Mitsubishi Lancer Evolution IX. Manual — part 411
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-119
STEP 4. Perform voltage measurement at B-18
No. 3 injector connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 5 .
STEP 5. Connector check: B-12X engine control
relay connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
STEP 6. Check injector resistor itself.
• Check injector resistor itself (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Replace the injector resistor.
STEP 7. Check harness between B-119 (terminal
No. 5) injector resistor connector and B-18
(terminal No. 1) No. 3 injector connector.
• Check power supply line for open/short circuit.
AK305012
1
2
Connector : B-18
Harness side connector
B-18(B)
AE
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
AK305016
1
2
3
4
5
6
AB
Harness side
connector
B-119(B)
B-119(B)
Connector : B-119
<L.H.drive vehicles>
<R.H.drive vehicles>
AK305012
1
2
Connector : B-18
Harness side connector
B-18(B)
AE
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-120
Q: Is the check result normal?
YES :
Check intermediate connector C-105, and
repair if necessary. If intermediate
connector are normal, check and repair
harness between B-119 (terminal No. 3)
injector resistor connector and B-12X
(terminal No. 4) engine control relay
connector.
• Check power supply line for
open/short circuit.
NO :
Repair the damaged harness wire.
STEP 8. Check harness between B-119 (terminal
No. 5) injector resistor connector and B-18
(terminal No. 1) No. 3 injector connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair the damaged harness wire.
STEP 9. Check harness between B-119 (terminal
No. 3) injector resistor connector and B-12X
(terminal No. 4) engine control relay connector.
NOTE: Before checking harness, check intermediate
connector C-105, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair the damaged harness wire.
AK305016
1
2
3
4
5
6
AB
Harness side
connector
B-119(B)
B-119(B)
Connector : B-119
<L.H.drive vehicles>
<R.H.drive vehicles>
AK305012
1
2
Connector : B-18
Harness side connector
B-18(B)
AE
AK305016
1
2
3
4
5
6
AB
Harness side
connector
B-119(B)
B-119(B)
Connector : B-119
<L.H.drive vehicles>
<R.H.drive vehicles>
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-121
STEP 10. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair or replace the connector.
STEP 11. Check harness between B-18 (terminal
No. 2) No. 3 injector connector and C-121
(terminal No. 24) engine-ECU connector.
• Check output line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 12 .
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>
AK305012
1
2
Connector : B-18
Harness side connector
B-18(B)
AE
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-122
STEP 12. Perform signal wave pattern
measurement at C-121 engine-ECU connector
(Using an oscilloscope).
• Engine: Idling
• Transmission: Neutral
• Voltage between terminal No. 24 and earth.
OK: Waveform should be display on Inspec-
tion procedure using an oscilloscope (Refer
to
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.
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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