Mitsubishi Eclipse. Manual — part 593
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-915
NOTE: Check harness after checking intermediate connectors
C-77 and C-28. If intermediate connectors are damaged, repair
or replace them. Refer to GROUP 00E, Harness Connector
Inspection
. Then check that the malfunction is elimi-
nated.
Q: Is the harness wire in good condition?
YES : Refer to, INSPECTION PROCEDURE 29
− Power
Supply System and Ignition Switch
− IG System
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-916
INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVIVE ENGINE SOON or Check
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.
AK301716
3
2
4 5 6
1 2 3
4 5 6
GREEN
1
RED-
YELLO
W
RED-
YELLO
W
BLA
CK-
WHITE
R
IG2
LOCK
ACC
IG1
C-111
MU801331
IGNITION
SWITCH
C-87
2
6
25
JUNCTION
BLOCK
52
41
MALFUNCTION INDICATOR LAMP
(SERVICE ENGINE SOON OR CHECK ENGINE LAMP)
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
21
22
ST
44 45
41
46 47
42 43
49 50 5152
48
55 56
54
53
C-41
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
C-51 <M/T>, C-52 <A/T>
(MU803784)
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
3132 33
34 35
1
10
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit
1
6
4 5
11
10
1213
15
17
16
14
19
18
8 9
7
20
2 3
2122 23 2425 26 27 28
C-108
7.5A
23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-917
.
CIRCUIT OPERATION
• The malfunction indicator lamp (SERVICE
ENGINE SOON or Check Engine Lamp) power is
supplied from the ignition switch.
• The ECM <M/T> or PCM <A/T> controls the
ground of the malfunction indicator lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) by
turning the power transistor in the ECM <M/T> or
PCM <A/T> ON and OFF.
.
COMMENT
• The ECM <M/T> or PCM <A/T> causes the mal-
function indicator lamp (SERVICE ENGINE
SOON or Check Engine Lamp) to illuminate for 5
seconds immediately after the ignition switch is
turned to the "ON" position occurred.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Burnt-out bulb.
AK300072
CONNECTOR: C-41
AB
C-41 (B)
AK300124
CONNECTOR: C-111
AB
C-111
AK300123
CONNECTOR: C-108
AB
C-108
AK300116
CONNECTOR: C-87
AB
C-87
AK300091
CONNECTOR: C-51 <M/T>
ECM
AF
C-51 (GR)
AK300244
CONNECTOR: C-52 <A/T>
AC
PCM
C-52 (GR)
AK300119
CONNECTOR: C-28
AB
C-28
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-918
• Defective malfunction indicator lamp (SERVICE
ENGINE SOON or Check Engine Lamp) circuit.
• Malfunction of the ECM <M/T> or PCM <A/T>.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check data list item 16:
Power Supply Voltage.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before. con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item
16, Power Supply Voltage.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 2.
NO : Refer to INSPECTION PROCEDURE 29
− Power
Supply System and Ignition Switch
− IG System
STEP 2. Check the burned-out bulb.
Q: Is the valve normal?
YES : Go to step 3.
NO : Replace the bulb. Then confirm that the malfunction
symptom is eliminated.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
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