Mitsubishi Montero (2004+). Manual — part 241

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-451

STEP 2. Using scan tool MB991958, check data list item 81
<bank 1> and 83 <bank 2>: Long-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item

81 <bank 1> and 83 <bank 2>, Long-Term Fuel Trim.

• The fuel trim should be between −12.5 and +12.5 when

the load is 2,500 r/min (during closed loop) after the
engine is warmed.

Q: Is the specification normal?

YES : Go to Step 3.
NO : Refer to DTC P0171

− System too Lean (bank 1)

P.13A-367

, DTC P0172

− System too Rich (bank 1)

P.13A-375

, DTC P0174

− System too Lean (bank 2)

P.13A-381

, DTC P0175

− System too Rich (bank 2)

P.13A-389

.

STEP 3. Using scan tool MB991958, check data list item 82
<bank 1> and 84 <bank 2>: Short-Term Fuel Trim.
(1) Start the engine and run at idle.
(2) Set scan tool MB991958 to the data reading mode for item

82 <bank 1> and 84 <bank 2>, Short-Term Fuel Trim.

• The fuel trim should be between −12.5 and +12.5 when

the load is 2,500 r/min (during closed loop) after the
engine is warmed.

Q: Is the specification normal?

YES : Go to Step 4.
NO : Refer to DTC P0171

− System too Lean (bank 1)

P.13A-367

, DTC P0172

− System too Rich (bank 1)

P.13A-375

, DTC P0174

− System too Lean (bank 2)

P.13A-381

, DTC P0175

− System too Rich (bank 2)

P.13A-389

.

AK302970

AB

MB991911

MB991824

MB991827

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-452

STEP 4. Check the ignition coil spark.
(1) Check each ignition coil spark.
(2) Remove the intake manifold.
(3) Remove the spark plug and connect to the spark plug

cable.

(4) Ground the spark plug side electrode securely.

• When the engine is cranked, the spark plug should

spark.

Q: Did it spark?

YES : Go to Step 7.
NO : Go to Step 5.

STEP 5. Check the spark plugs.

CAUTION

Do not attempt to adjust the gap of the iridium plug. Clean-
ing of the iridium plug may result in damage to the iridium
and platinum tips. Therefore, if carbon deposits must be
removed, use a plug cleaner and complete cleaning within
20 seconds to protect the electrode. Do not use a wire
brush.
(1) Check the plug gap and replace if the limit is exceeded.

Standard value: 1.0

− 1.1 mm (0.039 − 0.043 inch)

Limit: 1.3 mm (0.051 inch)

Q: Is the plug gap at the standard value?

YES : Go to Step 6.
NO : Replace the faulty spark plug. Then go to Step 13.

STEP 6. Check the spark plug cable.
(1) Check the cap and coating for cracks.
(2) Measure the resistance.

Limit: maximum 9 k

Ω

Q: Is the resistance normal?

YES : Refer to INSPECTION PROCEDURE 31

− Ignition

Circuit System

P.13A-933

.

NO : Replace the faulty spark plug cable. Then go to Step

13.

AKX00432

SPARK PLUG

AB

AKX01327AB

IRIDIUM
TIP

PLATINUM
TIP

AKX00382

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-453

STEP 7. Check the injector.
(1) Disconnect the injector connector.

(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 go to Step 13.

STEP 8. Check harness connector B-01, B-33, B-02, B-35,
B-03, B-11 at injector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 9.
NO : Repair or replace the faulty injector. Refer to GROUP

00E, Harness Connector Inspection

P.00E-2

. Then go

to Step 13.

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

AKX01414AB

INJECTOR SIDE
CONNECTOR

1 2

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-454

STEP 9. Check harness connector D-132 at PCM 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 go to Step 13.

STEP 10. 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 (terminal 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 (terminal 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 (terminal 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 (terminal 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 (terminal 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 (terminal No. 6)
at No. 6 cylinder injector.

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 13.

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)

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)