Mitsubishi Lancer Evolution IX. Manual — part 389
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-31
STEP 17. Perform voltage measurement at B-105
air flow sensor connector.
• Use special tool test harness (MB991709) to con-
nect connector, and measure at pick-up harness.
• Transmission: Neutral
• Voltage between terminal No. 7 and earth.
OK:
0
− 1 V (Engine: Idling)
6
− 9 V (Engine: 3,000 r/min.)
Q: Is the check result normal?
YES :
Go to Step 20 .
NO :
Go to Step 18 .
STEP 18. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 19 .
NO :
Repair or replace the connector.
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-32
STEP 19. Check harness between B-105 (terminal
No. 7) air flow sensor connector and C-121
(terminal No. 19) engine-ECU connector.
• Check reset signal line for open circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair the damaged harness wire.
STEP 20. Perform output wave pattern
measurement at B-105 air flow 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. 3 and earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to
) and noise should not be
displayed in the waveform.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 21 .
STEP 21. Replace the air flow sensor.
• After replacing the air flow sensor, re-check the
trouble symptoms.
Q: Is the check result normal?
YES :
Go to Step 22 .
NO :
The check is end.
STEP 22. Connector check: B-12X engine control
relay connector
Q: Is the check result normal?
YES :
Go to Step 23 .
NO :
Repair or replace the connector.
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
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>
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
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-33
STEP 23. Check harness between B-105 (terminal
No. 4) air flow 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 24 .
NO :
Repair the damaged harness wire.
STEP 24. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 25 .
NO :
Repair or replace the connector.
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
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-34
STEP 25. Check harness between B-105 (terminal
No. 3) air flow sensor connector and C-119
(terminal No. 61) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 26 .
NO :
Repair the damaged harness wire.
STEP 26. Connector check: C-121 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-121 (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>
AK501995
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
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>
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
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