Mitsubishi Galant (2004+). Manual — part 854
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-233
STEP 10. Check for harness damage between cylinder 1, 4
injector connector and PCM connector.
a. Check the harness wire between injector connector B-01
(terminal No. 2) and PCM connector B-23 (terminal No.
153) when checking No. 1 cylinder.
b. Check the harness wire between injector connector B-27
(terminal No. 2) and PCM connector B-23 (terminal No.
139) when checking No. 4 cylinder.
Q: Is the harness wire in good condition?
YES : Go to Step 11.
NO : Repair it. Then go to Step 12.
STEP 11. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Replace the PCM. Then go to Step 12.
NO : Repair it. 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 P0134 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
M
1
2
AK303822
B-01 (GR)
B-27 (GR)
CONNECTORS: B-01, B-27
AB
HARNESS CONNECTOR:
COMPONENT SIDE
127 126 125 124 123 122 121
133 132 131 130 129 128
140 139 138 137 136 135 134
146 145 144 143 142 141
153 152 151 150 149 148 147
AK303058
HARNESS CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-23
B-23
PCM
AB
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-234
DTC P0135: Cylinder 1, 4 Heated Oxygen Sensor Heater Circuit (sensor 1)
1
2
3
4
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
AK303823
1
2
3
4
TO PCM TO PCM
RED-
WHITE
RED
RED-WHITE
WHITE-BLA
CK
CYLINDER 1, 4 HEATED
OXYGEN SENSOR (FRONT)
B-17X
1
2
3
4
BATTERY
1
3
2
4
126
MFI
RELAY
B-37
MU802665
POWERTRAIN
CONTROL
MODULE (PCM)
Cylinder 1, 4 Heated Oxygen Sensor (front) Heater Circuit
B-23
RED-
WHITE
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-235
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 4) to the cylinder 1, 4 heated oxygen sensor
(front) heater.
• The PCM (terminal No. 126) controls continuity to
the cylinder 1, 4 heated oxygen sensor (front)
heater by turning the power transistor in the PCM
"ON" and "OFF".
.
TECHNICAL DESCRIPTION
• The PCM checks whether the heater current is
within a specified range when the heater is ener-
gized.
.
DESCRIPTIONS OF MONITOR METHODS
Cylinder 1, 4 heated oxygen sensor heater (front)
current is out of specified range when engine
coolant temperature is over 20
°C (68°F).
.
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)
• Engine coolant temperature sensor
.
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
AK303820AB
CONNECTOR: B-37
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
B-37 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-236
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the cylinder 1, 4 heated oxygen sensor
(front) heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgment Criteria
• The cylinder 1, 4 heated oxygen sensor (front)
heater current has continued to be lower than
0.16 ampere or higher than 7.5 ampere for 4 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:)
• Open or shorted cylinder 1, 4 heated oxygen sen-
sor (front) heater circuit, harness damage or con-
nector damage.
• Open circuit in cylinder 1, 4 heated oxygen sen-
sor (front) heater.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT
< 0.16A
CURRENT
> 7.5A
AK302023
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