Mitsubishi Lancer Evolution IX. Manual - part 391

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-39

STEP 10. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 11 . 

NO : 

Repair or replace the connector.

STEP 11. Check harness between B-105 (terminal 
No. 5) air flow sensor connector and C-119 
(terminal No. 34) engine-ECU connector.

• Check earthing line for open circuit or damage.

Q: Is the check result normal?

YES : 

Go to Step 8 . 

NO : 

Repair the damaged harness wire.

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-40

STEP 12. Perform voltage measurement at B-105 
air flow sensor connector.

• Use special tool test harness (MB991709) to con-

nect only terminal No. 1, No. 2 and No. 5, and 
then measure at pick-up harness.

• Ignition switch: "ON"

• Voltage between terminal No. 1 and earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal?

YES : 

Go to Step 14 . 

NO : 

Go to Step 13 . 

STEP 13. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check and repair harness between B-105 

(terminal No. 1) air flow sensor connector 
and C-119 (terminal No. 42) engine-ECU 
connector.

• Check power supply line for damage.

NO : 

Repair or replace the connector.

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-41

STEP 14. Perform voltage measurement at B-105 
air flow sensor connector.

• Use special tool test harness (MB991709) to con-

nect only terminal No. 1, No. 2 and No. 5, and 
then measure at pick-up harness.

• Ignition switch: "ON"

• Voltage between terminal No. 5 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES : 

Go to Step 16 . 

NO : 

Go to Step 15 . 

STEP 15. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check and repair harness between B-105 

(terminal No. 5) air flow sensor connector 
and C-119 (terminal No. 34) engine-ECU 
connector.

• Check earthing line for damage.

NO : 

Repair or replace the connector.

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-42

STEP 16. Perform voltage measurement at B-105 
air flow sensor connector.

• Use special tool test harness (MB991709) to con-

nect only terminal No. 1, No. 2 and No. 5, and 
then measure at pick-up harness.

• Ignition switch: "ON"

• Voltage between terminal No. 2 and earth.

OK:

Altitude 0 m: 3.8 

− 4.2 V 

Altitude 600 m: 3.5 

− 3.9 V

Altitude 1,200 m: 3.3 

− 3.7 V 

Altitude 1,800 m: 3.0 

− 3.4 V 

Q: Is the check result normal?

YES : 

Go to Step 19 .

NO : 

Go to Step 17 . 

STEP 17. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 18 . 

NO : 

Repair or replace the connector.

AK305005

3

4

5

1

2

6

7

AB

Connector : B-105

Harness side 
connector

B-105(B)

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>