Mitsubishi Galant 9G. Manual — part 1048
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-492
STEP 11. Using the oscilloscope, check the No. 1 cylinder
injector.
(1) Disconnect the intermediate connector B-32 and connect
the test harness MB991658 between the separated
connectors.
(2) Connect the oscilloscope probe to injector intermediate
connector terminal to No.5.
NOTE: When measuring with the PCM side connector, dis-
connect the all PCM connectors and connect check har-
ness special tool (MB991923) between the separated
connectors. Then connect an oscilloscope probe to the
check harness connector terminal No.153.
(3) Start the engine and run at idle.
(4) Measure the waveform.
• The waveform should show a normal pattern similar to
the illustration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : It can be assumed that this malfunction is intermittent.
Refer to 00, How to Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
.
NO : Replace the PCM. Then go to Step 12.
STEP 12. 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 P0201 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
1
2 3
6
7 8
4 5
9 10
AK203300
OSCILLOSCOPE
MB991658
B-32 INTERMEDIATE
CONNECTOR
AB
AKX01557 AB
A
NORMAL WAVEFORM
A:INJECTOR DRIVE TIME
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-493
DTC P0202: Injector Circuit Malfunction - Cylinder 2
CAUTION
If DTC P0202 has been set, TCL related DTC
U1120 is also set. After P0202 has been diag-
nosed, don't forget to erase DTC U1120.
AK400908
YELLO
W
-RED
RED
146
POWERTRAIN CONTROL
MODULE (PCM)
1
2
INJECTOR
NO. 2
1
B-23
Injector Circuit - Cylinder 2
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
2
3
4
MFI
RELAY
TO PCM
RED-
WHITE
RED-
WHITE
BATTERY
B-17X
1
2
3
4
B-30
(MU802062)
2
1
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-494
.
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
.
AK303102
CONNECTOR: B-30
B-30 (GR)
AB
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
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-495
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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