Mitsubishi Galant (2004+). Manual — part 1239
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-649
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0451 set?
YES : Refer to DTC P0451 - Evaporative Emission Control
System Pressure Sensor Range/Performance
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-650
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-651
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 procedure 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-652
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
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