Mitsubishi Eclipse. Manual - part 430

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-263

STEP 12. Check for harness damage between right bank 
injector connector and ECM connector <M/T> or PCM 
connector <A/T>.

a. Check the harness wire between right bank injector connec-

tor B-01 (terminal No. 2) and ECM connector C-51 (terminal 
No. 1) <M/T> or PCM connector C-52 (terminal No. 1) 
<A/T> when checking No. 1 cylinder.

b. Check the harness wire between right bank injector connec-

tor B-05 (terminal No. 2) and ECM connector C-51 (terminal 
No. 24) <M/T> or PCM connector C-52 (terminal No. 24) 
<A/T> when checking No. 3 cylinder.

c. Check the harness wire between right bank injector connec-

tor B-26 (terminal No. 2) and ECM connector C-51 (terminal 
No. 10) <M/T> or PCM connector C-52 (terminal No. 10) 
<A/T> when checking No. 5 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair it. Then go to Step 14.

AK300445

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

CONNECTOR: C-62 <M/T>

C-62 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300752

1

2

CONNECTORS: B-01, B-05, B-26

AB

B-05 (GR) B-26 (GR)

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

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

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-264

STEP 13. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test.

P.13B-1106

Q: Is the fuel pressure normal?

YES : Replace the ECM or PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

STEP 14. 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.13B-7

.

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

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

AK300458

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

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-265

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

Right Bank Heated Oxygen Sensor (front) Heater Circuit

AK101598

3 4

1 2

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

BL

UE-

WHITE

BATTERY

1

2

4

3

RIGHT BANK HEATED
OXYGEN SENSOR (FRONT)

     B-27
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>

4

MFI
RELAY

C-51 <M/T>, C-52 <A/T>
         (MU803784)

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

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-266

.

CIRCUIT OPERATION

• Power is supplied from the MFI relay (terminal 

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

• The ECM (terminal No. 4) <M/T> or PCM (termi-

nal No. 4) <A/T> controls continuity to the right 
bank 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
Right bank heated oxygen sensor heater (front) cur-

rent 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

.

AK300057

RIGHT BANK 
HEATED OXYGEN
SENSOR (FRONT)

AB

B-27 (B)

CONNECTOR: B-27

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)