Mitsubishi Galant 9G. Manual — part 881
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-966
STEP 5. 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 : Replace the PCM. Then go to Step 6.
NO : It can be assumed that this malfunction is intermittent
of CAN bus line between PCM and A/C-ECU. Refer to
GROUP 00, How to Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
.
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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-967
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
AK400832
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-968
.
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-969
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
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