Mitsubishi Outlander GS45X. Manual - part 960

 

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Mitsubishi Outlander GS45X. Manual - part 960

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-773

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 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

.

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.13B-50

.

NO :  Go to Step 3.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-774

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.13B-858

.

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.

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 

Reference Table 

P.13B-836

.

a. Item 5: Intake Air Temperature Sensor.
b. Item 6: Engine Coolant Temperature Sensor.

c. Item 10: Mass Airflow Sensor

d. Item 76: A/C Switch

(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 

P.13B-883

.

Q: Is the fuel pressure normal?

YES : Go to Step 6.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 6. Check the ignition timing.
Refer to GROUP 11C, On-vehicle Service 

− Ignition Timing 

Check 

P.11C-13

.

Q: Is the ignition timing normal?

YES : Go to Step 7.
NO :  Check for installed conditions of the timing belt. Then 

confirm that the malfunction symptom is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-775

STEP 7. Measure the voltage at ECM connector B-10 by 
using check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the check 

harness special tool MB992110 between the separated 
connectors.

(2) Start the engine and run at idle.

NOTE: Vehicles for Canada, the headlight, taillight, etc. 
remain lit even when the lighting switch is in "OFF" position 
but this is no problem for checks.

(3) Measure the voltage between terminal No. 60 and ground.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

• Voltage rises.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the harness measured voltage within the specified 

range?
YES : 
Go to Step 8.
NO :  Replace the generator. Then confirm that the 

malfunction symptom is eliminated.

STEP 8. 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 9.

STEP 9. 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 10.

AK700249

ECM

AB

Body side harness 

MB992110

AK700207

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

Special tool 64-pin 
connector:
component side 

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-776

STEP 10. Check the compression pressure.
Refer to GROUP 11C, On-vehicle Service 

− Compression 

Pressure Check 

P.11C-18

.

Q: Is the compression pressure normal?

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

is eliminated.

STEP 11. 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 : Go to Step 12.
NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

STEP 12. Check the purge control system.
Refer to GROUP 17, Emission Control 

− Evaporative Emission 

Control System 

− Purge Control System Check (Purge Flow 

Check) 

P.17-77

.

Q: Is the purge control system normal?

YES : Check the following items, and repair or replace the 

defective items.

a. Vacuum leak.
b. Check if fuel is contaminated.

c. 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.

INSPECTION PROCEDURE 8: Idle speed is high (improper idle speed).

.

COMMENT

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

bly that the intake air volume during idle is too 
great.

.

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

• Malfunction of the engine coolant temperature 

sensor signal.

• Malfunction of the accelerator pedal position sen-

sor (main) signal.

• Malfunction of the accelerator pedal position sen-

sor (sub) signal.

• Malfunction of the A/C switch signal.

• Malfunction of the power steering pressure switch 

signal.

• Malfunction of the purge control system.

• Malfunction of the ECM.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

 

 

 

 

 

 

 

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