Mitsubishi Galant 9G. Manual — part 849
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-838
STEP 6. Measure the power supply voltage at PCM harness
side connector B-23.
(1) Disconnect the connector B-23 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 123 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 7.
NO : Repair harness wire between throttle actuator control
motor relay connector B-14X (terminal No. 3) and
PCM connector B-23 (terminal No. 123) because of
open circuit or short circuit to ground. Then go to Step
14.
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
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
AK303889AB
B-23 HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-839
STEP 7. Measure the power supply voltage at PCM harness
side connector B-23.
(1) Disconnect the connector B-23 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 122 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 10.
NO : Go to Step 8.
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
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
AK303890AB
B-23 HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-840
STEP 8. Check for open circuit and short circuit to ground
between throttle actuator control motor relay connector
B-14X (terminal No. 4) and PCM connector B-23 (terminal
No. 122).
Q: Is the harness wire in good condition?
YES : Go to Step 9.
NO : Repair it. Then go to Step 14.
AK303887
2
1
3
4
AB
CONNECTOR: B-14X
B-14X
RELAY BOX
TRIANGLE
MARK
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-841
STEP 9. Check for harness damage between MFI relay
connector B-17X (terminal No. 4) and throttle actuator
control motor relay connector B-14X (terminal No. 2).
Q: Is the harness wire in good condition?
YES : Repair harness wire between throttle actuator control
motor relay connector B-14X (terminal No. 3) and
PCM connector B-23 (terminal No. 123) because of
harness damage. Then go to Step 14.
NO : Repair it. Then go to Step 14.
STEP 10. Check harness connector B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 14.
AK303806
2
1
3
4
AB
CONNECTOR: B-17X
B-17X
RELAY BOX
TRIANGLE
MARK
HARNESS CONNECTOR:
COMPONENT SIDE
AK303887
2
1
3
4
AB
CONNECTOR: B-14X
B-14X
RELAY BOX
TRIANGLE
MARK
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
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