Mitsubishi Lancer Evolution IX. Manual — part 431
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-199
STEP 3. Perform voltage measurement at C-119
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Ignition switch: "ON"
• Voltage between terminal No. 54 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Go to Step 5 .
STEP 4. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check intermediate connector A-13
*1
or
C-31
*2
, and repair if necessary. If
intermediate connector is normal, check and
repair harness between A-40 (terminal No.
1) power steering fluid pressure switch
connector and C-119 (terminal No. 54)
engine-ECU connector.
• Check output line for open circuit.
NO :
Repair or replace the connector.
AK501994
65
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61
64
46
47
58
59
67
68
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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>
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
AK502001AB
Connector: A-40
Harness side
connector
A-40 (B)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-200
STEP 5. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
STEP 6. Check harness between A-40 (terminal
No. 1) power steering fluid pressure switch
connector and C-119 (terminal No. 54)
engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-13
*1
or C-31
*2
, and repair if necessary.
• Check output line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 7 .
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>
1
AK502001AB
Connector: A-40
Harness side
connector
A-40 (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-201
STEP 7. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 27: Power steering fluid pressure
switch
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 8. Perform voltage measurement at C-119
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling
• Voltage between terminal No. 54 and earth.
OK:
System voltage (Steering wheel: Stationary)
1 V or less (Steering wheel: Turned)
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Go to Step 9 .
STEP 9. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10 .
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>
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-202
STEP 10. Check harness between A-40 (terminal
No. 1) power steering fluid pressure switch
connector and C-119 (terminal No. 54)
engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-13
*1
or C-31
*2
, and repair if necessary.
• Check output line for damage.
Q: Is the check result normal?
YES :
Replace the power steering fluid pressure
switch.
NO :
Repair the damaged harness wire.
STEP 11. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
1
AK502001AB
Connector: A-40
Harness side
connector
A-40 (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>
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>
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