECTION LOGIC

DTC		CONSULT screen terms(Trouble diagnosis content)	DTC detection condition
P0456	00	EVAP VERY SML LEAK[EVAP system leak detected (very small leak)]	Diagnosis condition	-
			Signal (terminal)	-
			Threshold	EVAP system has a leak EVAP system does not operate properly
			Diagnosis delay time	-

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.

POSSIBLE CAUSE

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

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

Do you have CONSULT '

>>

GO TO 2.

>>

GO TO 4.
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 the 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".
3. Turn ignition switch OFF and wait at least 90 minutes.
  NOTE: Never turn ignition switch ON during 90 minutes.
4. Turn ignition switch ON and select "EVAP LEAK DIAG" in "DATA MONITOR" mode of "ENGINE" using CONSULT.
5. Check that "EVAP LEAK DIAG" indication.
Which is displayed on CONSULT '

CMPLT>>

GO TO 3.

YET>>

Perform DTC CONFIRMATION PROCEDURE again. GO TO 1.
PERFORM DTC CONFIRMATION PROCEDURE-2
Check 1st trip DTC.

Is 1st trip DTC detected?

>>

Proceed to Diagnosis Procedure .

>>

To check malfunction symptom before repair: Refer to Intermittent Incident .

>>

Confirmation after repair: INSPECTION END
PERFORM DTC CONFIRMATION PROCEDURE
With GST
1. Start the 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.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
Is 1st trip DTC detected?

>>

Proceed to Diagnosis Procedure .

>>

To check malfunction symptom before repair: Refer to Intermittent Incident .

>>

Confirmation after repair: INSPECTION END