Mitsubishi Montero Sport (2004+). Manual — part 298
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-605
DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak)
.
AC005137
AB
A
Q
O
N
P
B
C
M*
M*
E
A
D
M
E
L
K
F
G
I
H
FUEL TANK
EVAPORATIVE
EMISSION
CANISTER
EVAPORATIVE
EMISSION
PURGE SOLENOID
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
CHECK VALVE A
CHECK VALVE B
INTAKE MANIFOLD
SYSTEM DIAGRAM
J
VENT VALVE MODULE
NOTE
*: Manifold port
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
ACX01347AB
EVAPORATIVE EMISSION
PURGE SOLENOID
AC004938AB
EVAPORATIVE EMISSION
VENTILATION SOLENOID
AC005146
EVAPORATIVE EMISSION CANISTER
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-606
TECHNICAL DESCRIPTION
• The fuel tank may be under a slight positive and
negative pressure depending on the state of the
evaporative emission system. The PCM monitors
and responds to these pressure changes. If the
pressure varies from the specified range, the
PCM will set DTC P0455.
• The PCM energizes the evaporative emission
ventilation solenoid to shut off the evaporative
emission canister outlet port.
• The evaporative emission purge solenoid is to
apply engine manifold vacuum to the evaporative
emission system.
• When the fuel system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid is turned "OFF" and the fuel system vac-
uum is maintained at 2 kPa (0.29 psi).
• The PCM determines if there is a leak or clog in
the fuel system by measuring the change of vac-
uum inside the fuel tank.
• The test is stopped when fuel vapor pressure is
determined to be too high.
.
DESCRIPTIONS OF MONITOR METHODS
• Depressurizing EVAP system by intake manifold
negative pressure is impossible within specified
period.
.
MONITOR EXECUTION
• Once per driving cycle.
.
MONITOR EXECUTION CONDITIONS (Other
Monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Evaporative emission purge solenoid monitor
• Evaporative emission purge system monitor
• Fuel tank differential pressure sensor monitor
• Evaporative emission ventilation solenoid monitor
• Fuel level sensor monitor
• Fuel temperature sensor monitor
Sensor (The sensors below are determined to be
normal)
• Volume airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-607
LOGIC FLOW CHARTS (Monitor Sequence)
.
AC306649
0.04in, 0.02in GROSS LEAK MONITOR
START
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
MONITORING
CONDITIONS?
DEPRESSURIZE FUEL TANK PRESSURE
GROSS LEAK
MONITORING CONDITIONS
SHUT PURGE LINE
MEASURE REVERTING
PRESSURE : PFT
PFT > PT
SPECIFIED TIMES
MONITORED
MALFUNCTION
END
SPECIFIED TIMES
HAVE PASSED
MALFUNCTION
(GROSS LEAK)
GOOD
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-608
DTC SET CONDITIONS
Test Conditions:
• Engine coolant temperature is less than 36 °C
(97
°F) when the engine is started.
• Intake air temperature is less than 36 °C (97 °F)
when the engine is started.
• Engine coolant temperature is greater than 58 °C
(136
°F) When the amount of remaining fuel is 15
− 40 percent of capacity upon engine start up.
• Engine coolant temperature is greater than 20 °C
(68
°F) when the amount of remaining fuel is 40 −
85 percent of capacity upon engine start up.
• Intake air temperature is greater than 5 °C (41
°F).
• Fuel temperature is less than 36 °C (97 °F).
• Barometric pressure is greater than 76 kPa (11
psi).
• Volumetric efficiency is between 20 and 70 per-
cent.
• Fuel tank differential pressure sensor output volt-
age is 1
− 4 volts.
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank rises to 451
Pa (0.065 psi) or less and the amount of remain-
ing fuel is 15
− 40 percent of capacity upon
engine start up.
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank rises to 324
Pa (0.047 psi) or less and the amount of remain-
ing fuel is 40
− 85 percent of capacity upon
engine start up.
• Engine speed is greater than 1,600 r/min.
• 10 seconds have elapsed from the start of the
previous monitoring.
• Monitoring time: 150 seconds.
Judgment Criteria
• The fuel tank internal pressure is greater than 2
kPa (0.29 psi) after the evaporative emission
purge solenoid has been driven when the fuel
tank and vapor line were closed.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak
Monitor
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Loose fuel cap.
• Fuel cap relief pressure is incorrect.
• Malfunction of the fuel overflow limiter valve.
• Purge line or vapor line is clogged.
• Malfunction of the fuel tank, purge line or vapor
line seal.
• Malfunction of the evaporative emission purge
solenoid.
• Malfunction of the evaporative emission ventila-
tion solenoid.
• Malfunction of the fuel tank differential pressure
sensor.
• Malfunction of the evaporative emission canister
seal.
• Evaporative emission canister is clogged.
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