Mitsubishi Galant (2004+). Manual — part 990
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-777
STEP 2. Measure the 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.
(2) Start the engine and run at idle.
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) <2.4L ENGINE>
13A-778
(3) Measure the voltage between terminal No. 131 and ground.
NOTE: Vehicle for Canada, the headlight, taillight, etc.
remain lit even when the lighting switch is in "OFF" position
but this is no problem for checks.
a. Engine: warming up
b. Radiator fan: stopped
c. Headlight switch: OFF to ON
d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON
• Voltage should be drop.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Did the measured voltage drop?
YES : Go to Step 3.
NO : Go to Step 4.
STEP 3. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0622 set?
YES : Replace the PCM. Then go to Step 8.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
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
AK203297
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
AB
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-779
STEP 4. Check harness connector B-116 at generator
connector for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 8.
STEP 5. Measure the voltage at generator harness side
connector B-116.
(1) Disconnect the connector B-116 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 and ground.
• Voltage should measure 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 : Go to Step 6.
AK303884
2
1
3
4
AB
CONNECTOR: B-116
B-116 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303884
2
1
3
4
AB
CONNECTOR: B-116
B-116 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000263
B-116 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AK
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-780
STEP 6. Check for open circuit and short circuit to ground
between generator connector B-116 (terminal No. 4) and
PCM connector B-23 (terminal No. 131).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 8.
NO : Repair it. Then go to Step 8.
AK303884
2
1
3
4
AB
CONNECTOR: B-116
B-116 (GR)
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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