Mitsubishi Galant 9G. Manual — part 1092
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-668
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 3 −
Catalytic Converter Monitor
.
(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?
YES : Replace the left bank side catalytic converter. Then
go to Step 6.
NO : The inspection is complete.
STEP 6. 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 3 −
Catalytic Converter Monitor
.
(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?
YES : Replace the PCM. Then go to Step 7.
NO : The inspection is complete.
STEP 7. 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 3 −
Catalytic Converter Monitor
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0431 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-669
DTC P0441: Evaporative Emission Control System Incorrect Purge Flow
.
TECHNICAL DESCRIPTION
• PCM detects stuck open condition of evaporative
emission purge solenoid valve and stuck closed
condition of evaporative emission ventilation
solenoid valve by pressure change in fuel tank.
• Stuck open evaporative emission purge solenoid
valve is judged through monitoring leak of evapo-
rative emission system.
• Stuck closed evaporative emission ventilation
solenoid valve is judged after 20 seconds from
end of monitoring leak of evaporative emission
system, or of usual operation of evaporative
emission purge solenoid from ON to OFF.
.
DESCRIPTIONS OF MONITOR METHODS
Fuel tank pressure decreases largely during
purge-cut.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Fuel tank pressure sensor monitor
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AK303026
EVAPORATIVE
EMISSION PURGE
SOLENOID
CONNECTOR: B-05
B-05 (B)
AB
AK303146
CONNECTOR: F-08
AB
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
EVAPORATIVE
EMISSION
CANISTER
F-08 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-670
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• ON duty cycle of the evaporative emission purge
solenoid is 0 percent.
• Engine is running.
• 20 seconds have elapsed since the duty cycle of
the evaporative emission purge solenoid has
turned to 0 percent.
Judgment Criteria
• The pressure in the fuel tank is −2 kPa (−0.59
in.Hg) or less for 0.1 second.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 1
− Evaporative Emission System
Leak Monitor
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Evaporative emission purge solenoid failed.
• Evaporative emission ventilation solenoid failed.
• Fuel tank differential pressure sensor circuit
related part(s) failed.
START
END
NO
NO
NO
NO
YES
YES
YES
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 100msecs
MONITORING CONDITIONS FOR
MALFUNCTION DETECTION
AK302406
FUEL-TANK PRESSURE
< -2kPa (-0.59 in.Hg)
MONITORING CONDITIONS FOR
PASS JUDGEMENT?
REVERTING PRESSURE
DETECTED DURING
EVAP MONITOR?
YES
YES
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-671
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
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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