Mitsubishi Galant (2004+). Manual — part 1045
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-997
STEP 2. Using scan tool MB991958, check actuator test
items 01, 02, 03, 04: Injector.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to Actuator
Test Reference Table
a. Item 01, 02, 03, 04: Injector.
(3) Turn the ignition switch to the "ON" position.
Q: Are they operating properly?
YES : Go to Step 3.
NO : Refer to DTC P0201
− Injector Circuit-cylinder 1
− Injector Circuit-cylinder 2
− Injector Circuit-cylinder 3
− Injector Circuit-cylinder 4
STEP 3. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service
− Ignition Timing
Check
Q: Is the ignition timing normal?
YES : Go to Step 4.
NO : Check that the crankshaft position sensor and timing
belt cover are in the correct position. Then confirm
that the malfunction symptom is eliminated.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-998
STEP 4. Using scan tool MB991958, check data list.
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) Check the following items in the data list. Refer to Data List
Reference Table
a. Item 13: Intake Air Temperature Sensor.
b. Item 25: Barometric Pressure Sensor.
c. Item 21: Engine Coolant Temperature Sensor.
d. Item 69: Cylinder 1, 4 Heated Oxygen Sensor (rear).
e. Item 39: Cylinder 1, 4 Heated Oxygen Sensor (front).
f. Item 59: Cylinder 2, 3 Heated Oxygen Sensor (rear).
g. Item 11: Cylinder 2, 3 Heated Oxygen Sensor (front).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 5.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 5. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of data list. Refer to Data List
Reference Table
a. Item 39: Cylinder 1, 4 Heated Oxygen Sensor (front).
b. Item 11: Cylinder 2, 3 Heated Oxygen Sensor (front).
• Voltage should fluctuate between 0 − 0.4 volt and 0.6 −
1.0 volt while idling after the engine has been warmed.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 7.
NO : Go to Step 6.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-999
STEP 6. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Vacuum leak.
• Broken intake manifold gasket.
• Broken air intake hose.
• Broken vacuum hose.
• Positive crankcase ventilation valve does
not operate.
b. Injector clogged.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 7. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check the ignition coil and spark plugs.
b. Check the EGR system.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1000
INSPECTION PROCEDURE 20: Knocking
.
COMMENT
• Incase such as the above, the cause is probably
that the detonation control is defective or the heat
value of the spark plug is inappropriate.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Defective knock sensor.
• Incorrect heat value of the spark plug.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using the 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 2.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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