Mitsubishi Montero Sport (2004+). Manual - part 327

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-721

STEP 2. Check for open circuit, short circuit to ground and 
harness damage between data link connector C-69 
(terminal No. 1) and PCM connector C-91 (terminal No. 84).

NOTE: Check harness after checking intermediate connectors 
C-10 and C-16. If intermediate connector C-10 and C-16 are 
damaged, repair or replace them. Refer to GROUP 00E, Har-
ness Connector Inspection 

P.00E-2

. Then check that the mal-

function is eliminated.
Q: Is the harness wire in good condition?

YES :  Go to Step 3.
NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK302269

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

CONNECTOR: C-69

C-69(B)

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

AB

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-722

STEP 3. Check for open circuit, short circuit to ground and 
harness damage between data link connector C-69 
(terminal No. 7) and PCM connector C-91 (terminal No. 85).

NOTE: Check harness after checking intermediate connectors 
C-10 and C-16. If intermediate connector C-10 and C-16 are 
damaged, repair or replace them. Refer to GROUP 00E, Har-
ness Connector Inspection 

P.00E-2

. Then check that the mal-

function is eliminated.
Q: Is the harness wire in good condition?

YES : Refer to, INSPECTION PROCEDURE 28 

− Power 

Supply System and Ignition Switch-IG System 

P.13A-804

.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK302269

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

CONNECTOR: C-69

C-69(B)

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

AB

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-723

INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check 
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.

GREEN-

WHITE

AK302270

Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit

BL

ACK

-

WHITE

BL

ACK

-

WHITE

GREEN-

WHITE

9

23

22

8

4

2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

1

D-06

D-06

D-08

JUNCTION
BLOCK

ST

LOCK

ACC

IG1

R

2

1
3

2
4

D-08
(MU801342)

1 2 3
4 5 6

D-15

IGNITION
SWITCH

22

21

23 24 25 26 27

28 29 30 31 32

C-04

Malfunction Indicator Lamp
(SERVICE ENGINE SOON or
Check Engine Lamp)

POWERTRAIN CONTROL
MODULE (PCM)

24

IG2

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15 16 17 18 19 20 21 22

C-16
MU801461

10

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

C-89
(MU803784)

10A

8

AK103912AD

CONNECTOR: C-04

C-04

AK103911AE

CONNECTOR: C-16

C-16

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-724

.

CIRCUIT OPERATION

• The malfunction indicator lamp (SERVICE 

ENGINE SOON or Check Engine Lamp) power is 
supplied from the ignition switch.

• The PCM controls the ground of the malfunction 

indicator lamp (SERVICE ENGINE SOON or 
Check Engine Lamp) by turning the power tran-
sistor in the PCM ON and OFF.

.

COMMENT

• The PCM causes the malfunction indicator lamp 

(SERVICE ENGINE SOON or Check Engine 
Lamp) to illuminate for 5 seconds immediately 
after the ignition switch is turned to the "ON" posi-
tion occurred.

.

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

• Burnt-out bulb.

• Defective malfunction indicator lamp (SERVICE 

ENGINE SOON or Check Engine Lamp) circuit.

• Malfunction of the PCM. 

AK103738AD

CONNECTOR: C-89

PCM

C-89(GR)

AK200036AC

CONNECTORS: D-06

JUNCTION BLOCK
(FRONT SIDE)

D-06

AK200035AB

CONNECTOR: D-08

D-08

JUNCTION BLOCK
(REAR SIDE)

AK200040AB

CONNECTOR: D-15

D-15(B)