Mitsubishi Galant 9G. Manual — part 711
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-286
STEP 4. 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 4 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0141: Cylinder 1, 4 Heated Oxygen Sensor Heater Circuit (sensor 2)
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
AK400880
RED-
WHITE
RED
RED-WHITE
BR
O
WN-BLA
CK
CYLINDER 1, 4 HEATED
OXYGEN SENSOR (REAR)
B-17X
1
2
3
4
BATTERY
1
3
2
4
138
MFI
RELAY
B-38
MU802605
POWERTRAIN
CONTROL
MODULE (PCM)
Cylinder 1, 4 Heated Oxygen Sensor (rear) Heater Circuit
B-23
RED-
WHITE
1
2
3
4
TO PCM
TO PCM TO PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-287
.
CIRCUIT OPERATION
• Power is supplied from the MFI relay (terminal
No. 4) to the cylinder 1, 4 heated oxygen sensor
(rear) heater.
• The PCM (terminal No. 138) controls continuity to
the cylinder 1, 4 heated oxygen sensor (rear)
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 (rear) cur-
rent 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
.
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
AK303825AB
CONNECTOR: B-38
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
B-38 (B)
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-288
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
(rear) heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgment Criteria
• The cylinder 1, 4 heated oxygen sensor (rear)
heater current has continued to be lower than
0.16 ampere or higher than 5.0 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 (rear) heater circuit, or harness damage.
• Open circuit in cylinder 1, 4 heated oxygen sen-
sor (rear) heater.
• Cylinder 1, 4 heated oxygen sensor (rear) failed.
• Connector damage.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT < 0.16A
CURRENT > 5.0A
AK302027
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-289
DIAGNOSIS
Required Special Tools:
• MD998464: Test Harness
• MB991923: Power Plant ECU Check Harness
STEP 1. Check harness connector B-38 at the cylinder 1, 4
heated oxygen sensor (rear) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 12.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
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