Mitsubishi Galant (2004+). Manual - part 1046

 

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Mitsubishi Galant (2004+). Manual - part 1046

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1001

STEP 2. Check the ignition timing. 
(1) The ignition timing should retard more when knock sensor 

connector B-120 is disconnected than when it is connected.

Q: When the knock sensor connector B-120 was 

disconnected, was the ignition timing delayed? 
YES : 
Check the following items, and repair or replace the 

defective items.

a. Check the spark plugs.
b. Fuel quality, octane level.

c. Check if the foreign materials (water, 

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Refer to DTC P0325 

− Knock Sensor Circuit 

P.13A-534

.

INSPECTION PROCEDURE 21: Dieseling (Run-on).

.

COMMENT

• Fuel leakage from injectors is suspected, or car-

bon build up.

.

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

• Fuel leakage from injectors.

DIAGNOSIS

STEP 1. Check the injectors for fuel leakage.
Replace the leaking injector. Then confirm that the malfunction 

symptom is eliminated.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1002

INSPECTION PROCEDURE 22: 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 air/fuel ratio control system.

• Deteriorated catalyst.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

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 the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-34

.

NO :  Go to Step 2.

STEP 2. Check the ignition timing.
Refer to GROUP 11A, On-vehicle Service 

− Ignition Timing 

Check 

P.11A-12

.

Q: Is the ignition timing normal?

YES : Go to Step 3.
NO :  Check that the crankshaft position sensor and timing 

belt cover are in the correct position. Then confirm 
that the malfunction symptom is eliminated.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1003

STEP 3. Using scan tool MB991958, check data list.

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) Check the following items in the data list. Refer to Data List 

Reference Table 

P.13A-1063

.

a. Item 21: Engine Coolant Temperature Sensor.
b. Item 13: Intake Air Temperature Sensor.

c. Item 25: Barometric Pressure Sensor.

d. Item 69: Cylinder 1, 4 Heated Oxygen Sensor (rear).
e. Item 39: Cylinder 1, 4 Heated Oxygen Sensor (front).

f. Item 59: Cylinder 2, 3 Heated Oxygen Sensor (rear).

g. Item 11: Cylinder 2, 3 Heated Oxygen Sensor (front). 

(4) 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 of the data list. Refer to Data List 

Reference Table 

P.13A-1063

.

a. Item 39: Cylinder 1, 4 Heated Oxygen Sensor (front).
b. Item 11: Cylinder 2, 3 Heated Oxygen Sensor (front).

• Voltage should fluctuate between 0 − 0.4 volt and 0.6 − 

1.0 volt while idling after the engine has been warmed.

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

YES : Replace the heated oxygen sensor (front). Then 

confirm that the malfunction symptom is eliminated. If 
not resolved, go to step 6.

NO :  Go to Step 5.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1004

STEP 5. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13A-1104

.

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 following items.
(1) Check the following items, and repair or replace the 

defective items.

a. Check the injectors for fuel leakage.
b. Check the ignition coil and spark plugs.

c. Check compression pressure.

d. Check the positive crank case ventilation system.
e. Check the evaporative emission system.

f. Check the EGR system.

(2) Then check the malfunction symptom.
Q: Is the malfunction symptom eliminated?

YES : The check is completed.
NO :  Replace the catalytic converter. Then confirm that the 

malfunction symptom is eliminated. 

 

 

 

 

 

 

 

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