Mitsubishi Outlander GS45X. Manual — part 964
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-789
STEP 1. Check if the EGR valve sounds during
initialization.
Q: Is the initialization sound heard in the EGR valve?
YES : Go to Step 2.
NO : Refer to GROUP 17, Emission Control
− Exhaust Gas
Recirculation (EGR) System
− EGR Valve (Stepper
Motor) 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 any DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Refer to Actuator Test Reference Table
.
a. Item 1: Injector.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are thy operating properly?
YES : Go to Step 4.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 4. Check the ignition timing.
(1) Refer to GROUP 11C, On-vehicle Service
− Ignition Timing
Q: Is the ignition timing normal?
YES : Go to Step 5.
NO : Check for installed conditions of the timing belt. Then
confirm that the malfunction symptom is eliminated.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-790
STEP 5. Using scan tool MB991958, check data list and
actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List
.
a. Item 5: Intake Air Temperature Sensor.
b. Item 6: Engine Coolant Temperature Sensor.
c. Item 13: Throttle Position Sensor (main).
d. Item 15: Throttle Position Sensor (sub).
e. Item 11: Accelerator Pedal Position Sensor (main).
f. Item 12: Accelerator Pedal Position Sensor (sub).
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?
YES : Go to Step 6.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 6. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Go to Step 7.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 7. Check the spark plugs.
Refer to GROUP 16, Ignition System
− On-vehicle Service −
Spark Plug Check And Cleaning
.
Q: Are there any abnormalities?
YES : Replace the spark plug. Then confirm that the
malfunction symptom is eliminated.
NO : Go to Step 8.
STEP 8. Check the ignition coil.
(1) Remove the intake manifold.
(2) Refer to GROUP 16, Ignition System
− On-vehicle Service
− Ignition Coil Check
.
Q: Are there any abnormalities?
YES : Replace the ignition coil. Then confirm that the
malfunction symptom is eliminated.
NO : Go to Step 9.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-791
STEP 9. Check the positive crankcase ventilation valve.
Refer to GROUP 17, Emission Control
− Positive Crankcase
Ventilation System
− Positive Crankcase Ventilation System
Check
.
Q: Is the positive crankcase ventilation valve?
YES : Check the following items, and repair or replace the
defective items.
a. Vacuum leak.
b. Clogged air cleaner.
c. Clogged exhaust system.
d. Check if fuel is contaminated.
e. Check if the injectors are clogged.
f. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
g. Increased resistance to the transmission drive
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
INSPECTION PROCEDURE 15: Acceleration shock.
.
COMMENT
• There may be an ignition leak accompanying the
increase in the spark plug demand voltage during
acceleration.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the ignition system.
• Malfunction of the ECM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-792
STEP 1. 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 any DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 2.
STEP 2. Check the spark plugs.
Refer to GROUP 16, Ignition System
− On-vehicle Service −
Spark Plug Check And Cleaning
.
Q: Are there any abnormalities?
YES : Replace the spark plug. Then confirm that the
malfunction symptom is eliminated.
NO : Go to Step 3.
STEP 3. Check the ignition coil.
(1) Remove the intake manifold.
(2) Refer to GROUP 16, Ignition System
− On-vehicle Service
− Ignition Coil Check
.
Q: Are there any abnormalities?
YES : Replace the ignition coil. Then confirm that the
malfunction symptom is eliminated.
NO : Check for occurrence of ignition leak. Then confirm
that the malfunction symptom is eliminated.
INSPECTION PROCEDURE 16: Knocking
.
COMMENT
• Incases 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.
• Poor compression.
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
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