Mitsubishi Lancer Evolution X. Manual — part 410
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-705
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AK900378
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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
A-14
A-13
C-104
C-131
103
5
16
14
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16
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91
J/C (CAN4)
A-14
J/C (CAN2)
C-104
4
15
6
19
9
C-301
8
21
C-131
20
C-131
ENGINE CONTROL MODULE
J/C
(CAN 3)
C-127
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
GREEN
GREEN
PINK
GREEN-WHITE
GREEN-
WHITE
PINK
YELLO
W
YELLO
W
YELLO
W
-
GREEN
YELLO
W
-
GREEN
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 <TC-SST>
BLA
CK
A-13
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-706
.
CIRCUIT OPERATION
• Battery voltage is applied to the diagnosis con-
nector (terminal No. 16).
• The diagnosis connector (terminal No. 4 and No.
5) is grounded to the vehicle body.
.
COMMENT
• When the communication between M.U.T.-III and
ECM is impossible, it can be suspected that the
CAN bus line, power supply circuit of the diagno-
sis connector, and/or grounding circuit are defec-
tive.
• Communication can not be achieved either, if a
wrong vehicle type is selected on M.U.T.-III.
.
AK704342 AB
Connectors: A-13, A-14
A-14
A-13
AK704235 AB
Connector: B-10
ECM
B-10 (GR)
AK704343AB
Hood lock release
handle
Connector: C-40
C-40 (B)
Data link connector
AK704344 AB
Connector: C-104
C-104
AK704345AB
Connector: C-127
C-127
AK704346
AB
Connector: C-131
C-131
AK704347AB
Connectors: C-301, C-309 and C-317
ETACS-ECU
C-301
C-309 (B)
C-317
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-707
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the data link connector.
• Open/short circuit or poor contact in the data link
connector.
• Malfunction of the CAN communication.
• Malfunction of the scan tool.
• Malfunction of the ECM.
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. Check the vehicle communication interface (V.C.I.)
MB991824 operations.
(1) Connect the Scan tool to the data link connector.
(2) When the power of V.C.I. is turned to ON, the indicator lamp
of the V.C.I. illuminates in green.
• The indicator lamp of the V.C.I. illuminates in green.
Q: Is the indicator lamp of the V.C.I. illuminates in green?
YES : Go to Step 2.
NO : Use scan tool, perform CAN bus line diagnosis.
STEP 2. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.
• The voltage should be 8 volts or more.
Q: Is the measured voltage 8 volts or more?
YES : Go to Step 3.
NO : Check the battery. Refer to GROUP 54A, Battery −
On-vehicle Service − Battery Test
. Then
confirm that the malfunction symptom is eliminated.
STEP 3. Check harness connector C-40 at data link
connector for damage.
Q: Is the harness 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.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-708
STEP 4. Measure the power supply voltage at data link
connector C-40.
(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 5.
NO : Repair an open circuit between ETACS-ECU
connector C-317 (terminal No. 8) and data link
connector C-40 (terminal No. 16). Then confirm that
the malfunction symptom is eliminated.
STEP 5. Check the continuity at data link connector C-40.
(1) Check for the continuity between terminal No. 4, No. 5 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Check and 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-40 (terminal No. 4, No. 5) and
ground. Then confirm that the malfunction symptom is
eliminated.
Inspection procedure 2: The malfunction indicator lamp (SERVICE ENGINE SOON or check engine
lamp) does not illuminate right after the ignition switch is turned to the "ON" position
.
CIRCUIT OPERATION
• The combination meter causes the malfunction
indicator lamp (SERVICE ENGINE SOON or
Check Engine Lamp) to illuminate immediately
after the ignition switch is turned to the "ON" posi-
tion occurred.
.
TROUBLESHOOTING HINTS (The most
likely causes for this case:)
• Malfunction of the malfunction indicator lamp
(SERVICE ENGINE SOON or Check Engine
Lamp).
• Open or shorted malfunction indicator lamp
(SERVICE ENGINE SOON or Check Engine
Lamp) circuit.
AK604031
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
AC
C-40 harness
connector:
component side
AK604032
1 2 3 4 5 6 7 8
16
15
14
13
12
11
10
9
AC
C-40 harness
connector:
component side
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