Mitsubishi Lancer Evolution IX. Manual — part 448
![](/vehicles/winoney/wruvea/ger/kia.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-267
STEP 18. Check harness between ignition coil
connector terminal No. 2 of each cylinder and
body earth.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES :
Check and repair harness between ignition
coil connector terminal No. 3 of each
cylinder and C-121 engine-ECU connector.
• Check signal line for open/short
circuit and damage.
NO :
Repair the damaged harness wire.
STEP 19. Check spray condition of injector.
• Check each injector for spray condition (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 20 .
NO :
Replace the injector.
STEP 20. Check compression pressure.
• Check compression pressure (Refer to GROUP
11A
− On-vehicle Service
).
Q: Is the check result normal?
YES :
Go to Step 21 .
NO :
Repair.
STEP 21. Check EGR control solenoid valve
itself.
• Check EGR control solenoid valve itself (Refer to
GROUP 17
− Emission Control System −
Exhaust Gas Recirculation (EGR) System
).
Q: Is the check result normal?
YES :
Go to Step 22 .
NO :
Replace the EGR control solenoid valve.
STEP 22. Check EGR valve itself.
• Check EGR valve itself (Refer to GROUP 17 −
Emission Control System
− Exhaust Gas Recir-
culation (EGR) System
).
Q: Is the check result normal?
YES :
Go to Step 23 .
NO :
Replace the EGR valve.
STEP 23. Replace the engine-ECU.
• After replacing the engine-ECU, re-check the
trouble symptoms.
Q: Does trouble symptom persist?
YES :
Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO :
The check is end.
AK305047
1
2
3
Connector : B-103, B-114
B-114(GR)
B-103(GR)
AB
Harness side
connector
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>
![](/vehicles/winoney/wruvea/ger/youshive.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-268
Inspection Procedure 8: Unstable Idling (Rough Idling, hunting), Improper Idling Speed (Too High or
too Low), Engine Stalls During Idling (Die Out)
COMMENTS ON TROUBLE SYMPTOM
• Probable causes can be widely found in ignition
system, air-fuel ratio control system, idle speed
control system, fuel system, etc. A sudden
engine stall is possibly caused by poor connector
contact.
PROBABLE CAUSES
• Failed ignition system
• Failed fuel system
• Failed air-fuel ratio control system
• Failed idle speed control system
• Failed intake/exhaust system
• Failed emission gas cleaning system
• Throttle valve body fouled
• Timing belt out of place
• Compression pressure improper
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check battery condition.
Q: Has the battery terminal been disconnected?
YES :
After warm-up engine, idle for about 10
minutes.
NO :
Go to Step 2 .
STEP 2. M.U.T.-II/III diagnosis code
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 3 .
STEP 3. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 12: Air flow sensor
b. Item No. 13: Intake air temperature sensor
c. Item No. 14: Throttle position sensor
d. Item No. 21: Engine coolant temperature sen-
sor
e. Item No. 25: Barometric pressure sensor
Q: Are the check results normal?
YES :
Go to Step 4 .
NO :
Perform the diagnosis code classified check
Procedure for the sensor that has shown an
abnormal data value (Refer to Inspection
Chart for Diagnosis Codes
).
STEP 4. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item 27: Power steering fluid pressure switch
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Check power steering fluid pressure switch
system (Refer to Code No. P0551
).
STEP 5. Check idle speed control servo for
operating sound.
• Check idle speed control servo for operating
sound (Refer to
).
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Check idle speed control servo system
(Refer to Code No. P0505
STEP 6. Check throttle body (throttle valve
portion) for contamination.
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Clean throttle body (throttle valve portion)
(Refer to
).
STEP 7. Check air intake from intake hose and
intake manifold.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
STEP 8. Check injector for operating sound.
• Check injector for operating sound (Refer to
).
Q: Can operating sound be heard?
YES :
Go to Step 9 .
NO :
Check the injector system of the defective
cylinder.
(Refer to Code No. P0201: No. 1 injector
).
(Refer to Code No. P0202: No. 2 injector
).
(Refer to Code No. P0203: No. 3 injector
).
(Refer to Code No. P0204: No. 4 injector
).
![](/vehicles/winoney/wruvea/ger/jurerig.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-269
STEP 9. Check timing marks of timing belt.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Align timing marks.
STEP 10. M.U.T.-II/III data list
• Refer to Data List Reference Table
.
a. Item No. 11: Oxygen sensor (front)
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Check the oxygen sensor (front) system
(Refer to Code No. P0130
STEP 11. Perform voltage measurement at C-119
engine-ECU.
• Measure engine-ECU terminal voltage.
• Ignition switch: "ON"
• Voltage between terminal No. 46 and earth, also
between terminal No. 58 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Go to Step 12 .
STEP 12. Connector check: C-119 engine-ECU
connector
Q: Is the check result normal?
YES :
Check and repair harness between C-119
(terminal No. 46 and No. 58) engine-ECU
connector and body earth.
• Check earthing line for open circuit
and damage.
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>
![](/vehicles/winoney/wruvea/ger/zeveea.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-270
STEP 13. Perform voltage measurement at C-121
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling after warm-up
• Transmission: Neutral
• Radiator fan: Not operating
• Voltage between terminal No. 8 and earth.
OK: Switching the head lamps to ON from
OFF causes the voltage to increase by 0.2
−
3.5 V.
Q: Is the check result normal?
YES :
Go to Step 16 .
NO :
Go to Step 14 .
STEP 14. Connector check: C-121 engine-ECU
connector and B-25 alternator connector.
Q: Is the check result normal?
YES :
Go to Step 19 .
NO :
Repair or replace the connector.
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>
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>
AK305036
M
2
1
3
4
Harness side
connector
AB
Connector : B-25
B-25(GR)
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