Mitsubishi Eclipse. Manual — part 615
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1003
NOTE: Check harness after checking intermediate connector
B-13. If intermediate connector is damaged, repair or replace
them. Refer to GROUP 00E, Harness Connector Inspection
. Then check that the malfunction is eliminated.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then confirm that the
malfunction symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
INSPECTION PROCEDURE 27: Incorrect Idle Speed When the A/C is Operating (A/C Switch 2 Signal)
AK000714
BL
UE-
WHITE
BL
UE-
WHITE
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
65 <M/T>
61 <A/T>
33
AUTOMATIC COMPRESSOR CONTROLLER
C-28
7 8
5
3 4
35
34
10 11 12
2122 23 24
13 14 15
25 26 27
16
28
17
18 19 20
29
30 31
32 33
36 37
38
9
1 2
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
C-58 <M/T>
(MU803782)
C-55 <A/T>
(MU803781)
42 43
48 49 50 51 52 53 54 55 56 57
46
45
44
58 59
60 61 62 63
64 65 66
47
41
A/C Switch 2 Signal
AK300244
CONNECTOR: C-55 <A/T>
AG
PCM
C-55 (GR)
AK300091
CONNECTOR: C-58 <M/T>
ECM
AC
C-58 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1004
.
CIRCUIT OPERATION
• The ECM <M/T> or PCM <A/T> increases the
engine idle speed by driving the IAC motor when
the automatic compressor-ECU sends a "A/C on"
signal to the module.
• The automatic compressor-ECU detects how the
air conditioning is applying load to the engine,
and converts the information to a voltage signal
(High voltage = low load, Low voltage = high
load). This voltage signal is called "A/C switch 2
signal". The ECM <M/T> or PCM <A/T> receives
this A/C switch 2 signal from the automatic com-
pressor controller through terminal No. 65 <M/T>
or terminal No. 61 <A/T>, and determines the
idle-up speed according to the high or low air
conditioning load.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the A/C control system.
• Open or shorted circuit, or improper connector
contact.
• ECM <M/T> or PCM <A/T> failed.
AK300119
CONNECTOR: C-28
AB
C-28
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1005
DIAGNOSIS
STEP 1. Check connector C-58 at ECM <M/T> or connector
C-55 at PCM <A/T> for damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK300748
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
CONNECTOR: C-58 <M/T>
AB
C-58 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300462
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
CONNECTOR: C-55 <A/T>
C-55 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-1006
STEP 2. Check the output voltage at ECM harness side
connector C-58 <M/T> or PCM harness side connector
C-55 <A/T>.
(1) Disconnect the connector C-58 <M/T> or C-55 <A/T> and
measure at the harness side.
(2) Start the engine and run at idle.
(3) Turn the A/C switch "ON".
AK300462
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
CONNECTOR: C-55 <A/T>
C-55 (GR)
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AK300748
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
CONNECTOR: C-58 <M/T>
AB
C-58 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
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