Mitsubishi Eclipse. Manual - part 192

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-261

STEP 10. Check for harness damage between injector 
connector B-01, B-02, B-05, B-06 and ECM connector C-49 
<M/T> or PCM connector C-50 <A/T>.

a. Check the harness wire between injector connector B-01 

(terminal No. 2) and ECM connector C-49 (terminal No. 1) 
<M/T> or PCM connector C-50 (terminal No. 1) <A/T> when 
checking No. 1 cylinder.

b. Check the harness wire between injector connector B-02 

(terminal No. 2) and ECM connector C-49 (terminal No. 14) 
<M/T> or PCM connector C-50 (terminal No. 9) <A/T> when 
checking No. 2 cylinder.

c. Check the harness wire between injector connector B-05 

(terminal No. 2) and ECM connector C-49 (terminal No. 2) 
<M/T> or PCM connector C-50 (terminal No. 24) <A/T> 
when checking No. 3 cylinder.

d. Check the harness wire between injector connector B-06 

(terminal No. 2) and ECM connector C-49 (terminal No. 15) 
<M/T> or PCM connector C-50 (terminal No. 2) <A/T> when 
checking No. 4 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

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

AK300737

1

2

CONNECTORS: B-01, B-02, B-05, B-06

AB

B-02 (GR)

B-01 (GR)

B-05 (GR)

B-06 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-262

STEP 11. Check the fuel pressure.
Refer to, Fuel Pressure Test 

P.13A-929

.

Q: Is the fuel pressure normal?

YES : Replace the ECM or PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0134 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK300414

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

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-263

DTC P0135: Heated Oxygen Sensor Heater Circuit (sensor 1)

AK101513

3 4

1 2

57 58

60 61

53

52

51

55

54

56

59

62

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

BROWN-

WHITE

BATTERY

1

2

4

3

HEATED OXYGEN
SENSOR (FRONT)

     B-17
MU802605

1

2

3

4

TO ECM
OR PCM

TO ECM
OR PCM

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

60 <M/T>
3 <A/T>

C-50 <A/T>
(MU803784)

C-56 <M/T>
(MU803770)

MFI
RELAY

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

3132 33

34 35

1

10

Heated Oxygen Sensor (front) Heater Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-264

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

No. 4) to the heated oxygen sensor (front) heater.

• The ECM (terminal No. 60) <M/T> or PCM (termi-

nal No. 3) <A/T> controls continuity to the heated 
oxygen sensor (front) heater by turning the power 
transistor in the ECM <M/T> or PCM <A/T> "ON" 
and "OFF".

.

TECHNICAL DESCRIPTION

• The ECM <M/T> or PCM <A/T> checks whether 

the heater current is within a specified range 
when the heater is energized.

.

DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor heater (front) current is out of 

specified range when engine coolant temperature 
is over 20

°C (68°F).

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Engine coolant temperature sensor

.

AK300060

ECM

CONNECTOR: C-56 <M/T>

AF

C-56 (G)

AK300060AD

C-50 (GR)

PCM

CONNECTOR: C-50 <A/T>

AK300051AB

B-17 (B)

HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-17

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X