Mitsubishi Galant (2004+). Manual — part 1197
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-481
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 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
.
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 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0201 set?
YES : Repeat the troubleshooting.
NO : The procedure 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-482
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.
AK302850
RED-
WHITE
YELLO
W
-RED
RED
RED-
WHITE
RED-
WHITE
146
B-17X
POWERTRAIN CONTROL
MODULE (PCM)
1
2
INJECTOR
NO. 2
B-30
MFI
RELAY
BATTERY
4
3
1
2
B-23
2
1
Injector Circuit - Cylinder 2
3 4
1 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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-483
.
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-484
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine is running.
Judgment Criteria
• Injector coil surge voltage (battery positive volt-
age + 2 volts) has not been detected for 2 sec-
onds.
.
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:)
• No. 2 cylinder injector failed.
• Open or shorted No. 2 cylinder injector circuit,
harness damage, or connector damage.
• PCM failed.
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
CONTINUOUS
FAILURE FOR 2secs
INJ. SURGE V < V
B
+ 2.0 V
AK204052
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст