Mitsubishi Eclipse. Manual — part 313
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-745
INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.
AK201266
44 45
41
46 47
42 43
49 50 5152
48
55 56
54
53
3
2
4 5 6
1 2 3
4 5 6
GREEN
1
RED-
YELLO
W
RED-
YELLO
W
BLA
CK-
WHITE
R
IG2
ST
LOCK
ACC
IG1
C-111
MU801331
IGNITION
SWITCH
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit
C-87
2
6
25
JUNCTION
BLOCK
52
C-41
41
C-28
MALFUNCTION INDICATOR LAMP
(SERVICE ENGINE SOON OR
CHECK ENGINE LAMP)
C-53 <M/T>
(MU803771)
C-50 <A/T>
(MU803784)
ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>
21
36 <M/T>
22 <A/T>
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
34
33
32
36
35
37
42
45
31
39
38
46
40 41
43 44
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
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
23
7.5A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-746
.
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.
.
AK300072
CONNECTOR: C-41
AB
C-41 (B)
AK300119
CONNECTOR: C-28
AB
C-28
AK300124
CONNECTOR: C-111
AB
C-111
AK300060
ECM
CONNECTOR: C-53 <M/T>
AH
C-53 (G)
AK300060AD
C-50 (GR)
PCM
CONNECTOR: C-50 <A/T>
AK300123
CONNECTOR: C-108
AB
C-108
AK300116
CONNECTOR: C-87
AB
C-87
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-747
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the malfunction indicator lamp
(SERVICE ENGINE SOON or Check Engine
Lamp).
• Defective malfunction indicator lamp (SERVICE
ENGINE SOON or check engine lamp) circuit.
DIAGNOSIS
Required Special Tools:
• MB991958 (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 battery positive voltage (approximately 12 volts)
present?
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-748
STEP 3. Check connector C-41 at the combination meter
for damage.
Q: Is the connector in good condition?
YES : Go to step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 4. Measure the power supply voltage at combination
meter harness side connector C-41.
(1) Disconnect the connector C-41 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 52 and ground.
• 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 5.
NO : Check harness connectors C-108 and C-111 at
intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection
. If intermediate
connectors are in good condition, repair harness wire
between ignition switch connector C-87 (terminal No.
2) and combination meter connector C-41 (terminal
No. 52) because of open circuit. Then confirm that the
malfunction symptom is eliminated.
AK300741
44
45
41
46
47
42
43
49
50
51
52
48
55
56
54 53
CONNECTOR: C-41
AB
C-41 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300741
44
45
41
46
47
42
43
49
50
51
52
48
55
56
54 53
CONNECTOR: C-41
AB
C-41 (B)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000364AE
56 55 54 53 52 5150 49 48
47 46 45 44 43 42 41
C-41 HARNESS
CONNECTOR:
COMPONENT SIDE
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