Mitsubishi Galant 9G. Manual — part 939
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-56
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 −
(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.
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 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0101 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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-57
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.
1
2
3
4
1
2
3 4
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
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK400876
RED
WHITE-GREEN
BLA
C
K
RED-
WHITE
RED-
WHITE
B-10
B-17X
MFI RELAY
BATTERY
MASS AIRFLOW
SENSOR
HEAT
SENSITIZING
RESISTANCE
POWERTRAIN CONTROL
MODULE (PCM)
108
3
69
2
1
2
4
4
3
Mass Airflow Sensor Circuit
B-21
B-22
TO PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-58
.
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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-59
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 3 seconds or more have passed since the ignition
switch was turned to "ON" position.
Judgement Criteria
• Mass airflow sensor output voltage has continued
to be lower than 0.2 volt for 2 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Mass airflow sensor failed.
• Open or shorted mass airflow sensor circuit, or
connector damage.
• PCM failed.
END
MALFUNCTION
YES
YES
YES
NO
NO
NO
CONTINUOUS
FAILURE FOR 2secs
OUTPUT VOLTAGE
< 0.2V
OUTPUT VOLTAGE
> 4.9V
MONITORING
CONDITIONS
GOOD
START
AK302377
YES
NO
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