Mitsubishi Lancer Evolution X. Manual — part 425
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-765
STEP 10. Check for continuity at ETACS-ECU side
connector C-304 and C-317.
(1) Disconnect the connector C-304, C-317 and measure at the
ETACS-ECU side.
(2) Measure the resistance between connector C-304 (terminal
No. 10) and connector C-317 (terminal No. 6).
NOTE: Connect the (+) side of circuit tester to connector
C-304 (terminal No. 10).
• Should be less than 2 ohms
Q: Is the harness wire in good condition?
YES : Check harness connector C-50 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between
ETACS-ECU connector C-304 (terminal No. 10) and
ECM connector B-10 (terminal No. 92) because of
open circuit or short circuit to ground. Then confirm
that the malfunction symptom is eliminated.
NO : Replace the ETACS-ECU. Then confirm that the
malfunction symptom is eliminated.
STEP 11. Check harness connector C-304, C-317 at
ETACS-ECU connector for damage.
Q: Is the connector in good condition?
YES : Go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
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AK704304
C-317 ETACS-ECU
side connector
C-304 ETACS-ECU
side connector
( )
( )
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-766
STEP 12. Check for continuity at ETACS-ECU side
connector C-304 and C-317.
(1) Disconnect the connector C-304, C-317 and measure at the
ETACS-ECU side.
(2) Measure the resistance between connector C-304 (terminal
No. 10) and connector C-317 (terminal No. 6).
NOTE: Connect the (+) side of circuit tester to connector
C-304 (terminal No. 10).
• Should be less than 2 ohms
Q: Is the harness wire in good condition?
YES : Go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
STEP 13. Check harness connector C-210 ignition switch
connector for damage.
Q: Is the connector in good condition?
YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 14. Check for harness damage between ignition
switch connector C-210 (terminal No. 2) and ETACS-ECU
connector C-317 (terminal No. 6).
Q: Is the harness wire in good condition?
YES : Go to Step 15.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
STEP 15. Check for harness damage between ETACS-ECU
connector C-304 (terminal No. 10) and ECM connector B-10
(terminal No. 92).
Q: Is the harness wire in good condition?
YES : Go to Step 16.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
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5
9
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12
16
7
2 3
AK704304
C-317 ETACS-ECU
side connector
C-304 ETACS-ECU
side connector
( )
( )
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-767
STEP 16. Measure the backup power supply voltage at
ECM harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Measure the voltage between terminal No. 104 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 17.
NO : Repair harness wire between fusible link (36) and
ECM connector B-10 (terminal No. 104) because of
short circuit to ground. Then confirm that the
malfunction symptom is eliminated.
STEP 17. Check for continuity at ECM harness side
connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Check for the continuity between terminals (No. 81, No. 93)
and ground.
• Continuity (2 Ω or less)
Q: Does continuity exist?
YES : Go to Step 18.
NO : Repair harness wire between ECM connector B-10
(terminal No. 81, No. 93) and ground because of open
circuit or harness damage. Then confirm that the
malfunction symptom is eliminated.
AK604223
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
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104
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106
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109 108
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118
AD
B-10 harness
connector: component side
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
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103
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105
106
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109 108
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118
AK704306 AC
B-10 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-768
STEP 18. Measure the power supply voltage at ECM
harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Measure the voltage between terminal No. 73 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 19.
NO : Repair harness wire between MFI relay connector
A-34X (terminal No. 1) and ECM connector B-10
(terminal No. 73) because of open circuit. Then
confirm that the malfunction symptom is eliminated.
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AK604047 AC
B-10 harness
connector:
component side
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