Mitsubishi Lancer Evolution IX. Manual — part 469
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-351
STEP 16. Check harness between battery and
B-13X (terminal No. 1) A/C compressor relay
connector.
NOTE: Before checking harness, check intermediate
connector A-29
*1
or C-31
*2
, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 17 .
NO :
Repair the damaged harness wire.
STEP 17. Check harness between B-13X
(terminal No. 4) A/C compressor relay connector
and A-36 (terminal No. 1) A/C compressor
assembly 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 A/C compressor magnet clutch.
NO :
Repair the damaged harness wire.
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
AK305270
2
1
3
4
B-13X
Connector: B-13X
AB
Harness side
connector
Relay box’s
triangle marks
AK502005
1
AB
Connector: A-36
Harness side
connector
A-36 (B)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-352
Inspection Procedure 29: A/C Load Signal System
OPERATION
• The A/C load signal is inputted to the
engine-ECU (terminal No. 65) from the A/C-ECU
(terminal No. 32).
FUNCTION
• The magnitude of the A/C compressor load is
detected and input to the engine-ECU. The
engine-ECU provides A/C idle up control accord-
ing to the A/C compressor load condition.
PROBABLE CAUSES
• Failed A/C-ECU
• Open/short circuit in A/C load signal circuit or
loose connector contact
• Failed engine-ECU
AK501834
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
21
29
22
30
23
31
24
32
25
33
26
34
27
35
28
36
65
Engine-ECU
A/C-ECU
A/C load signal circuit
G-Y
G-Y
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
C-37
(MU801584)
C-119
(MU803782)
32
5<C-124>
(*1) or 4<C-122> (*2)
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-353
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at C-121
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling
• A/C switch: ON (A/C compressor in driven state)
• Voltage between terminal No. 65 and earth
OK:
1 V or less (when the A/C is under low load)
System voltage (when the A/C is under high
load)
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Go to Step 4 .
STEP 2. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-354
STEP 4. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. Perform voltage measurement at C-37
A/C-ECU connector.
• Measure A/C-ECU terminal voltage.
• Engine: Idling
• A/C switch: ON (A/C compressor in driven state)
• Voltage between terminal No. 32 and earth
OK: System voltage (when the A/C is under
high load)
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector Check: C-37 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
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>
AK502007
28
36
27
35
26
34
25
33
24
32
23
31
22
30
21
29
AB
C-37 (B)
Harness side
connector
Connector: C-37
AK502007
28
36
27
35
26
34
25
33
24
32
23
31
22
30
21
29
AB
C-37 (B)
Harness side
connector
Connector: C-37
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