Mitsubishi Galant. Manual — part 159
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-317
INSPECTION PROCEDURE 3: The Service Engine Soon/Malfunction Indicator Lamp Does Not
Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.
AK000478
24 25
21
26 27
22 23
29 30 3132
28
35 36
34
33
3
2
4 5 6
1 2 3
4 5 6
BLA
CK-
WHITE
1
BR
O
WN-
BLA
CK
BR
O
WN-
BLA
CK
BLA
CK-
WHITE
C-78
(MU801457)
R
IG2
ST
LOCK
ACC
IG1
C-73
MU801331
IGNITION
SWITCH
C-58
2
6
6
JUNCTION
BLOCK
29
C-29
4 5
1
6 7
2 3
10 1112
9
15 16
14
13
C-30
6
C-17
SERVICE ENGINE SOON/
MALFUNCTION
INDICATOR LAMP
C-39
(MU803784)
POWERTRAIN CONTROL
MODULE(PCM)
21
22
1
6
4
5
11
10
12 13
15
17
16
14
19
18
8 9
7
20
2 3
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
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
8
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-318
CIRCUIT OPERATION
•
The service engine soon/malfunction indicator
lamp power is supplied from the ignition switch.
•
The PCM controls the ground of the service
engine soon/malfunction indicator lamp by
turning the power transistor in the PCM ON and
OFF.
COMMENT
•
The PCM causes the service engine soon/
malfunction indicator 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.
•
Defective service engine soon/malfunction
indicator lamp circuit.
AK000633AC
CONNECTOR:C-29
AK000566AB
CONNECTOR:C-17
AK000631AC
CONNECTOR:C-73
AK000280
CONNECTOR : C-39
PCM
AW
AK000631AB
CONNECTOR:C-78
AK000634 AB
CONNECTOR:C-58
AK000633AD
CONNECTOR:C-30
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-319
•
Malfunction of the PCM.
DIAGNOSIS
Required Special Tool:
MB991502:Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 16:
Power Supply Voltage.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before.
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 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.
STEP 3. Check connector C-29,C-30 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.
AC003081 AB
16 PIN
MB991502
AK000633
C-29
C-30
CONNECTORS:C-29,C-30
AG
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-320
STEP 4. Check the power supply voltage at combination
meter harness side connector C-29.
(1) Disconnect the connector C-29 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 29 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-73 and C-78 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-58 terminal 2
and combination meter connector C-29 terminal 29
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 5. Check connector C-39 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then confirm that
the malfunction symptom is eliminated.
AK000635
C-29 HARNESS
SIDE CONNECTOR
36 35 3433 32 31302928
27 26252423 22 21
AB
AK000280
CONNECTOR : C-39
PCM
AW
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