Mitsubishi Montero Sport (2004+). Manual - part 331

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-737

INSPECTION PROCEDURE 6: Fires Up and Dies.

.

COMMENT

• In such cases as the above, the cause is usually 

improper air/fuel mixture. It is possible, though 
less likely, that the spark plugs are generating 
sparks but the sparks are weak.

.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Contaminated fuel.

• Poor compression.

• Malfunction of the PCM.

• Malfunction of the immobilizer system.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage should remain greater than 8 volts while the 

engine is cranked.

Q: Dose the voltage remain greater than 8 volts while the 

engine is cranked?
YES : Go to Step 2.
NO :  Refer to GROUP 54, Battery 

− Battery Check 

P.54-5

.

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 DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-26

.

NO :  Go to Step 3.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-738

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

Actuator Test Reference Table 

P.13A-854

.

a. Item 07: Fuel Pump.

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

YES : Go to Step 4.
NO :  Repair or replace. 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.13A-839

.

a. Item 21: Engine Coolant Temperature Sensor.

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

YES : Go to Step 5.
NO :  Repair or replace. Then confirm that the malfunction 

symptom is eliminated.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-739

STEP 5. Check the engine start-ability.
Depress the accelerator pedal slightly, and start the engine.
Q: Is the start ability good?

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

STEP 6. Check the idle air control (IAC) motor operation 
sound.
(1) Check that the engine coolant temperature is 20

°C (68°F) 

or below.
NOTE: If necessary, you can disconnect the engine coolant 
temperature sensor connector and connect the harness 
side of the connector to another engine coolant temperature 
sensor that is at 20

°

C (68

°

F) or below.

(2) Check that the operation sound of the IAC motor can be 

heard after the ignition is switched to the "ON" position (but 
without starting the engine).

• An operation sound is heard.

Q: Did you hear the operation sound?

YES : Carry out the following cleaning or adjustment.

a. Refer to On - vehicle Service - Clean the 

throttle valve area 

P.13A-881

.

NO :  Refer to  DTC P0506 

− Idle Control System RPM 

Lower Than Expected

P.13A-640

 , DTC P0507 

− Idle 

Control System RPM Higher Than 
Expected

P.13A-651

 .

STEP 7. Check the ignition timing.
(1) Check the ignition timing at cranking.

Standard value: 5

° BTDC ± 3°

Q: Is the ignition timing normal?

YES : Go to Step 8.
NO :  Check that the crankshaft position sensor and timing 

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

AK302271

1

2

3

4

5

6

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

CONNECTOR: A-40

A-40(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-740

STEP 8. Measure the right bank injector resistance at 
injector intermediate connector A-04.
(1) Disconnect the injector intermediate connector A-04.

(2) Measure the resistance between each male connector side 

terminal.

a. Measure the resistance between terminal No. 8 and No. 

3 when measuring No. 1 cylinder injector

b. Measure the resistance between terminal No. 8 and No. 

2 when measuring No. 2 cylinder injector

c. Measure the resistance between terminal No. 8 and No. 

1 when measuring No. 3 cylinder injector

d. Measure the resistance between terminal No. 8 and No. 

7 when measuring No. 4 cylinder injector

e. Measure the resistance between terminal No. 8 and No. 

6 when measuring No. 5 cylinder injector

f. Measure the resistance between terminal No. 8 and No. 

5 when measuring No. 6 cylinder injector

• Resistance should be between 13 and 16 ohms [at 20°C 

(68

°F)].

Q: Is the resistance normal?

YES : Go to Step 11.
NO :  Go to Step 9.

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE 
CONNECTOR

A-04(B)

AK000542

6

3 4
7 8

1 2
5

INJECTOR
INTERMEDIATE
CONNECTOR

AB