Mitsubishi Galant 9G. Manual — part 1178
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1012
STEP 6. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the MFI-DTC has been deleted, read the MFI-DTC
again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1110 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1013
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with Scan Tool Is Not Possible. (Comunication with All
Systems Is Not Possible.)
AK400834
RED-BLA
CK
BLA
CK
RED
BLA
CK
12
1
5
16
C-125
MU803797
C-211
DATA LINK
CONNECTOR
4
JUNCTION
BLOCK
FUSIBLE
LINK (1)
1
C-216
MU801403
Data Link Connector Circuit
10
15A
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
AK303209AB
CONNECTOR: C-125
DATA LINK
CONNECTOR
C-125
ACCELERATOR
PEDAL
AK303210
CONNECTOR: C-216
C-216
AB
JUNCTION
BLOCK
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1014
.
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 and C-29 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 and C-29 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.
AK303227
CONNECTOR: C-211
C-211
AB
JUNCTION
BLOCK
AK303231
CONNECTOR: C-29
C-29
AB
AK303228
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AB
CONNECTOR: C-125
DATA LINK
CONNECTOR
C-125
ACCELERATOR
PEDAL
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303229
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
C-125 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1015
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.
AK303228
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AB
CONNECTOR: C-125
DATA LINK
CONNECTOR
C-125
ACCELERATOR
PEDAL
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303230
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
D-125 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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