Mitsubishi Lancer Evolution IX. Manual - part 431

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-199

STEP 3. Perform voltage measurement at C-119 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Ignition switch: "ON"

• Voltage between terminal No. 54 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Go to Step 5 .

STEP 4. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

 Check intermediate connector A-13

*1

 or 

C-31

*2

, and repair if necessary. If 

intermediate connector is normal, check and 
repair harness between A-40 (terminal No. 
1) power steering fluid pressure switch 
connector and C-119 (terminal No. 54) 
engine-ECU connector.

• Check output line for open circuit.

NO : 

Repair or replace the connector.

AK501994

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AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK501994

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AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

1

AK502001AB

Connector: A-40

Harness side 
connector

A-40 (B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-200

STEP 5. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

STEP 6. Check harness between A-40 (terminal 
No. 1) power steering fluid pressure switch 
connector and C-119 (terminal No. 54) 
engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connector A-13

*1

 or C-31

*2

, and repair if necessary.

• Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 7 .

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>

1

AK502001AB

Connector: A-40

Harness side 
connector

A-40 (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-201

STEP 7. M.U.T.-II/III data list

• Refer to Data List Reference Table 

P.13A-372

.

a. Item No. 27: Power steering fluid pressure 

switch

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 8. Perform voltage measurement at C-119 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Engine: Idling

• Voltage between terminal No. 54 and earth.

OK: 

System voltage (Steering wheel: Stationary)
1 V or less (Steering wheel: Turned)

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 9 .

STEP 9. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 10 .

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>

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-202

STEP 10. Check harness between A-40 (terminal 
No. 1) power steering fluid pressure switch 
connector and C-119 (terminal No. 54) 
engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connector A-13

*1 

or C-31

*2

, and repair if necessary.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Replace the power steering fluid pressure 

switch.

NO : 

Repair the damaged harness wire.

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

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair or replace the connector.

1

AK502001AB

Connector: A-40

Harness side 
connector

A-40 (B)

AK501994

65

43
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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>

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>