Mitsubishi Lancer Evolution IX. Manual — part 414
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-131
Judgment Criterion
• Surge voltage cannot be detected within 1 sec-
onds from the time when the waste gate solenoid
valve has changed from ON to OFF.
PROBABLE CAUSES
• Failed waste gate solenoid valve
• Open/short circuit in waste gate solenoid valve
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III actuator test
• Item No. 12: Waste gate solenoid valve
OK: Operating sound can be heard and the
valve vibrates.
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
NO :
Go to Step 2 .
STEP 2. Connector check: B-26 waste gate
solenoid valve connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform resistance measurement at B-26
waste gate solenoid valve connector.
• Disconnect connector, and measure at solenoid
valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 29
− 35 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Replace the waste gate solenoid valve.
STEP 4. Perform voltage measurement at B-26
waste gate solenoid valve 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 6 .
NO :
Go to Step 5 .
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-132
STEP 5. Connector check: B-12X engine control
relay connector
Q: Is the check result normal?
YES :
Check and repair harness between B-26
(terminal No. 1) waste gate solenoid valve
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 6. Perform voltage measurement at C-119
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 41 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 7 .
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
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-133
STEP 7. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between B-26
(terminal No. 2) waste gate solenoid valve
connector and C-119 (terminal No. 41)
engine-ECU connector.
• Check output line for open/short
circuit.
NO :
Repair or replace the connector.
STEP 8. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the 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>
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
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-134
STEP 9. Check harness between B-26 (terminal
No. 2) waste gate solenoid valve connector and
C-119 (terminal No. 41) engine-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair the damaged harness wire.
STEP 10. Check harness between B-26 (terminal
No. 1) waste gate solenoid valve 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 11 .
NO :
Repair the damaged harness wire.
STEP 11. M.U.T.-II/III actuator test
• Item No. 12: Waste gate solenoid valve
OK: Operating sound can be heard and the
valve vibrates.
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.
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
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>
1
2
AK305018
Connector : B-26
Harness side
connector
B-26(GR)
AB
AK305003
2
1
3
4
AB
Connector : B-12X
B-12X
Harness side
connector
Relay box’s
triangle marks
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