Infiniti M45 (Y34). Manual — part 469
DTC P1456 EVAP CONTROL SYSTEM
EC-565
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EC
DTC P1456 EVAP CONTROL SYSTEM
PFP:14710
On Board Diagnosis Logic
ABS002VN
This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume
control solenoid valve, using vapor pressure in the fuel tank 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 P1442 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.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0456
0456
Evaporative emission
control system very
small leak (negative
pressure check)
●
EVAP system has a very small leak.
●
EVAP system does not operate prop-
erly.
●
Incorrect fuel tank vacuum relief valve
●
Incorrect fuel filler cap used
●
Fuel filler cap remains open or fails to 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 con-
trol valve.
●
EVAP canister or fuel tank leaks
●
EVAP purge line (pipe and rubber tube) leaks
●
EVAP purge line rubber tube bent
●
Blocked or bent rubber tube to EVAP control sys-
tem pressure sensor
●
Loose or disconnected rubber tube
●
EVAP canister vent control valve and the circuit
●
EVAP canister purge volume control solenoid
valve and the circuit
●
Absolute pressure sensor
●
Fuel tank temperature sensor
●
O-ring of EVAP canister vent control valve is miss-
ing or damaged
●
Water separator
●
EVAP canister is saturated with water
●
EVAP control system pressure sensor
●
Refueling control valve
●
ORVR system leaks
●
Fuel level sensor and the circuit
●
Foreign matter caught in EVAP canister purge vol-
ume control solenoid valve
SEF323U
EC-566
DTC P1456 EVAP CONTROL SYSTEM
●
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
ABS002VO
NOTE:
●
If DTC P1456 is displayed with P1442, perform TROUBLE DIAGNOSIS FOR DTC P1456 first.
●
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 vehi-
cle 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 11V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Make sure the following conditions are met.
FUEL LEVEL SE: 0.25 - 1.15V
COOLAN TEMP/S: 0 - 32
°
C (32 - 90
°
F)
FUEL T/TMP SE: 0 - 35
°
C (32 - 95
°
F)
INT/A TEMP SE: More than 0
°
C (32
°
F)
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-II.
Follow the instruction displayed.
6.
Make sure that “OK” is displayed.
If “NG” is displayed, refer to
EC-568, "Diagnostic Procedure"
NOTE:
●
If the engine speed cannot be maintained within the range displayed on CONSULT-II screen, go
to
.
●
Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid
valve properly.
PBIB2644E
PBIB0837E
DTC P1456 EVAP CONTROL SYSTEM
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EC
Overall Function Check
ABS002VP
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/cm
2
, 0.6 psi).
1.
Attach the EVAP service port adapter securely to the EVAP ser-
vice port.
2.
Set the pressure pump and a hose.
3.
Also set a vacuum gauge via 3-way connector and a hose.
4.
Turn ignition switch ON.
5.
Connect GST and select MODE 8.
6.
Using MODE 8 control the EVAP canister vent control valve
(close) and vacuum cut valve bypass valve (open).
7.
Apply pressure and make sure the following conditions are sat-
isfied.
Pressure to be applied: 2.7 kPa (20 mmHg, 0.79 inHg)
Time to be waited after the pressure drawn in to the EVAP
system and the pressure to be dropped: 60 seconds and
the pressure should not be dropped more than 0.4 kPa (3 mmHg, 0.12 inHg).
If NG, go to
EC-568, "Diagnostic Procedure"
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.
PBIB1114E
SEF462UI
EC-568
DTC P1456 EVAP CONTROL SYSTEM
Diagnostic Procedure
ABS002VQ
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
>>
●
Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.
●
Retighten until ratcheting 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
Refer to
EC-695, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)"
OK or NG
OK
>> GO TO 5.
NG
>> Replace fuel filler cap with a genuine one.
SEF915U
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