Mitsubishi Montero Sport (2004+). Manual — part 333

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-745

STEP 5. 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 6.
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 6. 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 9.
NO : Go to Step 7.

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-746

STEP 7. Check the injector.
(1) Disconnect the injector connector, which deviates from the

standard value at Step 6.

(2) Measure the resistance between 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 injector. Then confirm that the

malfunction symptom is eliminated.

STEP 8. Check harness connectors A-70, A-71, A-72, A-73,
A-74 or A-75 at injector for damage.
Check the injector connector, which deviates from the standard
value at Step 6.
Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate

connector and injector connector because of harness
damage. Then confirm that the malfunction symptom
is eliminated.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 9. Check harness connector A-04 at the injector
intermediate connector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK200022

1

2

AB

CONNECTORS: A-70, A-71, A-72, A-73, A-74,
A-75

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

A-73(GR)

A-74(GR)

A-75(GR)

AK000456

1 2

INJECTOR SIDE
CONNECTOR

AB

AK200022

1

2

AB

CONNECTORS: A-70, A-71, A-72, A-73, A-74,
A-75

A-70(GR)

A-71(GR)

A-72(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

A-73(GR)

A-74(GR)

A-75(GR)

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE
CONNECTOR

A-04(B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-747

STEP 10. Check the harness connector C-89 at the PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 11.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 11. C Check for harness damage between injector
intermediate connector A-04 and PCM connector C-89.

a. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 3) and PCM connector C-89 (ter-
minal No. 1) when checking No. 1 cylinder injector.

b. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 2) and PCM connector C-89 (ter-
minal No. 9) when checking No. 2 cylinder injector.

c. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 1) and PCM connector C-89 (ter-
minal No. 24) when checking No. 3 cylinder injector.

d. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 7) and PCM connector C-89 (ter-
minal No. 2) when checking No. 4 cylinder injector.

e. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 6) and PCM connector C-89 (ter-
minal No. 10) when checking No. 5 cylinder injector.

f. Check the harness wire between injector intermediate con-

nector A-04 (terminal No. 5) and PCM connector C-89 (ter-
minal No. 25) when checking 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 the compression pressure.

d. Check if the foreign materials (water,

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair it.Then confirm that the malfunction symptom

is eliminated.

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200014

7

2 1
6 5

4 3
8

CONNECTOR: A-04

AB

FEMALE SIDE
CONNECTOR

A-04(B)

AK103914

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

CONNECTOR: C-89

C-89(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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INSPECTION PROCEDURE 8: Unstable Idle (Rough Idle, Hunting).

.

COMMENT

• In cases such as the above, the cause is proba-

bly the air/fuel mixture or idle air control motor.
Other systems affecting idle quality include the
ignition system and compression.

.

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

• Malfunction of the ignition system.

• Malfunction of air/fuel ratio control system.

• Malfunction of the IAC system.

• Malfunction of the evaporative emission purge

solenoid system.

• Poor compression pressure.

• Vacuum leak.

• Malfunction of the EGR vacuum regulator sole-

noid valve 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. Check if the battery terminal is disconnected.
Q: Has the battery terminal been disconnected lately?

YES : Start the engine and let it run at idle for approximate

10 minutes after engine warm up.Then, if a
malfunction occurs, go to Step 2.

NO : Go to Step 2.

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 is 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