Mitsubishi Galant 9G. Manual — part 1045
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-480
STEP 11. 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 P0183 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-481
DTC P0201: Injector Circuit Malfunction - Cylinder 1
CAUTION
If DTC P0201 has been set, TCL related DTC
U1120 is also set. After P0201 has been diag-
nosed, don't forget to erase DTC U1120.
AK400907
YELLO
W
-
BLUE
YELLO
W
-
BLUE
RED
RED
RED-
WHITE
RED-
WHITE
BATTERY
B-17X
INJECTOR
NO. 1
1
2
153
5
9
POWERTRAIN CONTROL
MODULE (PCM)
B-32
MU802645
B-23
B-01
(MU802062)
2
1
Injector Circuit - Cylinder 1
1
2 3
6
7 8
4 5
9 10
121 122 123 124 125 126 127
128 129 130 131 132 133
134 135 136 137 138 139 140
141 142 143 144 145 146
147 148 149 150 151 152 153
1
2
3
4
MFI
RELAY
TO PCM
1
2
3
4
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-482
.
CIRCUIT OPERATION
• The injector power is supplied from the MFI relay
(terminal No. 4).
• The PCM controls the injector by turning the
power transistor in the PCM "ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is con-
trolled by the amount of continuity time the coil is
grounded by the PCM.
• A surge voltage is generated when the injectors
are driven and the current flowing to the injector
coil is shut off.
• The PCM checks this surge voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after injector is operated.
.
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
.
AK303096
CONNECTOR: B-01
AB
B-01 (GR)
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
AK303097
CONNECTOR: B-32
AB
B-32 (B)
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-483
DTC SET CONDITIONS <Circuit continuity
− open circuit and shorted low>
Logic Flow Chart
.
Check Conditions
• Engine is running.
Judgment Criteria
• The supply voltage is 3 volts or less without the
injector driving.
.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
INJ. SURGE V
<= 3 V
AK401614
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