Mitsubishi Outlander GS45X. Manual — part 965
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-793
• 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
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 any DTC set?
YES : Refer to Diagnostic Trouble Code Chart
.
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of the data list. Refer to Data List
.
a. Item 32: Knock retard.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 3.
NO : Refer to DTC P0327
− Knock Sensor Circuit Low
(Bank 1)
, DTC P0328
− Knock Sensor
Circuit High (Bank 1)
, DTC P0332
− Knock
, DTC P0333
− Knock Sensor Circuit High (Bank 2)
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-794
STEP 3. 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 4.
STEP 4. Check the compression pressure.
Refer to GROUP 11C, On-vehicle Service
− Compression
Pressure Check
Q: Is the compression pressure normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check if fuel is contaminated.
b. Check if the foreign materials (water,
kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
INSPECTION PROCEDURE 17: Too high CO and HC concentration when idling
.
COMMENT
• Abnormal air/fuel ratio is suspected.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the fuel pump system.
• Malfunction of the ignition system.
• Poor compression.
• Malfunction of the EGR system.
• Improper operation of the PCV valve.
• 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
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-795
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. Check the ignition timing.
Refer to GROUP 11C, On-vehicle Service
− Ignition Timing
Check
.
Q: Is the ignition timing normal?
YES : Go to Step 4.
NO : Check for installed conditions of the timing belt. 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
.
a. Item 6: Engine Coolant Temperature Sensor.
b. Item 5: Intake Air Temperature Sensor.
(3) 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. Check the fuel pressure.
Refer to On-vehicle Service
− Fuel Pressure Test
Q: Is the fuel pressure normal?
YES : Go to Step 6.
NO : Repair or replace it. 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-796
STEP 6. 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 7.
STEP 7. 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 8.
STEP 8. Check the compression pressure.
Refer to GROUP 11C, On-vehicle Service
− Compression
Pressure Check
Q: Is the compression pressure normal?
YES : Go to Step 9.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
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 : Go to Step 10.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
STEP 10. Check the purge control system.
Refer to GROUP 17, Emission Control
− Evaporative Emission
Control System
− Purge Control System Check (Purge Flow
Check)
Q: Is the purge control system normal?
YES : Check the following items, and repair or replace the
defective items.
a. Check if the injectors are clogged.
Then confirm that the malfunction symptom is
eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
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