Mitsubishi Lancer Evolution IX. Manual - part 424

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-171

STEP 10. Perform resistance measurement at 
B-106 exhaust 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-106 (terminal 
No. 1) 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.

AK501999

1

2

3

AB

Connector: B-106

B-106 (B)

Harness side 
connector

AK501995

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3

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30

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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>

AK501999

1

2

3

AB

Connector: B-106

B-106 (B)

Harness side 
connector

AK501995

2

3

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5

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9

11

12

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30

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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-172

STEP 13. Perform output wave pattern 
measurement at B-106 exhaust 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-106 (terminal 
No. 3) exhaust 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.

AK501999

1

2

3

AB

Connector: B-106

B-106 (B)

Harness side 
connector

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

AK501999

1

2

3

AB

Connector: B-106

B-106 (B)

Harness side 
connector

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-173

STEP 16. Connector check: C-119 and C-121 
engine-ECU connectors

Q: Is the check result normal? 

YES : 

Go to Step 17 .

NO : 

Repair or replace the connector.

STEP 17. Check harness between B-106 (terminal 
No. 2) exhaust camshaft position sensor 
connector and C-119 (terminal No. 50) 
engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 18 .

NO : 

Repair the damaged harness wire.

AK501998

65

43
50

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49

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60

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64

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68

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66

52 51

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10

AB

Connector: C-119, C-121

C-119 (GR)

C-121 (GR)

C-119 (GR)

C-121 (GR)

C-121 Harness side connector

C-119 Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK501999

1

2

3

AB

Connector: B-106

B-106 (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-174

STEP 18. Check harness between B-106 (terminal 
No. 1) exhaust camshaft position sensor 
connector and C-121 (terminal No. 34) 
engine-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 19 .

NO : 

Repair the damaged harness wire.

STEP 19. Check the exhaust camshaft position 
sensing cylinder.

Q: Is the check result normal? 

YES : 

Go to Step 20 .

NO : 

Replace the exhaust camshaft position 
sensing cylinder.

STEP 20. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace the exhaust camshaft position 

sensor.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

AK501999

1

2

3

AB

Connector: B-106

B-106 (B)

Harness side 
connector

AK501995

2

3

4

5

6

7

8

9

11

12

13

14

15

16

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18

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20

30

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24

25

26

27

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>