Mitsubishi Lancer Evolution X. Manual — part 431
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-789
STEP 7. Check for continuity at ETACS-ECU side
connector C-304 and C-315.
(1) Disconnect the connector C-304, C-315 and measure at the
ETACS-ECU side.
(2) Measure the resistance between connector C-304 (terminal
No. 15) and connector C-315 (terminal No. 7).
• Should be less than 2 ohms
Q: Is the harness wire in good condition?
YES : Go to Step 8.
NO : Replace the ETACS-ECU. Then confirm that the
malfunction symptom is eliminated.
STEP 8. Check harness connector B-10 ECM connector for
damage.
Q: Is the connector in good condition?
YES : Repair harness wire between ETACS-ECU connector
C-304 (terminal No. 15) and ECM connector B-10
(terminal No. 105) because of open circuit or short
circuit to ground or harness damage. Then confirm
that the malfunction symptom is eliminated.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 9. Check harness connector A-28X at starter relay
connector for damage.
Q: Is the connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
1
6
4
5
9
8
10 11
13
15
14
12
16
7
2 3
7
3
8
1
4
9
13 14
16
15
10 11 12
17 18 19
2
5 6
AK704319
C-304 ETACS-ECU
side connector
C-315 ETACS-ECU
side connector
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-790
STEP 10. Check the starter relay.
(1) Remove the starter relay.
(2) Check for continuity between the starter relay terminals No.
1 and No. 2.
• There should be continuity.
(3) Use jumper wires to connect starter relay terminal No. 2 to
the positive battery terminal and terminal No. 1 to the
negative battery terminal.
(4) Check for continuity between the starter relay terminals No.
3 and No. 4 while connecting and disconnecting the jumper
wire at the negative battery terminal.
• Should be less than 2 ohms. (Negative battery terminal
connected)
• Should be open loop. (Negative battery terminal discon-
nected)
(5) Install the starter relay.
Q: Is the measured resistance within the specified range?
YES : Go to Step 11.
NO : Replace the starter relay. Then confirm that the
malfunction symptom is eliminated.
STEP 11. Check for continuity at starter relay harness side
connector A-28X.
(1) Disconnect the connector A-28X and measure at the
harness side.
(2) Check for the continuity between terminal No. 1 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 12.
NO : Repair harness wire between starter relay connector
A-28X (terminal No. 1) and ground because of open
circuit or harness damage. Then confirm that the
malfunction symptom is eliminated.
AK604033
1
2
3
4
Starter relay side connector
AC
AK604235
1
2
3
4
AC
Starter relay side connector
AK700518
2
1
3
4
AC
A-28X harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-791
STEP 12. Measure the power supply voltage at starter relay
harness side connector A-28X.
(1) Disconnect the connector A-28X and measure at the
harness side.
(2) Turn the ignition switch to the "START" position.
(3) Measure the voltage between terminal No. 2 and ground.
• Voltage should be battery positive voltage
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 20.
NO : Go to Step 13.
STEP 13. Check harness connector C-51 at clutch interlock
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 the clutch interlock switch.
Refer to GROUP 21A, Clutch Pedal Check and Master Cylin-
der − Inspection − Interlock Switch Operating Check
Q: Are there any abnormalities?
YES : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
NO : Go to Step 15.
STEP 15. Measure the power supply voltage at clutch
interlock switch harness side connector C-51.
(1) Disconnect the connector C-51 and measure at the harness
side.
(2) Turn the ignition switch to the "START" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 18.
NO : Go to Step 16.
AK604216
2
1
3
4
AF
A-28X harness
connector:
component side
AK704591
2 1
AB
C-51 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-792
STEP 16. Check harness connector B-10 at ECM connector
for damage.
Q: Is the connector in good condition?
YES : Go to Step 17.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 17. Check for open circuit and short circuit to
ground between ECM connector B-10 (terminal No. 106)
and clutch interlock switch connector C-51 (terminal No.
1).
Q: Is the harness wire in good condition?
YES : Replace the ECM. When the ECM is replaced,
register the ID code. Refer to GROUP 42B, Diagnosis
− ID Code Registration Judgment Table <Vehicles with
or GROUP 42C, Diagnosis − ID
Codes Registration Judgment Table <Vehicles with
WCM>
. Then confirm that the malfunction
symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
STEP 18. Check for open circuit and short circuit to
ground between clutch interlock switch connector C-51
(terminal No. 2) and starter relay A-28X (terminal No. 2).
Q: Is the harness wire in good condition?
YES : Go to Step 19.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
STEP 19. Check harness connector B-09 at ECM connector
for damage.
Q: Is the connector in good condition?
YES : Check harness connector A-39 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 ECM
connector B-09 (terminal No. 6) and starter relay
connector A-28X (terminal No. 2) because of short
circuit to ground. Then confirm that the malfunction
symptom is eliminated.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
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