Mitsubishi Montero (2004+). Manual - part 234

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-423

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is running.

Judgment Criteria

• Injector coil surge voltage (battery positive volt-

age + 2 volts) has not been detected for 2 sec-
onds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Injector failed.

• Open or shorted injector circuit, or loose connec-

tor.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991474: Test Harness

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

CONTINUOUS

FAILURE FOR 2secs

INJ. SURGE V < V

B

 + 2.0 V

AK302941

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-424

STEP 1. Using scan tool MB991958, check actuator test 
item 01, 02, 03, 04, 05, 06: Injectors.

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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for 

item 01, 02, 03, 04, 05, 06, Injectors.

(4) Warm up the engine to normal operating temperature: 80

°C 

to 95

°C (176°F to 203°F).

• The idle should become slightly rougher.

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

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check harness connector B-44 at injector 
intermediate connector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 17. 

AK302970

AB

MB991911

MB991824

MB991827

AK200949

3

4

7

8

1

2

5

6

B-44(B)

CONNECTOR: B-44

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-425

STEP 3. Check the injector resistance at injector 
intermediate connector B-44.
(1) Disconnect the injector intermediate connector B-44 and 

measure at the injector side.

(2) Measure the resistance between each male connector side 

terminal.

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

3 at No. 1 cylinder injector.

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

2 at No. 2 cylinder injector.

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

1 at No. 3 cylinder injector.

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

7 at No. 4 cylinder injector.

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

6 at No. 5 cylinder injector.

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

5 at No. 6 cylinder injector.

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

(68

°F)].

Q: Is the measured resistance between 13 and 16 ohms [at 

20

°C (68°F)]?

YES : Go to Step 6.
NO :  Go to Step 4.

STEP 4. Check the injector connector for damage.

a. Check the harness connector B-01 at No. 1 cylinder injec-

tor.

b. Check the harness connector B-33 at No. 2 cylinder injec-

tor.

c. Check the harness connector B-02 at No. 3 cylinder injec-

tor.

d. Check the harness connector B-35 at No. 4 cylinder injec-

tor.

e. Check the harness connector B-03 at No. 5 cylinder injec-

tor.

f. Check the harness connector B-11 at No. 6 cylinder injector.

Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 17.

AK200949

3

4

7

8

1

2

5

6

B-44(B)

CONNECTOR: B-44

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AKX01494

INJECTOR INTERMEDIATE
MALE SIDE CONNECTOR

1 2 3 4

5 6 7 8

AB

AK200960

1

2

B-03(GR)

B-11(GR)

B-35(GR)

B-33(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03, B-11, 

B-33, B-35

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-426

STEP 5. Check for open circuit and harness damage 
between injector intermediate connector and injector 
connector.

a. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-01 
(terminal No. 1) and injector connector B-01 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 3) at 
No. 1 cylinder injector.

b. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-33 
(terminal No. 1) and injector connector B-33 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 2) at 
No. 2 cylinder injector.

c. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-02 
(terminal No. 1) and injector connector B-02 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 1) at 
No. 3 cylinder injector.

d. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-35 
(terminal No. 1) and injector connector B-35 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 7) at 
No. 4 cylinder injector.

e. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-03 
(terminal No. 1) and injector connector B-03 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 6) at 
No. 5 cylinder injector.

f. Check the harness wire between injector intermediate con-

nector B-44 (terminal No. 8) and injector connector B-11 
(terminal No. 1) and injector connector B-11 (terminal No. 2) 
and injector intermediate connector B-44 (terminal No. 5) at 
No. 6 cylinder injector.

Q: Is the harness wire in good condition?

YES : Replace the injector. Then go to Step 17.
NO :  Repair it. Then go to Step 17.

AK200949

3

4

7

8

1

2

5

6

B-44(B)

CONNECTOR: B-44

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AK200960

1

2

B-03(GR)

B-11(GR)

B-35(GR)

B-33(GR)

B-02(GR)

B-01(GR)

CONNECTORS: B-01, B-02, B-03, B-11, 

B-33, B-35

AB

HARNESS CONNECTOR: 
COMPONENT SIDE