Mitsubishi Montero (2004+). Manual - part 351

 

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Mitsubishi Montero (2004+). Manual - part 351

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-891

STEP 5. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items of data list. Refer to Data List 

Reference Table 

P.13A-950

.

a. Item 39: Right Bank Heated Oxygen Sensor (front).
b. Item 11: Left Bank Heated Oxygen Sensor (front).

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

1.0 volts while idling after the engine has been warmed.

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

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13A-995

.

Q: Is the fuel pressure normal?

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

defective items.
a.Vacuum leak.

•Broken intake manifold gasket.

•Broken air intake hose.

•Broken vacuum hose.

•Positive crankcase ventilation valve does not 

operate.

b.Injector clogged.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 7. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13A-995

.

Q: Is the fuel pressure normal?

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

defective items.
a.Check the ignition coil, spark plugs, spark plug 

cables.

b.Check the EGR system.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-892

INSPECTION PROCEDURE 20: Knocking

.

COMMENT

• Incase 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.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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 the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-26

.

NO :  Go to Step 2.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-893

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

connector B-09 is disconnected than when it is connected.

Q: When the knock sensor connector B-09 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-461

.

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

Replace the leaking injector. Then confirm that the malfunction 

symptom is eliminated.

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

• MB991911: Main Harness B

AK200961

1

2

CONNECTOR: B-09

B-09(GR)

KNOCK
SENSOR

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-894

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-26

.

NO :  Go to Step 2.

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

− Ignition Timing 

Check 

P.11A-7

.

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.

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-950

.

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

c. Item 25: Barometric pressure Sensor.

d. Item 69: Right Bank Heated Oxygen Sensor (rear).
e. Item 39: Right Bank Heated Oxygen Sensor (front).

f. Item 59: Left Bank Heated Oxygen Sensor (rear).

g. Item 11: Left Bank 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.

AK302970

AB

MB991911

MB991824

MB991827

AK302970

AB

MB991911

MB991824

MB991827

 

 

 

 

 

 

 

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