Mitsubishi Eclipse. Manual — part 336
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-837
INSPECTION PROCEDURE 29: Power supply system and ignition switch
− IG system.
AK103263
6
2 3
4 5 6
GREEN
1
1
3
2
4
1
4
8
7
2
6
3
5
5
BLA
CK-
ORANGE
BLA
CK-
ORANGE
BLA
CK-
ORANGE
RED-WHITE
RED
RED
RED
WHITE-VIOLET
RED-
WHITE
RED-
WHITE
RED-
WHITE
RED-
WHITE
WHITE
WHITE
BLA
CK
BLA
CK
BLA
CK
BATTERY
Power Supply and Ignition Switch-IG Circuit
R
IG2
ST
LOCK
ACC
IG1
C-87
C-111
MU801331
IGNITION
SWITCH
2
6
1
82
<M/T>*3
98
<A/T>*5
C-07
MU801333
80
<M/T>*3
66
<A/T>*4
MFI
RELAY
1
2
4
3
38
<M/T>*2
49
<A/T>*4
BATTERY
BACK UP
12
<M/T>*1
41
<A/T>*4
25
<M/T>*1
47
<A/T>*4
POWER
SOURCE
26
<M/T>*1
48
<A/T>*4
13
<M/T>*1
42
<A/T>*4
NOTE
*1: ECM connector C-49 <M/T>
*2: ECM connector C-53 <M/T>
*3: ECM connector C-60 <M/T>
*4: PCM connector C-54 <A/T>
*5: PCM connector C-57 <A/T>
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
C-54 <A/T>
(MU803781)
C-60 <M/T>
(MU803772)
C-57 <A/T>
(MU803782)
C-53 <M/T>
(MU803771)
C-49 <M/T>
(MU803773)
3
8
9
20A
3
1
14
4
19
5
22
6
17
8
15
9
18
7
20
16
2
13
12
23 24 25 26
21
3
10 11
82
78
81
80
89 90 91 92
79
87
71
74
73
72
76
75
77
85
88
83 84
86
98
78
71
88 89
76 77
72
79
91
73
80
74
75
81
92
8283
93
8485
94
8687
9596
90
97
34
33
32
36
35
37
42
45
31
39
38
46
40 41
43 44
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
15 16
26 27 28 29
32 33 34
17 18 19 20 21 22 23 24 25
30 31
36 37
35
38
10
11 12 13
1 2 3
4 5 6 7 8 9
14
C-89
C-07
RELAY BOX
3 4
1 2
A-18X
1
6
4 5
11
10
12 13 14
8 9
7
2 3
C-112
MU801857
17
7.5A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-838
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the MFI
relay (terminals No. 3, No. 4).
• When the ignition switch is turned to the "ON"
position, the battery positive voltage is applied to
the ECM (terminal No. 82) <M/T> or PCM (termi-
nal No. 98) <A/T>. When the battery positive volt-
age is applied, the ECM <M/T> or PCM <A/T>
turns the power transistor in the ECM <M/T> or
PCM <A/T> "ON" and grounds the MFI relay coil.
With this, the MFI relay turns "ON" and the bat-
tery positive voltage is supplied to the ECM (ter-
minal No. 12, No. 25) <M/T> or PCM (terminal
No. 41, No. 47) <A/T> from the MFI relay (termi-
nal No. 1).
• Battery positive voltage is constantly supplied to
the ECM (terminal No. 80) <M/T> or PCM (termi-
nal No. 66) <A/T> as the backup power.
• The ECM (terminal No. 13, No. 26) <M/T> or
PCM (terminals No. 42, No. 48) <A/T> is
grounded to the vehicle body.
AK300060
ECM
CONNECTORS: C-49, C-53, C-60 <M/T>
AM
C-53 (G) C-60 (G)
C-49 (G)
AK300060
PCM
CONNECTORS: C-54, C-57 <A/T>
AI
C-57 (GR)
C-54 (GR)
AK300118
CONNECTOR: C-89
AC
C-89
AK300116
CONNECTOR: C-87
AB
C-87
AK300125
CONNECTOR: C-112
AB
C-112
AK300092
CONNECTOR: C-07
AB
C-07
AK300121
MFI RELAY
CONNECTOR: A-18X
AB
A-18X
AK300124
CONNECTOR: C-111
AB
C-111
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-839
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the ignition switch.
• Malfunction of the MFI relay.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Disconnected ECM <M/T> or PCM <A/T> ground
wire.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
STEP 1. Check connector A-18X at MFI relay 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.
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-840
STEP 2. Check the MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 2
and No. 3.
• There should be continuity. (approximately 70 ohms)
(3) Use jumper wires to connect MFI relay terminal No. 2 to the
positive battery terminal and terminal No. 3 to the negative
battery terminal.
(4) Check the continuity between the MFI relay terminals No. 1
and No. 4 while connecting and disconnecting the jumper
wire at the negative battery terminal.
• Should be less than 2 ohms. (Negative battery terminal
connected)
• Should be open loop. (Negative battery terminal discon-
nected)
(5) Install the MFI relay.
Q: Is the voltage normal?
YES : Go to Step 3.
NO : Replace the MFI relay. Then confirm that the
malfunction symptom is eliminated.
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
AK204164
1
2
3
4
MFI RERAY
SIDE
CONNECTOR
AB
1
2
3
4
AK203257
MFI RELAY SIDE
CONNECTOR
AB
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