Mitsubishi Galant 9G. Manual — part 698
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-234
STEP 8. Check harness connector B-22, B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 11.
AK303057
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
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
CONNECTORS: B-22, B-23
B-22 (B)
AB
B-23
B-22 HARNESS CONNECTOR:
COMPONENT SIDE
B-23 HARNESS CONNECTOR:
COMPONENT SIDE
PCM
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-235
STEP 9. Check for harness damage between cylinder 1, 4
heated oxygen sensor (front) connector B-37 (terminal No.
4) and PCM connector B-22 (terminal No. 92).
Q: Is the harness wire in good condition?
YES : Go to Step 10.
NO : Repair it. Then go to Step 11.
AK303821
1
2
3
4
AB
CONNECTOR: B-37
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
B-37 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-236
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 −
(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-237
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
AK400879
1
2
3
4
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
TO PCM
TO PCM TO PCM
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
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