Mitsubishi Galant (2004+). Manual — part 1089
![](/vehicles/winoney/jucether/peds/yond.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-49
STEP 7. Check for harness damage between mass airflow
sensor connector B-10 (terminal No. 3) and PCM connector
B-22 (terminal No. 108).
Q: Is the harness wire in good condition?
YES : Go to Step 8.
NO : Repair it. Then go to Step 9.
STEP 8. Replace the mass airflow sensor.
(1) Replace the mass airflow sensor.
(2) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(3) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?
YES : Replace the PCM. Then go to Step 9.
NO : The inspection is complete.
AK303015
2
1
3
4
AB
B-10 (GR)
CONNECTOR: B-10
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
AK303015
2
1
3
4
AB
B-10 (GR)
CONNECTOR: B-10
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-50
STEP 9. 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 P0101 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
![](/vehicles/winoney/jucether/peds/znouf.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-51
DTC P0102: Mass Airflow Circuit Low In put
CAUTION
If DTC P0102 has been set, TCL related DTC
U1120 is also set. After P0102 has been diag-
nosed, don't forget to erase DTC U1120.
RED
RED-
WHITE
RED-
WHITE
RED-
WHITE
AK302832
B-10
B-17X
MFI
RELAY
BATTERY
MASS AIRFLOW
SENSOR
2
1
2
4
3
Mass Airflow Sensor Circuit
1
2
3
4
1
2
3 4
WHITE-GREEN
BLA
CK
POWERTRAIN CONTROL
MODULE (PCM)
108
3
69
4
B-22
B-21
HEAT
SENSITIZING
RESISTANCE
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
![](/vehicles/winoney/jucether/peds/lorisof.png)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-52
.
CIRCUIT OPERATION
• The mass airflow sensor power is supplied from
the MFI relay (terminal No. 4), and the ground is
provided on the PCM (terminal No. 69).
• 5-volt power is applied to the mass airflow sensor
output terminal (terminal No. 3) from the PCM
(terminal No. 108).
.
TECHNICAL DESCRIPTION
• While the engine is running, the mass airflow
sensor outputs voltage which corresponds to the
mass airflow rate.
• The PCM checks whether the voltage output by
the mass airflow sensor while the engine is run-
ning is within a specified range.
.
DESCRIPTIONS OF MONITOR METHODS
Mass airflow sensor output voltage is out of specified
range.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
AK303014
CONNECTOR: B-17X
MFI RELAY
MFI RELAY
FRONT OF VEHICLE
B-17X
AB
AK303012
CONNECTOR: B-10
MASS AIRFLOW SENSOR
AB
B-10 (GR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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