Mitsubishi Lancer Evolution IX. Manual — part 456
![](/vehicles/winoney/wruvea/ger/inouceenach.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-299
STEP 4. Perform voltage measurement at C-121
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 18 and earth.
OK: 4.9
− 5.1 V
Q: Is the check result normal?
YES :
Replace the fan controller.
NO :
Go to Step 5 .
STEP 5. Connector check: A-17 fan controller
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace the connector.
STEP 6. Check harness between A-17 (terminal
No. 2) fan controller connector and C-121
(terminal No. 18) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-13*
1
or 31*
2
, and repair if necessary.
• Check output line for open circuit.
Q: Is the check result normal?
YES :
Replace the fan controller.
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>
AK305256
1
2
3
AB
Connector: A-17
A-17 (GR)
Harness side connector
AK305256
1
2
3
AB
Connector: A-17
A-17 (GR)
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/groy.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-300
Inspection Procedure 22: Poor A/C Performance
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by short /overcharged
A/C refrigerant, failed A/C control system, failed
fan control system or other faults.
PROBABLE CAUSES
• Short or overcharged A/C refrigerant
• Failed A/C compressor
• Failed fan controller
• Failed A/C-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III diagnosis code
Q: Diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. A/C compressor magnet clutch
operation check.
• Engine: Idling
• A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is 25
°C
or less
OK:
Magnet clutch active (when A/C is ON)
Magnet clutch inactive (when A/C is OFF)
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 3 .
STEP 3. M.U.T.-II/III data list
• Item No. 28: A/C switch
a. Engine: Idling
b. A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is
25
°C or less
OK:
ON (when A/C is ON)
OFF (when A/C is OFF)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check A/C switch (Refer to Inspection
Procedure 27
).
STEP 4. M.U.T.-II/III data list
• Item No. 49: A/C relay
a. Engine: Idling
b. A/C set temperature:
Maximum Hot when temperature in cabin is
25
°C or less
Maximum Cool when temperature in cabin is
25
°C or more
OK:
ON (when A/C is ON)
OFF (when A/C is OFF)
Q: Is the check result normal?
YES :
Check A/C system (Refer to GROUP 55
−
Troubleshooting
).
NO :
Check A/C compressor relay (Refer to
Inspection procedure 28
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-301
STEP 5. Check charged amount of A/C
refrigerant.
• Check charged amount of A/C refrigerant (Refer
to GROUP 55
− On-vehicle Service
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Adjust charged amount of A/C refrigerant.
STEP 6. M.U.T.-II/III actuator test
• Item No. 21: Fan controller
OK: Fan motor rotates.
Q: Is the check result normal?
YES :
Check A/C load signal system (Refer to
Inspection Procedure 29
NO :
Check radiator fan control relay system
(Refer to Inspection Procedure 25
).
![](/vehicles/winoney/wruvea/ger/gres.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-302
Inspection Procedure 23: Engine-ECU Power Supply, Engine Control Relay, Ignition Switch-IG1
System
1
2
3
4
AK501828
1 2 3
4 5 6
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
80
87
81
94
85
82
84
93
86
98
99
74
92
73
83
88
91
95
97
96
100
89
78
71
90
76 77
75
72
79
R
IG2
ST
LOCK
ACC
IG1
8
20A
8
7.5A
Battery
C-208
Ignition switch
2
1
4
J/B
99
60
Engine
control
relay
B-12X
28
31
30
57
Back-up
power supply
59
47
46
58
Power
supply
Engine-ECU
Relay box
W
B-Y
B-Y
B-Y
R-Y
B-R
R-B
B-W
R-Y
R-Y
R
Power supply and ignition switch-IG circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple
AB
W
6 <A-13> (*1) or
13 <C-31> (*2)
1
2
4
3
L (*1) or
B-W (*2)
J/C (6)
C-105
C-119
(MU803782)
C-117
(MU803783)
B
B
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
B
C-210
C-123
6
C-211
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