Mitsubishi Montero Sport (2004+). Manual — part 326

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-717

.

CIRCUIT OPERATION

• A battery positive voltage is applied on the data

link connector power terminal (terminal No. 16).
The ground terminals (terminals No. 4, No. 5) are
grounded to the vehicle body.

.

COMMENT

• The cause is probably a defect in power supply

system (including ground) for the on-board diag-
nostic test mode line.

.

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

• Malfunction of the data link connector.

• Damaged harness wire.

DIAGNOSIS

STEP 1. Measure the power supply voltage at data link
connector C-69.
(1) Measure voltage between terminal No. 16 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to step 2.
NO : Check harness connectors D-01 and D-06 at

intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connector D-01 and D-06 are in good condition, repair
an open circuit between fusible link (8) and data link
connector C-69 (terminal No. 16). Then confirm that
the malfunction symptom is eliminated.

AK200036AB

CONNECTORS: D-01, D-06

JUNCTION BLOCK
(FRONT SIDE)

D-06

D-01

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

AKX01430

1 2 3 4 5 6 7 8

16

15

14

13

12

11

10

9

C-69 HARNESS
CONNECTOR:
COMPONENT SIDE

AT

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-718

STEP 2. Check for continuity at data link connector C-69.
(1) Check for the continuity between terminals No. 4, No. 5 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Replace the scan tool. Then confirm that the

malfunction symptom is eliminated.

NO : Repair an open circuit or harness damage between

data link connector C-69 (terminals No. 4, No. 5) and
ground. 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

AKX01431AT

1 2 3 4 5 6 7 8
9 10 111213141516

C-69 HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-719

INSPECTION PROCEDURE 2: Scan Tool Communication with PCM Is Not Possible.

.

AK000622

Data Link Connector Circuit

GRA

Y

-

RED

YELL

OW

-

ORANGE

GREEN-

RED

YELL

OW

GRA

Y

-

RED

YELL

OW

DATA LINK
CONNECTOR

POWERTRAIN CONTROL MODULE (PCM)

8

19

8

19

15

5

84

85

1

7

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

1

9

2 3

4

5 6

7 8

10 11 12 13 14 15 16 17 18 19

C-10
MU801559

1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16

C-69

71

76

77

72 73 74

75

79 80

78

81

87 88

89

91

90

92

97

98

82

93

83

94

84 85

95

86

96

C-91
(MU803782)

JOINT
CONNECTOR (2)

AK103911AD

CONNECTOR: C-10, C-16

C-16

C-10

AK200038AB

CONNECTOR: C-69

DATA LINK
CONNECTOR

C-69(B)

AK103738AF

CONNECTORS: C-91

PCM

C-91(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-720

CIRCUIT OPERATION

• A diagnostic output is made from the PCM (termi-

nal No. 85) to the diagnostic output terminal (ter-
minal No. 7) of the data link connector.

• When diagnostic test mode control terminal (ter-

minal No. 1) of the data link connector is
grounded, the PCM (terminal No. 84) changes to
the diagnostic test mode.

.

COMMENT

• No power supply to PCM.

• Defective ground circuit of PCM.

• Defective PCM.

• Improper communication line between PCM and

scan tool.

.

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

• Malfunction of PCM power supply circuit.

• Malfunction of the PCM.

• Open circuit between PCM and data link connec-

tor.

DIAGNOSIS

STEP 1. Check harness connector C-91 at PCM for
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

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