DTC Detection Logic

This diagnosis detects a very large leak (fuel filler cap fell off etc.) in EVAP system between the fuel tank and EVAP canister purge volume control solenoid valve.

Fig 1: EVAP Control System Diagram

Courtesy of NISSAN NORTH AMERICA, INC.

DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No.	Trouble diagnosis name	DTC detecting condition	Possible cause
P0455	EVAP control system gross leak detected	EVAP control system has a very large leak such as fuel filler cap fell off, EVAP control system does not operate properly.	Fuel filler cap remains open or fails to close. Incorrect fuel tank vacuum relief valve Incorrect fuel filler cap used 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 control system pressure sensor Refueling EVAP vapor cut valve ORVR system leaks

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

PRECONDITIONING
Never remove fuel filler cap during the DTC CONFIRMATION PROCEDURE.

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

NOTE: Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.

TESTING CONDITION:
- Perform "DTC WORK SUPPORT" when the fuel level is between 1/4 and 3/4 full, and vehicle is placed on flat level surface.
- Open engine hood before conducting the following procedures.
Do you have CONSULT-III?

YES: GO TO 2.

NO: GO TO 4.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Tighten fuel filler cap securely until ratcheting sound is heard.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
5. Make sure that the following conditions are met.
  COOLAN TEMP/S: 0-70°C (32-158°F)
  
  INT/A TEMP SE: 0-60°C (32-140°F)
6. Select "EVAP SML LEAK P0442/P1442" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT-III.
  Follow the instruction displayed.
  
  NOTE: If the engine speed cannot be maintained within the range displayed on the CONSULT-III screen, go to "BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT ".
Which is displayed on CONSULT-III screen?

OK: Go to "DIAGNOSIS PROCEDURE ".

NG: GO TO 3.
CHECK DTC
Check DTC.

Which DTC is detected?

P0455: Go to "DIAGNOSIS PROCEDURE ".

P0442: Go to "DIAGNOSIS PROCEDURE ".
PERFORM DTC CONFIRMATION PROCEDURE
With GST

NOTE: Be sure to read the explanation of DRIVING PATTERN in "HOW TO SET SRT CODE " before driving vehicle.
1. Start engine.
2. Drive vehicle according to DRIVING PATTERN.
3. Stop vehicle.
4. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES-1: P0455: Go to "DIAGNOSIS PROCEDURE ".

YES-2: P0442: Go to "DIAGNOSIS PROCEDURE ".

YES-3: P0441: Go to "DIAGNOSIS PROCEDURE ".

NO: INSPECTION END