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On Board Diagnosis Logic
NGEC1044
NOTE:
If DTC P1440 is displayed with P1448, perform trouble diagno-
sis for DTC P1448 first. (See EC-519.)
This diagnosis detects leaks in the EVAP purge line using of vapor
pressure in the fuel tank.
The EVAP canister vent control valve is closed to shut the EVAP
purge line. The vacuum cut valve bypass valve will then be opened
to clear the line between the fuel tank and the EVAP canister purge
volume control solenoid valve. The EVAP control system pressure
sensor can now monitor the pressure inside the fuel tank.
If pressure increases, the ECM will check for leaks in the line
between the vacuum cut valve and EVAP canister purge volume
control solenoid valve.
SEF865Z
Malfunction is detected when EVAP control system has a leak,
EVAP control system does not operate properly.
CAUTION:
쐌 Use only a genuine NISSAN fuel filler cap as a replace-
ment. If an incorrect fuel filler cap is used, the MIL may
come on.
쐌 If the fuel filler cap is not tightened properly, the MIL may
come on.
쐌 Use only a genuine NISSAN rubber tube as a replacement.
Possible Cause
NGEC1045
쐌 Incorrect fuel tank vacuum relief valve
쐌 Incorrect fuel filler cap used
쐌 Fuel filler cap remains open or fails to close
쐌 Foreign matter caught in fuel filler cap
쐌 Leak is in line between intake manifold and EVAP canister
purge volume control solenoid valve
쐌 Foreign matter caught in EVAP canister vent control valve
쐌 EVAP canister
쐌 EVAP purge line (pipe and rubber tube) leaks
DTC P1440 EVAP CONTROL SYSTEM (SMALL LEAK)
(POSITIVE PRESSURE)
KA24DE
On Board Diagnosis Logic
EC-474
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