Mitsubishi Eclipse. Manual - part 349

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-889

STEP 2. Check the circuit at ECM connector C-49 <M/T> or 
PCM connector C-50 <A/T>.
(1) Disconnect the connectors C-49 <M/T> or C-50 <A/T> and 

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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3

4

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8

9

11

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20

30

21

22

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24

25

26

27

28

29

31

32

33

34

35

1

10

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-890

(3) Measure the voltage between terminal No. 8 <M/T> or No. 

20 <A/T> and ground.

• Voltage should be battery positive voltage.

(4) Using a jumper wire, connect terminal No. 8 <M/T> or No. 

20 <A/T> to ground.

• A/C compressor relay should turn "ON".

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor relay condition 

normal?
YES : Go to Step 3.
NO :  Refer to GROUP 55, Heating and air conditioning 

− 

Introduction To Heater, Air Conditioning And 
Ventilation Diagnosis 

P.55-4

. Then confirm that the 

malfunction symptom is eliminated.

AK000419AI

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2

3

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8

9

10

11

12

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18

19

20

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24

25

26

<M/T>

C-49 HARNESS
CONNECTOR:
COMPONENT SIDE

AKX01448

1

2

3

4

5

6

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8

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36

C-50  HARNESS 
CONNECTOR:
COMPONENT SIDE

<A/T>

AR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-891

STEP 3. Check the circuit at ECM connector C-53 <M/T> or 
PCM connector C-57 <A/T>.
(1) Disconnect the connectors C-53 <M/T> or C-57 <A/T> and 

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.

AK300417

34 33 32

36 35

37

42

45

31

39

38

46

40

41

43

44

CONNECTOR: C-53 <M/T>

C-53 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300735

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

CONNECTOR: C-57 <A/T>

C-57 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-892

(3) Measure the voltage between terminal No. 45 <M/T> or No. 

83 <A/T> and ground.

• Voltage should be 1 volt or less when the A/C switch is 

"OFF".

• Voltage should be battery positive voltage when the A/C 

switch is "ON".

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Replace the ECM or PCM. Then confirm that the 

malfunction symptom is eliminated.

NO :  Refer to GROUP 55, Heating and air conditioning 

− 

Introduction To Heater, Air Conditioning And 
Ventilation Diagnosis 

P.55-4

. 

DATA LIST REFERENCE TABLE

M1131152000865

CAUTION

• When shifting the select lever to D range, the brakes should be applied so that the vehicle does 

not move forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: 

.

*1

: If the idle speed is lower than the standard value on a very cold engine [approximately 

−

20

°

C (

−

4

°

F)] even 

when the IAC motor is fully opened, the air volume limiter built in the throttle body could be defective.

*2

: In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is some-

times 30 steps greater than the standard value.

*3

: The injector drive time represents the time when the cranking speed is at 250 r/min or below when the 

power supply voltage is 11 volts.

*4

: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is sometimes 10% 

longer than the standard time.

*5

: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume airflow sensor output fre-

quency is sometimes 10% higher than the standard frequency.

*6

: GST items. [Data list items consist of MUT-III items and GST items. GST items can be accessed through 

the use of a general scan tool (GST). When scan tool MB991958 (MUT-III sub assembly) is used, MUT-III 
items appear alphabetically; then, GST items appear alphabetically. The black and white characters of the 
GST items are inverted from the MUT-III items.]

AK000420

<M/T>

C-53 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AI

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

AKX01449

C-57 HARNESS 
CONNECTOR: 
COMPONENT SIDE

<A/T>

77 76
89 88
98

75
87

97

86
96

85
95

84

82

83
94 93

81
92

80

74 73 72 71

79 78
91 90

AR