Mitsubishi Lancer Evolution IX. Manual - part 395

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-55

STEP 6. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check and repair harness between B-107 

(terminal No. 1) engine coolant temperature 
sensor connector and C-119 (terminal No. 
44) engine-ECU connector.

• Check output line for open circuit.

NO : 

Repair or replace the connector.

STEP 7. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal? 

YES : 

Go to Step 8 .

NO : 

Repair or replace the connector.

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>

AK305008

1

2

AB

Connector : B-107

Harness side 
connector

B-107(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-56

STEP 8. Check harness between B-107 (terminal 
No. 1) engine coolant temperature sensor 
connector and C-119 (terminal No. 44) 
engine-ECU connector.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

STEP 9. M.U.T.-II/III data list

• Item No. 21: Engine coolant temperature sensor

OK:

Engine cold state: At ambient temperature or 

equivalent.

Engine hot state: At 80 

− 120°C

Q: Is the check result normal? 

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Replace the engine-ECU.

STEP 10. Perform resistance measurement at 
B-107 engine coolant temperature sensor 
connector.

• Disconnect connector and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Go to Step 11 .

AK305008

1

2

AB

Connector : B-107

Harness side 
connector

B-107(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>

AK305008

1

2

AB

Connector : B-107

Harness side 
connector

B-107(B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-57

STEP 11. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair or replace the connector.

STEP 12. Check harness between B-107 (terminal 
No. 2) engine coolant temperature sensor 
connector and C-119 (terminal No. 49) 
engine-ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 9 .

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>

AK305008

1

2

AB

Connector : B-107

Harness side 
connector

B-107(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-58

STEP 13. Perform voltage measurement at B-107 
engine coolant temperature sensor connector.

• Use special tool test harness (MB991658) to con-

nect connector, and measure at pick-up harness.

• Ignition switch: "ON"

• Voltage between terminal No. 1 and earth.

OK:

Engine coolant temperature at 

−20°C: 3.9 − 4.5 

V

Engine coolant temperature at 0

°C: 3.2 − 3.8 V

Engine coolant temperature at 20

°C: 2.3 − 2.9 

V

Engine coolant temperature at 40

°C: 1.3 − 1.9 

V

Engine coolant temperature at 60

°C: 0.7 − 1.3 

V

Engine coolant temperature at 80

°C: 0.3 − 0.9 

V

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 14 .

STEP 14. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair or replace the connector.

AK305008

1

2

AB

Connector : B-107

Harness side 
connector

B-107(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>