Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 303

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-411

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Comunication with All
Systems Is Not Possible.)

AK000673

15

14

13

12

11

10

1 2 3 4 5 6 7 8
9

16

1

1

6

4

5

11

10

12 13

15

17

16

14

19

18

8 9

7

20

2

15 16

26 27 28 29

32 33 34

17 18 19 20 21 22 23 24 25

30 31

36 37

35

38

10

11 12 13

1 2 3

4 5 6 7 8 9

14

3

RED

RED

RED-BLA

CK

BLA

CK

BLA

CK

BLA

CK

FUSIBLE LINK(2)

C-89

C-110

C-104
MU801457

C-29

DATA LINK
CONNECTOR

38

1

18

16

JOINT
GROUND
POINT

4

5

JUNCTION
BLOCK

ACX02447

CONNECTOR:C-29

ACCELERATOR
PEDAL

DATA LINK
CONNECTOR

AI

AK000355 AC

CONNECTOR:C-110

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-412

CIRCUIT OPERATION

•

A battery positive voltage is applied on the data
link connector power terminal (terminal 16). The
ground terminals (terminal 4, 5) are grounded to
the vehicle body.

COMMENT

•

The cause is probably a defect in power supply
system (including ground) for the on-board
diagnostic test mode line.

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

•

Malfunction of the data link connector.

•

Damaged harness wire.

DIAGNOSIS

STEP 1. Check the power supply voltage at data link
connector C-29.
(1) Measure voltage between terminal 16 and ground.

•

Voltage should be battery positive voltage.

Q: Is the voltage normal?

YES : Go to step 2.
NO : Check harness connectors C-104, C-110 and C-89 at

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

P.00E-2

). If intermediate

connectors are in good condition, repair harness wire
between fusible link (2) and data link connector C-29
terminal 16 because of open circuit. Then confirm that
the malfunction symptom is eliminated.

STEP 2. Check the continuity at data link connector C-29.
(1) Check for the continuity between terminal 4, 5 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Replace the scan tool. Then confirm that the

malfunction symptom is eliminated.

NO : Repair harness wire between data link connector C-

29 terminal 4, 5 and ground because of open circuit or
harness damage. Then confirm that the malfunction
symptom is eliminated.

AK000311

AK000311

CONNECTOR:C-104

AC

AK000345AE

CONNECTOR:C-89

AKX01430AF

1 2 3 4 5 6 7 8
9 10 111213141516

C-29 HARNESS
SIDE CONECTOR

AKX01431AE

1 2 3 4 5 6 7 8
9 10 111213141516

C-29 HARNESS
SIDE CONECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-413

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

AK000711

GRA

Y

-

RED

GRA

Y

-

RED

GRA

Y

-

RED

RED-

WHITE

RED-

WHITE

RED-

WHITE

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

JOINT
CONNECTOR(1)

DATA LINK
CONNECTOR

1

11

8

9

10

12

15

7

84

85

C-28

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

C-77

16

15

18

17

14

20

22

21

9

7

1 2

5

19

3

33

32

30 31

29

28

25

24

23

27

26

6

11

13

4

10

8

12

C-29

15

14

13

12

11

10

1 2 3 4 5 6 7 8
9

16

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

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97

96

100

89

78

71

90

76 77

75

72
79

97

C-62<M/T>
(MU803783)

C-59<A/T>
(MU803782)

ACX02447

CONNECTOR:C-29

ACCELERATOR
PEDAL

DATA LINK
CONNECTOR

AI

AK000312AH

CONNECTOR:C-77

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-414

CIRCUIT OPERATION

•

A diagnostic output is made from the ECM
(terminal 85) <M/T> or PCM (terminal 85) <A/T>
to the diagnostic output terminal (terminal 7) of
the data link connector.

•

When diagnostic test mode control terminal
(terminal 1) of the data link connector is
grounded, the ECM (terminal 84) <M/T> PCM
(terminal 84) <A/T> changes to the diagnostic
test mode.

COMMENT

•

No power supply to ECM <M/T> or PCM <A/T>.

•

Defective ground circuit of ECM <M/T> or PCM
<A/T>.

•

Defective ECM <M/T> or PCM <A/T>.

•

Improper communication line between ECM <M/
T> or PCM <A/T> and scan tool.

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

•

Malfunction of ECM <M/T> or PCM <A/T> power
supply circuit.

•

Malfunction of the ECM <M/T> or PCM <A/T>.

•

Open circuit between ECM <M/T> or PCM <A/T>
and data link connector.

DIAGNOSIS

STEP 1. Check connector C-62 at ECM <M/T> or connector
C-59 at PCM <A/T> for damage.
Q: Is the 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.

AK000225

CONNECTOR : C-62<M/T>, C-59<A/T>

C-59

C-62

PCM<A/T>

ECM<M/T>

AL

AK000733AC

CONNECTOR:C-28

AK000225

CONNECTOR : C-62<M/T>, C-59<A/T>

C-59

C-62

PCM<A/T>

ECM<M/T>

AL