Infiniti G20 (P11). Manual — part 276
On Board Diagnosis Logic
NCEC0585
NOTE:
If DTC P1440 is displayed with P1448, perform trouble diagno-
sis for DTC P1448 first. (See EC-549.)
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.
SEF323U
Malfunction is detected when EVAP control system has a leak,
EVAP control system does not operate properly.
CAUTION:
I
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.
I
If the fuel filler cap is not tightened properly, the MIL may
come on.
I
Use only a genuine NISSAN rubber tube as a replacement.
Possible Cause
NCEC0586
I
Incorrect fuel tank vacuum relief valve
I
Incorrect fuel filler cap used
I
Fuel filler cap remains open or fails to close.
I
Foreign matter caught in fuel filler cap.
I
Leak is in line between intake manifold and EVAP canister
purge volume control solenoid valve.
I
Foreign matter caught in EVAP canister vent control valve.
I
EVAP canister or fuel tank leaks
I
EVAP purge line (pipe and rubber tube) leaks
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1440 EVAP CONTROL SYSTEM (SMALL LEAK) (POSITIVE PRESSURE)
On Board Diagnosis Logic
EC-515
I
EVAP purge line rubber tube bent.
I
Blocked or bent rubber tube to EVAP control system pressure
sensor
I
Loose or disconnected rubber tube
I
EVAP canister vent control valve and the circuit
I
EVAP canister purge volume control solenoid valve
I
Fuel tank temperature sensor
I
O-ring of EVAP canister vent control valve is missing or dam-
aged.
I
Water separator
I
EVAP canister is saturated with water.
I
Fuel level sensor and the circuit
I
EVAP control system pressure sensor
I
Refueling control valve
I
ORVR system leaks
DTC Confirmation Procedure
NCEC0587
Refer to “P0440 EVAP CONTROL SYSTEM (SMALL LEAK)
(NEGATIVE PRESSURE)”, EC-369.
Diagnostic Procedure
NCEC0588
Refer to “P0440 EVAP CONTROL SYSTEM (SMALL LEAK)
(NEGATIVE PRESSURE)”, EC-370.
DTC P1440 EVAP CONTROL SYSTEM (SMALL LEAK) (POSITIVE PRESSURE)
Possible Cause (Cont’d)
EC-516
Description
NCEC0589
SYSTEM DESCRIPTION
NCEC0589S01
Sensor
Input Signal to ECM
ECM
function
Actuator
Camshaft position sensor
Engine speed
EVAP can-
ister purge
flow control
EVAP canister purge volume
control solenoid valve
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Ignition switch
Start signal
Throttle position sensor
Throttle position
Throttle position switch
Closed throttle position
Heated oxygen sensor 1 (front)
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
Fuel temperature in fuel tank
Vehicle speed sensor
Vehicle speed
This system controls flow rate of fuel vapor from the EVAP canis-
ter. The opening of the vapor by-pass passage in the EVAP canis-
ter purge volume control solenoid valve changes to control the flow
rate. The EVAP canister purge volume control solenoid valve
repeats ON/OFF operation according to the signal sent from the
ECM. The opening of the valve varies for optimum engine control.
The optimum value stored in the ECM is determined by consider-
ing various engine conditions. When the engine is operating, the
flow rate of fuel vapor from the EVAP canister is regulated as the
air flow changes.
SEF337U
COMPONENT DESCRIPTION
NCEC0589S02
The EVAP canister purge volume control solenoid valve uses a
ON/OFF duty to control the flow rate of fuel vapor from the EVAP
canister. The EVAP canister purge volume control solenoid valve
is moved by ON/OFF pulses from the ECM. The longer the ON
pulse, the greater the amount of fuel vapor that will flow through the
valve.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0590
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PURG VOL C/V
I
Engine: After warming up
I
Air conditioner switch “OFF”
I
Shift lever: “N”
I
No-load
Idle (Vehicle stopped)
0%
2,000 rpm
—
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Description
EC-517
ECM Terminals and Reference Value
NCEC0657
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
14
P
EVAP canister purge
volume control solenoid
valve
[Engine is running]
I
Idle speed
BATTERY VOLTAGE
(11 - 14V)
SEF994U
[Engine is running]
I
Engine speed is about 2,000 rpm (More than
100 seconds after starting engine)
BATTERY VOLTAGE
(11 - 14V)
SEF995U
On Board Diagnosis Logic
NCEC0591
Malfunction is detected when the canister purge flow is detected
during the specified driving conditions, even when EVAP canister
purge volume control solenoid valve is completely closed.
Possible Cause
NCEC0592
I
EVAP control system pressure sensor
I
EVAP canister purge volume control solenoid valve (The valve
is stuck open.)
I
EVAP canister vent control valve
I
EVAP canister
I
Hoses
(Hoses are connected incorrectly or clogged.)
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
ECM Terminals and Reference Value
EC-518
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