Mitsubishi Galant 9G. Manual — part 973
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-192
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 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0125 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
1
2
AK303037
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-104
AB
B-104 (B)
THROTTLE
BODY
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) <3.8L ENGINE>
13B-193
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) <3.8L ENGINE>
13B-194
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 15g/sec within 300seconds.
Judgment Criteria
• The time for the engine coolant temperature to
rise to 77
°C (171°F) takes longer than approxi-
mately 7 to 16 minutes.
• The PCM monitors for this condition once during
the drive cycle.
.
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 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.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-195
DTC P0130: Heated Oxygen Sensor Circuit (bank 1, sensor 1)
.
BLA
CK
BLUE
BLA
CK
TO PCM
FROM MFI RELAY
PINK
AK400900
69
92
4
3
1
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
B-09
MU802605
2
B-22
Right Bank Heated Oxygen Sensor (front) Circuit
B-21
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
1
2
3
4
AK303047
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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