Mitsubishi Lancer Evolution IX. Manual - part 436

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-219

STEP 5. Perform voltage measurement at C-119 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Disconnect B-124 intake camshaft position sen-

sor connector.

• Ignition switch: "ON" 

• Voltage between terminal No. 53 and earth.

OK: 4.9 

− 5.1 V

Q: Is the check result normal? 

YES : 

Go to Step 6 .

NO : 

Go to Step 7 .

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

Q: Is the check result normal? 

YES : 

Check and repair harness between B-124 

(terminal No. 2) intake camshaft position 
sensor connector and C-119 (terminal No. 
53) 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>

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK501994

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67

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52 51

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53

62

54

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57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-220

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.

STEP 8. Check harness between B-124 (terminal 
No. 2) intake camshaft position sensor connector 
and C-119 (terminal No. 53) 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. Check the trouble symptoms.

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

).

AK501994

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43
50

42
49

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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>

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
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>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-221

STEP 10. Perform resistance measurement at 
B-124 intake camshaft position sensor 
connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 1 and earth.

OK: 2 

Ω or less

Q: Is the check result normal? 

YES : 

Go to Step 13 .

NO : 

Go to Step 11 .

STEP 11. Connector check: C-121 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-124 (terminal 
No. 1) intake camshaft position sensor connector 
and C-121 (terminal No. 34) 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.

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK501995

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3

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34

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1

10

AB

Connector: C-121

C-121 (GR)

C-121 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK501995

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

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30

21

22

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25

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28

29

31

32

33

34

35

1

10

AB

Connector: C-121

C-121 (GR)

C-121 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-222

STEP 13. Perform output wave pattern 
measurement at B-124 intake camshaft position 
sensor connector (Using an oscilloscope).

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

nect connector, and measure at pick-up harness. 

• Engine: Idling

• Transmission: Neutral

• Voltage between terminal No. 2 and earth.

OK: Waveforms should be displayed on 
Inspection procedure using an oscilloscope 
(Refer to 

P.13A-385

), its maximum value 

should be 4.8 V or more, and its minimum 
value should be 0.6 V or less with no noise in 
waveform.

Q: Is the check result normal? 

YES : 

Go to Step 9 .

NO : 

Go to Step 14 .

STEP 14. Connector check: B-12X engine control 
relay connector.

Q: Is the check result normal? 

YES : 

Go to Step 15 .

NO : 

Repair or replace the connector.

STEP 15. Check harness between B-124 (terminal 
No. 3) intake camshaft position sensor connector 
and B-12X (terminal No. 4) engine control relay 
connector.

• Check power supply line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 16 .

NO : 

Repair the damaged harness wire.

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

AK502002

1

2

3

AB

Connector: B-124

B-124 (B)

Harness side 
connector

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks