Mitsubishi Galant (2004+). Manual — part 842
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-185
STEP 12. Check harness connector B-22 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 14.
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-186
STEP 13. Check for harness damage between engine
coolant temperature sensor connector B-104 (terminal No.
1) and PCM connector B-22 (terminal No. 93).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 14.
NO : Repair it. Then go to Step 14.
STEP 14. 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 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0125 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-187
DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
.
TECHNICAL DESCRIPTION
• The PCM checks the time for the cooling water
temperature to reach the judgment temperature.
.
DESCRIPTIONS OF MONITOR METHODS
Engine coolant temperature does not reach 77
°C
(171
°F) within specified period after cold start.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
.
DTC SET CONDITIONS
Logic Flow Chart
.
START
END
YES
NO
NO
YES
MALFUNCTION
GOOD
TIME HAVE PASSED
AFTER STARTING?*
ENGINE COOLANT TEMP.
>=77˚C (171˚F)
*: See DTC SET CONDITIONS-JUDGMENT CRITERIA
MONITORING
CONDITIONS?
NO
YES
AK204044
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-188
Check Conditions
• Engine coolant temperature is between −10°C
(14
°F) and 77°C (171°F) when the engine is
started.
• The engine coolant temperature − intake air tem-
perature is 5
°C (9°F) or less when the engine is
started.
• The intake air temperature when the engine is
started
− intake air temperature is 5°C (9°F) or
less.
• The total time of the mass airflow sensor output
whose state is below 10 g/sec within 600 sec-
onds.
Judgment Criteria
• The time for the engine coolant temperature to
rise to 77
°C (171°F) takes longer than approxi-
mately 11 to 32 minutes.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• The thermostat is faulty.
• PCM failed.
DIAGNOSIS
STEP 1. Check the cooling system.
Refer to GROUP 14, Engine Cooling Diagnosis
Q: Is the cooling system normal?
YES : Replace the PCM. Then check that the DTC P0128
does not reset.
NO : Repair it. Then check that the DTC P0128 does not
reset.
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