Mitsubishi Lancer Evolution IX. Manual — part 388
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-27
STEP 6. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
STEP 7. 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 short circuit.
Q: Is the check result normal?
YES :
Go to Step 8 .
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>
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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-28
STEP 8. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 12: Air flow sensor
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Replace the engine-ECU.
STEP 9. Perform voltage measurement at B-105
air flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Go to Step 10 .
STEP 10. Connector check: B-12X engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair 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
open/short circuit.
NO :
Repair or replace the connector.
STEP 11. Perform resistance measurement at
B-105 air flow sensor connector.
• Disconnect and measure at harness side.
• Resistance between terminal No. 5 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Go to Step 12 .
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
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
AK305005
3
4
5
1
2
6
7
AB
Connector : B-105
Harness side
connector
B-105(B)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-29
STEP 12. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Repair or replace the connector.
STEP 13. Check harness between B-105 (terminal
No. 5) air flow 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 8 .
NO :
Repair the damaged harness wire.
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)
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-30
STEP 14. 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.
• Ignition switch: "ON"
• Voltage between terminal No. 7 and earth.
OK: 6
− 9 V
Q: Is the check result normal?
YES :
Go to Step 17 .
NO :
Go to Step 15 .
STEP 15. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 16 .
NO :
Repair or replace the connector.
STEP 16. 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 short circuit.
Q: Is the check result normal?
YES :
Replace the air flow sensor.
NO :
Repair the damaged harness wire.
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)
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>
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