Mitsubishi Montero (2004+). Manual - part 343

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-859

STEP 14. Check for harness damage between injector 
connector and PCM connector.

a. Check the harness wire between injector connector 

B-01 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 1) at No. 1 cylinder injector.

b. Check the harness wire between injector connector 

B-33 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 5) at No. 2 cylinder injector.

c. Check the harness wire between injector connector 

B-02 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 14) at No. 3 cylinder injector.

d. Check the harness wire between injector connector 

B-35 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 21) at No. 4 cylinder injector.

e. Check the harness wire between injector connector 

B-03 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 2) at No. 5 cylinder injector.

f. Check the harness wire between injector connector 

B-11 (terminal No. 2) and PCM connector D-132 (termi-
nal No. 6) at No. 6 cylinder injector.

Q: Is the harness wire in good condition?

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

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

cables.

b.Check if the injectors are clogged.
c.Check compression pressure.
d.Check fuel lines for clogging.
e.Check if the foreign materials (water, kerosene, 

etc.) got into fuel.

f.Check the EGR valve.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

INSPECTION PROCEDURE 7: Hard Starting

.

COMMENT

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

either weak spark, improper air-fuel mixture or 
low compression.

.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor fuel quality. (Contamination)

• Poor compression.

• Dirtiness around throttle valve.

• Malfunction of the EGR valve.

DIAGNOSIS

Required Special Tools:

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

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

AK200938

2

3

4

5

6

7

8

9

1

10

14

15

16

17

18

19

20

21

22

23

24

25

26

27

11

12

13

AB

CONNECTOR: D-132

HARNESS CONNECTOR: 
COMPONENT SIDE

PCM

D-132(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-860

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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

• The voltage is 8 volts or more.

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

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

− Battery check 

P.54A-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 the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-26

. 

NO :  Go to Step 3.

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-966

.

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.

AK302970

AB

MB991911

MB991824

MB991827

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-861

STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch the "ON" position.
(2) 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 18: Cranking signal (ignition switch-ST).

(3) Turn the ignition switch 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.

STEP 5. Inspection of throttle body (throttle valve area) for 
dirtiness.
Q: Is the throttle valve area dirty?

YES : Refer to On-vehicle service 

− Clean the throttle valve 

area 

P.13A-993

.

NO :  Go to Step 6.

STEP 6. 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 7.
NO :  Check that the crankshaft position sensor and timing 

belt cover are in the correct position. 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-862

STEP 7. Check the left bank injector.
(1) Disconnect the left bank injector connector B-11, B-33, 

B-35.

(2) Measure the resistance between each injector side 

connector terminal No. 1 and No. 2.

Standard value: 13 

− 16 ohms [at 20°C (68°F)]

Q: Is the resistance between 13 and 16 ohms [at 20

°C 

(68

°F)]?

YES : Go to Step 8.
NO :  Replace the faulty injector. Then confirm that the 

malfunction symptom is eliminated.

STEP 8. Check the right bank injector resistance at injector 
intermediate connector B-44.
(1) Disconnect the injector intermediate connector B-44.

(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. 

1 at No. 3 cylinder injector.

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

6 at No. 5 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 11.
NO :  Go to Step 9.

AK201292

1

2

B-11(GR)

B-35(GR)

B-33(GR)

CONNECTORS: B-11, B-33, B-35

AB

HARNESS 
CONNECTORS: 
COMPONENT SIDE

AKX01414AB

INJECTOR SIDE
CONNECTOR

1 2

AK200949

3

4

7

8

1

2

5

6

B-44(B)

CONNECTOR: B-44

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

AKX01414AB

INJECTOR SIDE
CONNECTOR

1 2