Mitsubishi Lancer Evolution IX. Manual — part 461
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-319
STEP 15. Check connector: D-12 fuel pump
connector.
Q: Is the check result normal?
YES :
Go to Step 16 .
NO :
Repair or replace the connector.
STEP 16. Perform voltage measurement at D-12
fuel pump connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 5 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 17 .
NO :
Check intermediate connectors C-113*
1
,
C-112*
2
C-123 and D-33, and repair if
necessary. If intermediate connector are
normal, check and repair harness between
B-121 (terminal No. 2) fuel pump resistor
connector and D-12 (terminal No. 5) fuel
pump connector.
• Check power supply line for
open/short circuit.
AK203611
1
2
3
4
5
AD
Connector: D-12
D-12 (GR)
Harness side
connector
AK203611
1
2
3
4
5
AD
Connector: D-12
D-12 (GR)
Harness side
connector
AK305259
1
2
Harness side connector
Connector: B-121
B-121(B)
B-121(B)
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-320
STEP 17. Perform resistance measurement at
D-12 fuel pump connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 4 and earth.
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Replace fuel pump.
NO :
Check intermediate connector D-34, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between D-12 (terminal No. 4) fuel
pump connector and body earth.
• Check earthing line for open circuit
and damage.
STEP 18. Check connector: B-120 fuel pump
relay (3) connector.
Q: Is the check result normal?
YES :
Go to Step 19 .
NO :
Repair or replace the connector.
STEP 19. Check fuel pump relay (3).
• Fuel pump relay (3) continuity check (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 20 .
NO :
Replace the fuel pump relay (3).
AK203611
1
2
3
4
5
AD
Connector: D-12
D-12 (GR)
Harness side
connector
AK305262
2 1
3
4
Harness side connector
Connector: B-120
B-120
B-120
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block’s
triangle marks
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-321
STEP 20. Perform voltage measurement at B-120
fuel pump relay (3) connector.
• Remove relay, and measure at junction block
side.
• Ignition switch: "ON"
• Voltage between terminal No. 2 and earth, and
No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 21 .
NO :
Check intermediate connector C-123, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-120 (terminal No. 2 and
No. 4) fuel pump relay (3) connector and
B-121 (terminal No. 1) fuel pump resistor
connector.
• Check power supply line for damage.
STEP 21. Connector check: C-119 engine-ECU
connector.
Q: Is the check result normal?
YES :
Go to Stop 22 .
NO :
Repair or replace the connector.
AK305262
2 1
3
4
Harness side connector
Connector: B-120
B-120
B-120
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block’s
triangle marks
AK305259
1
2
Harness side connector
Connector: B-121
B-121(B)
B-121(B)
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
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-322
STEP 22. Perform voltage measurement at C-119
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Disconnect C-121 (terminal No. 21) engine-ECU
connector and earth.
• Voltage between terminal No. 55 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 23 .
NO :
Check and repair harness between C-119
(terminal No.55) engine-ECU connector and
B-120 (terminal No.3) fuel pump relay (3)
connector.
• Check earthing line for open circuit
and damage.
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>
AK305262
2 1
3
4
Harness side connector
Connector: B-120
B-120
B-120
AB
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block’s
triangle marks
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