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 

P.17-81

.

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 

P.13B-50

.

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 

P.13B-858

.

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 

Check 

P.11C-13

.

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 

Reference Table 

P.13B-836

.

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 

P.13B-883

.

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 

P.16-45

.

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 

P.16-44

.

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 

P.17-74

.

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 

P.13B-50

.

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 

P.16-45

.

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 

P.16-44

.

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