Mitsubishi Galant (2004+). Manual — part 1031
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-941
13A
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Comunication with All
Systems Is Not Possible.)
1
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
AK303912
RED-BLA
CK
BLA
CK
BLA
CK
RED
12
1
5
16
C-125
MU803797
C-211
DATA LINK
CONNECTOR
4
JUNCTION
BLOCK
FUSIBLE
LINK (1)
C-216
MU801403
Data Link Connector Circuit
10
15A
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AK303913AB
CONNECTOR: C-125
C-125 (B)
DATA LINK CONNECTOR
AK303914AB
CONNECTOR: C-216
C-216 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-942
.
CIRCUIT OPERATION
• A battery positive voltage is applied on the data
link connector power terminal (terminal No. 16).
The ground terminals (terminal No. 4, No. 5) are
grounded to the vehicle body.
.
COMMENT
• The cause is probably a defect in power supply
system (including ground) for the on-board diag-
nostic test mode line.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Malfunction of the data link connector.
• Damaged harness wire.
DIAGNOSIS
STEP 1. Measure the power supply voltage at data link
connector C-125.
(1) Measure voltage between terminal No. 16 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to step 2.
NO : Check harness connectors C-211, C-216 at
intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection
. If intermediate
connector C-211, C-216 are in good condition, repair
an open circuit between fusible link (1) and data link
connector C-125 (terminal No. 16). Then confirm that
the malfunction symptom is eliminated.
AK303915AB
CONNECTOR: C-211
C-211
AK303916
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AB
CONNECTOR: C-125
HARNESS CONNECTOR:
COMPONENT SIDE
C-125 (B)
AKX01430
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
C-125 HARNESS
CONNECTOR:
COMPONENT SIDE
AX
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-943
STEP 2. Check the continuity at data link connector C-125.
(1) Check for the continuity between terminal No. 4, No. 5 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Replace the scan tool. Then confirm that the
malfunction symptom is eliminated.
NO : Repair an open circuit or harness damage between
data link connector C-125 (terminal No. 4, No. 5) and
ground. Then confirm that the malfunction symptom is
eliminated.
AK303916
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AB
CONNECTOR: C-125
HARNESS CONNECTOR:
COMPONENT SIDE
C-125 (B)
AKX01431
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
C-125 HARNESS
CONNECTOR:
COMPONENT SIDE
AV
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-944
INSPECTION PROCEDURE 2: Scan Tool Communication with PCM Is Not Possible.
1 2 3 4
5 6 7
8 9 10 11
12 13 14
15 16 17 18
AK303917
ORANGE-BLUE
ORANGE-BLUE
15
7
DATA LINK
CONNECTOR
13
POWERTRAIN
CONTROL
MODULE (PCM)
C-29
C-125
MU803797
Data Link Connector Circuit
B-19
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AK303913AB
CONNECTOR: C-125
C-125 (B)
DATA LINK CONNECTOR
AK303147
CONNECTOR: B-19
PCM
AB
AIR CLEANER
B-19 (B)
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