Mitsubishi Galant (2004+). Manual — part 1234
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-629
STEP 2. Measure the EGR valve motor coil resistance.
(1) Disconnect the EGR valve connector B-105.
(2) Measure the resistance between EGR valve connector
terminal No. 2 and either terminal No. 4 or terminal No. 6.
Standard value: 20
− 24 ohms [at 20°C (68°F)]
(3) Measure the resistance between EGR valve connector
terminal No. 5 and either terminal No. 1 or terminal No. 3.
Standard value: 20
− 24 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 20 and 24 ohms [at
20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the EGR valve. Then go to Step 12.
1
2 3
4
5 6
AK303137AB
B-105(GR)
CONNECTOR: B-105
EGR
VALVE
BRAKE FLUID
RESERVOIR
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2 3
4
5 6
1
2 3
4
5 6
AK202951
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-630
STEP 3. Measure the power supply voltage at EGR valve
motor harness side connector B-105.
(1) Disconnect the connector B-105 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2, No. 5 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 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-17X at MFI relay for
damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MFI relay connector
B-17X (terminal No. 4) and EGR valve connector
B-105 (terminal No. 2, No. 5) because of open circuit
or short circuit to ground. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
1
2 3
4
5 6
AK303137AB
B-105(GR)
CONNECTOR: B-105
EGR
VALVE
BRAKE FLUID
RESERVOIR
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
6
AK303139
B-105 HARNESS
CONNECTOR:
CONPONENT SIDE
AB
1
2
3
4
AK303017
CONNECTOR: B-17X
FRONT OF VEHICLE
B-17X
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
RELAY BOX
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-631
STEP 5. Measure the power supply voltage at PCM
connector B-23 by using power plant ECU check harness
special tool MB991923.
(1) Disconnect the all PCM connectors and connect power
plant ECU check harness special tool MB991923 between
the separated connectors.
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
AK202954
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
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-632
(2) Measure the voltage between terminal (No. 124, No. 130,
No. 136, No. 142) and ground.
• The voltage should be between 5 and 8 volts for approx-
imately 3 seconds when the Ignition switch is turned
from the "LOCK" (OFF) position to the "ON" position.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 8.
NO : Go to Step 6.
STEP 6. Check harness connector B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
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
AK202955AB
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
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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