Mitsubishi Outlander GS45X. Manual — part 735

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-763

STEP 4. 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.

• 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

P.13A-49

.

NO : Go to Step 2.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-764

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

Reference Table

P.13A-818

.

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

Input

P.13A-364

, DTC P0328 - Knock Sensor Circuit

High Input

P.13A-368

.

STEP 3. 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 4.

STEP 4. 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 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 heated oxygen sensor.

• Malfunction of the ignition system.

• Poor compression.

• Malfunction of the EGR system.

• Improper operation of the PCV valve.

• Malfunction of the evaporative emission control

system.

• Malfunction of the ECM.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-765

• 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

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.13A-49

.

NO : Go to Step 3.

STEP 3. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service

− Ignition Timing

Check

P.11A-13

.

Q: Is the ignition timing normal?

YES : Go to Step 4.
NO : Check for installed conditions of the timing chain.

Then confirm that the malfunction symptom is
eliminated.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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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.13A-818

.

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

c. Item AD: Heated Oxygen Sensor (rear).

d. Item E1: Linear Air-fuel Ratio 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 Fuel Pressure Test

P.13A-868

.

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 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 7.

STEP 7. 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 8.

STEP 8. Check the compression pressure.
Refer to GROUP 11A, On-vehicle Service

− Compression

Pressure Check

P.11A-18

.

Q: Is the compression pressure normal?

YES : Go to Step 9.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.