Mitsubishi Lancer Evolution IX. Manual - part 441

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-239

STEP 5. Check harness between C-14 (terminal 
No. 16) diagnosis connector and battery.

NOTE: Before checking harness, check intermediate 
connectors C-126, C-211 and C-214, and repair if 
necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Check and repair harness between C-14 

(terminal No. 4 and No. 5) diagnosis 
connector and body earth.

• Check earthing line for damage.

NO : 

Repair the damaged harness wire.

AK203591

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AD

Connector: C-14

Harness side connector

C-14 (B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-240

Inspection Procedure 2: Communication with Engine-ECU only is not Possible.

OPERATION

• There is data communication between diagnosis 

connector output terminal (terminal No. 7) and 
engine-ECU (terminal No. 85).

COMMENTS ON TROUBLE SYMPTOM

• Failure is possibly caused by failed power supply 

circuit or failed earthing circuit of engine-ECU.

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AK501824

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

Engine-ECU

J/C (2) <C-101> (*1) or <C-23> (*2)

C-14

85

O

O

O

O

9 (*1) or 14 (*2)

10

 (*1) or 15 (*2)

7

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  PU: Purple

AB

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

Diagnosis connector circuit

Diagnosis connector

23

C-124

C-117

(MU803783)

O

20

19

*1

*2

J/C (6)

C-105

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-241

PROBABLE CAUSES

• Open/short circuit in engine-ECU power circuit

• Short circuit in diagnosis connector circuit

• Failed engine-ECU

DIAGNOSIS PROCEDURE

NOTE: 

.

*1: L.H. drive vehicles
*2: R.H. drive vehicles

STEP 1. Check engine warning lamp.

• Ignition switch: OFF → ON

Q: Is lamp illuminating for few seconds?

YES : 

Go to Step 2 .

NO : 

Check engine-ECU power supply, engine 
control relay and ignition switch IG1 system 
(Refer to Inspection Procedure 23 

P.13A-302

).

STEP 2. Connector check: C-117 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

AK501996

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

AB

Connector: C-117

C-117 (GR)

C-117 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-242

STEP 3. Check harness between C-14 (terminal 
No. 7) diagnosis connector and C-117 (terminal 
No. 85) engine-ECU connector.

NOTE: Before Checking harness, check intermedi-
ate connectors C-105*

1

, C-124 and C-101*

1

 or 

C-23*

2

, and repair if necessary.

• Check communication line for open/short circuit 

and damage.

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair the damaged harness wire.

STEP 4. Check the trouble symptom.

Q: Does trouble symptom persist?

YES : 

Replace the engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

AK203591

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AD

Connector: C-14

Harness side connector

C-14 (B)

AK501996

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

AB

Connector: C-117

C-117 (GR)

C-117 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>