Mitsubishi Galant 9G. Manual — part 885
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-982
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should remain greater than 8 volts while the
engine is cranked.
Q: Does the voltage remain greater than 8 volts while the
engine is cranked?
YES : Go to Step 2.
NO : Refer to GROUP 54A, Battery
− Battery check
STEP 2. 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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 3.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-983
STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to
a. Item 07: Fuel Pump.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?
YES : Go to Step 4.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List
Reference Table
.
a. Item 21: Engine Coolant Temperature Sensor.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 5.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-984
STEP 5. Inspection of throttle body (throttle valve area) for
dirtiness.
Q: Is the throttle valve area dirty?
YES : Refer to On-vehicle Service
− Throttle Body (Throttle
Valve Area) Cleaning
NO : Go to Step 6.
STEP 6. Check the ignition timing.
(1) Check the ignition timing at cranking.
Standard value: 5
° BTDC ± 3°
Q: Is the ignition timing normal?
YES : Go to Step 7.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
STEP 7. Check harness connector B-01 or B-03 or B-27 or
B-30 at injector for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then confirm that the
malfunction symptom is eliminated.
STEP 8. Check the injector.
(1) Disconnect the injector connector B-01, B-03, B-27 and
B-30.
(2) Measure the resistance between each injector side
connector terminal No. 1 and No. 2.
Standard value: 10.5
− 13.5 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 10.5 and 13.5 ohms
[at 20
°C (68°F)]?
YES : Go to Step 9.
NO : Repair the injector. Then confirm that the malfunction
symptom is eliminated.
M
1
2
AK303920
B-01 (GR)
B-03 (GR)
B-30 (GR)
B-27 (GR)
CONNECTORS: B-01, B-03, B-27, B-30
HARNESS CONNECTOR:
COMPONENT SIDE
AB
M
1
2
AK303920
B-01 (GR)
B-03 (GR)
B-30 (GR)
B-27 (GR)
CONNECTORS: B-01, B-03, B-27, B-30
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-985
STEP 9. Check harness connector B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then confirm that the
malfunction symptom is eliminated.
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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