Mitsubishi Galant 9G. Manual — part 1093
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-672
STEP 2. Using scan tool MB991958, check data list item 73:
Fuel Tank Differential Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Remove the fuel cap.
(3) Set scan tool MB991958 to the data reading mode for item
73, Fuel Tank Differential Pressure Sensor.
• The fuel tank differential pressures should be −3.3 to 3.3
kPa (
−0.97 to 0.97 in.Hg).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel tank pressure between
−3.3 to 3.3 kPa (−0.97
to 0.97 in.Hg)?
YES : Go to Step 3.
NO : Refer to DTC P0451 - Evaporative Emission Control
System Pressure Sensor Range/Performance
STEP 3. Using scan tool MB991958, check actuator test
item 08: Evaporative Emission Purge Solenoid.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the actuator test mode for item
08, Evaporative emission purge solenoid.
• An operation sound should be heard and vibration
should be felt when the evaporative emission purge
solenoid is operated.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?
YES : Go to Step 4.
NO : Replace the evaporative emission purge solenoid.
Then go to Step 5.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-673
STEP 4. Using scan tool MB991958, check actuator test
item 29: Evaporative Emission Ventilation Solenoid.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool MB991958 to the actuator test mode for item
29, Evaporative emission ventilation solenoid.
• An operation sound should be heard and vibration
should be felt when the evaporative emission ventilation
solenoid is operated.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?
YES : Repair or replace the vent hose and air filter. Then go
to Step 5.
NO : Replace the evaporative emission ventilation
solenoid. Then go to Step 5.
STEP 5 Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 1 −
Evaporative Emission System Leak Monitor
(2) Read the diagnostic trouble code.
Q: Is DTC P0441 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-674
DTC P0442: Evaporative Emission System Leak Detected (Small Leak)
.
AC306278
A
B
C
D
E
F
G
O
P
Q
N
M
L
H
I
J
K
AB
INTAKE MANIFOLD PLENUM
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
AC306388AB
EVAPORATIVE EMISSION
PURGE SOLENOID
AC305053AC
EVAPORATIVE EMISSION
VENTILATION SOLENOID
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-675
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.
.
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
.
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