Mitsubishi Outlander GS45X. Manual - part 729

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-739

STEP 10. Check for harness damage between injector 
relay connector and injector connector.
NOTE: Check harness after checking intermediate connector 
A-13. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then confirm that the malfunction symptom is eliminated.

a. Injector relay connector A-24X (terminal No. 3) and No. 1 

cylinder injector connector B-101 (terminal No. 1).

b. Injector relay connector A-24X (terminal No. 3) and No. 2 

cylinder injector connector B-120 (terminal No. 1).

c. Injector relay connector A-24X (terminal No. 3) and No. 3 

cylinder injector connector B-103 (terminal No. 1).

d. Injector relay connector A-24X (terminal No. 3) and No. 4 

cylinder injector connector B-116 (terminal No. 1).

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

STEP 11. Check harness connector B-10 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 12.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 12. Check for open circuit and short circuit to 
ground and harness damage between injector connector 
and ECM connector.

a. No. 1 cylinder injector connector B-101 (terminal No. 2) and 

ECM connector B-10 (terminal No. 2).

b. No. 2 cylinder injector connector B-120 (terminal No. 2) and 

ECM connector B-10 (terminal No. 3).

c. No. 3 cylinder injector connector B-103 (terminal No. 2) and 

ECM connector B-10 (terminal No. 18).

d. No. 4 cylinder injector connector B-116 (terminal No. 2) and 

ECM connector B-10 (terminal No. 19).

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-740

STEP 13. Check the ignition system.
(1) Connect the timing light to terminal No. 3 of the ignition coil 

connector B-01, B-19, B-04 or B-18 in order.

(2) Crank the engine.

• The timing light flashes.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the timing light flash?

YES : Go to Step 14.
NO :  Refer to Inspection procedure 25 

− Ignition circuit 

system 

P.13A-807

.

STEP 14. 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 15.

STEP 15. Check the ignition coil.
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 16.

STEP 16. Check the compression pressure.
Refer to GROUP 11A, On-vehicle Service 

− Compression 

Pressure Check 

P.11A-18

.

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 injectors are clogged.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-741

Inspection procedure 7: Unstable idle (rough idle, hunting)

.

COMMENT

• In cases such as the above, the cause is proba-

bly the air/fuel mixture. Other systems affecting 
idle quality include the ignition system and com-
pression.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:)

• Malfunction of the fuel pump system.

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor compression

• Malfunction of the purge control system

• Malfunction of the EGR system

• Improper operation of the PCV valve.

• Malfunction of the charging system.

• Vacuum leak.

• Contaminated fuel.

• Malfunction of variable valve timing control 

(MIVEC) 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

• MB992110: Power Plant ECU Check Harness

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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-742

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 is 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.13A-49

.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check following items in the actuator test. Refer to Actuator 

Test Reference Table 

P.13A-838

.

a. Item 1: Injector.
b. Item 10: Evaporative emission purge solenoid

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?

YES : Go to Step 4.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector