Mitsubishi Galant (2004+). Manual — part 977
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-725
DTC P0456: Evaporative Emission System Leak Detected (Very Small Leak)
.
AC306277
A
B
C
D
E
F
G
H
P
Q
R
O
N
M
I
J
K
L
AB
INTAKE MANIFOLD
FUEL TANK
EVAPORATIVE EMISSION
VENTILATION SOLENOID
CHECK VALVE
EVAPORATIVE EMISSION
PURGE SOLENOID
EVAPORATIVE
EMISSION CANISTER
ONBOARD REFUELING
VAPOR RECOVERY(ORVR)
VENT VALVE MODULE
SYSTEM DIAGRAM
CHAMBER
AC306400
AB
EVAPORATIVE EMISSION CANISTER
AC305066AC
EVAPORATIVE EMISSION
PURGE SOLENOID
INTAKE
MANIFOLD
AC305053AC
EVAPORATIVE EMISSION
VENTILATION SOLENOID
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-726
TECHNICAL DESCRIPTION
• The PCM monitors the Evaporative Emission
(EVAP) System pressure.
• The PCM controls the evaporative emission ven-
tilation solenoid. It closes the evaporative emis-
sion ventilation solenoid to seal the evaporative
emission canister side of the system.
• The evaporative emission purge solenoid is
opened to allow manifold vacuum to create low
pressure (vacuum) in the EVAP system.
• When the EVAP system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid is closed and the fuel system vacuum is
maintained at 2 kPa (0.29 psi).
• The PCM determines whether there is a leak in
the EVAP system by monitoring the vacuum
inside the fuel tank.
• The test is stopped when fuel vapor pressure
exceeds predetermined limits.
.
DESCRIPTIONS OF MONITOR METHODS
• Measure reverting pressure after depressurizing
by intake manifold negative pressure and detect
malfunction if reverting pressure rises largely.
.
MONITOR EXECUTION
• Once per driving cycle.
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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)
• Mass airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-727
LOGIC FLOW CHARTS (Monitor Sequence)
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DTC SET CONDITIONS
Check Conditions A: At Start up
• Intake air temperature is 36°C (97°F) or less
when the engine is started.
• The engine coolant temperature is 36°C (97°F) or
less when the engine is started.
• The fuel level sensor output voltage is 2.4 − 3.7
volts when the engine starts and the amount of
remaining fuel is 40
− 85 percent of capacity.
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) <2.4L ENGINE>
13A-728
Check Conditions B: For Test to Run
• Barometric pressure is greater than 76 kPa (11
psi).
• The fuel tank temperature is 33°C (91°F) or less.
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
Check Conditions C: For Test to Stop
• Engine coolant temperature is greater than 20 °C
(68
°F).
• Intake air temperature is greater than -10 °C (14
°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises in the fuel tank is less
than 324 Pa (0.047 psi).
• 10 seconds have elapsed from the start of the
previous monitoring.
• Monitoring time: 10 − 14 minutes.
Judgment Criteria
• Internal pressure of the fuel tank has changed
more than 1,177
− 1,373 Pa (0.177 − 0.199 psi) in
128 seconds after the 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
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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 evaporative emission canister
seal.
• Malfunction of the fuel tank, purge line or vapor
line seal.
• Malfunction of the evaporative emission ventila-
tion solenoid.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
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