Mitsubishi Lancer Evolution X. Manual — part 409
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-701
DTC SET CONDITIONS
Lgic Flow Chart
Check Condition
• Battery positive voltage is between 10 and 16.5
volts.
Judgement Criterion
• Unable to receive combination meter signals
through the CAN bus line for 4 seconds.
.
COMMENT
Current Trouble
• Some of the possible causes are a harness or
connector damage between the ECM and the
combination meter on the CAN bus line, a failure
in the combination meter power supply system, a
failure in the combination meter, or a failure in the
ECM.
AK604369
Start
Yes
Yes
Yes
No
No
No
Continuous failure
for specified time
Malfunction
End
Good
Monitoring
conditions
Communication status
fails
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-702
Past Trouble
• Proceed to troubleshoot based on a harness or
connector damage on the CAN bus line between
the ECM and combination meter, and a failure in
the combination meter power supply system.
Refer to "How to cope with past trouble" (Refer to
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points − How to Treat Past Trouble
NOTE: If a malfunction occurred in the past, a failure
cannot be discovered through the M.U.T.
−
III CAN
bus diagnosis even if there might be a problem with
the CAN bus. In this case, refer to GROUP 00, How
to Use Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
.
Furthermore, it is possible to narrow down the areas
of the possible failures from the DTCs that are output
by the ECUs, which are communicating on the CAN
bus (Refer to GROUP 54C, CAN bus line Diagnos-
tics Flow
).
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• CAN line harness damage or connector damage.
• Combination meter failed.
• ECM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, diagnose CAN bus
line.
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) Diagnose CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line normal?
YES : Go to Step 2.
NO : Repair the CAN bus line. Refer to GROUP 54C, Can
Bus Diagnostics Table
. Then go to Step 4.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-703
STEP 2. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the combination meter-DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the combination meter-DTC set?
YES : Refer to GROUP 54A, Chassis Electrical −
Combination Meter Assembly − Diagnostic Trouble
.
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC
again.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1180 set?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, ID Code
Registration Necessity Judgment Table <Vehicles
with KOS>
or GROUP 42C, ID Codes
Registration Judgment Table <Vehicles with WCM>
. Then go to Step 4.
NO : It can be assumed that this malfunction is intermittent
of CAN bus line between ECM and combination
meter. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points − How to
Cope with Intermittent Malfunctions
.
STEP 4. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC
again.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1180 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-704
SYMPTOM PROCEDURES
Inspection procedure 1: Communication with ECM only is not possible
71 72 73 74 75 76 77 78 79 80 81 82
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95 96 97 98 99
100 101 102 103 104
112 113 114
109
108
107
110 111
115 116
106
105
118
117
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AK900377
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
1
12 13 14 15 16 1718 19 20 2122 2324
2 3 4 5
6 7 8 9 10 11
2
8
7
6
5
4
3
11
21
20
19
18
17
16
15
14
13
12
9
22
1
10
1 2 3 4
5 6 7
15
14
13
12
11
10
9
8
1 2
FUSIBLE LINK
1
C-309
8
C-317
5
4
16
4
5
7
8
10
8
80
B-10
C-317
C-301
C-309
C-127
C-104
C-131
103
90
91
4
15
5
16
J/C (CAN3)
C-127
J/C (CAN2)
C-104
4
15
6
19
9
C-301
8
21
C-131
20
C-131
ENGINE
CONTROL
MODULE
DATA LINK
CONNECTOR
C-40
ETACS-ECU
6
14
10A
RED
WHITE
ORANGE
RED-
BLA
CK
BLACK
BLA
CK
BLA
CK
BLA
CK-WHITE
PINK
YELLO
W
-BLUE
YELLO
W
-BLUE
WHITE
GREEN
YELLO
W
-
GREEN
GREEN-
WHITE
YELLO
W
-
GREEN
YELLO
W
RED-
BLA
CK
GREEN
34
5
ANALOG
INTERFACE
CIRCUIT
ANALOG
INTERFACE
CIRCUIT
CAN DRIVE
CIRCUIT
CAN DRIVE
CIRCUIT
INTERFACE
CIRCUIT
INTERFACE
CIRCUIT
AB
CAN COMMUNICATION CIRCUIT <M/T>
BLA
CK
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