Mitsubishi Lancer (4A9 engine). Manual — part 77
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-161
STEP 3. Connector check: A-58 ASC-ECU
connector, C-128 intermediate connector, C-212
ignition switch connector, C-309 ETACS-ECU
connector, C-315 ETACS-ECU connector, C-317
ETACS-ECU connector
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Repair the damaged connector.
STEP 4. Fusible link check: Check the fusible link
No.27.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Resistance measurement at A-58 ASC-
ECU connector
(1) Removal the fusible link No.27.
AC606869 HE
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(2) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the resistance at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(3) Measure the resistance between the terminal
No.32 and the body earth.
OK: No continuity
Q: Is the check result normal?
YES :
Replace the fusible link No.27. Then go to
Step 24.
NO :
The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.32 and the fusible
link No.27, and then replace the fusible link
No.27. Then go to Step 24.
STEP 6. Voltage measurement at the A-58 ASC-
ECU connector
AC606869DG
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(1) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the voltage at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(2) Measure the voltage between terminal No.32 and
body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.32 and the fusible
link No.27. Then go to Step 24.
STEP 7. Check the fusible link No.26.
Q: Is the check result normal?
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-162
YES :
Go to Step 9.
NO :
Go to Step 8.
STEP 8. Resistance measurement at A-58 ASC-
ECU connector
(1) Removal the fusible link No.26.
AC606869LC
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(2) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the resistance at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(3) Measure the resistance between the terminal
No.1 and the body earth.
OK: No continuity
Q: Is the check result normal?
YES :
Replace the fusible link No.26. Then go to
Step 24.
NO :
The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.1 and the fusible link
No.26, and then replace the fusible link
No.26. Then go to Step 24.
STEP 9. Voltage measurement at the A-58 ASC-
ECU connector
AC606869LD
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(1) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the voltage at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(2) Measure the voltage between terminal No.1 and
body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.1 and the fusible link
No.26. Then go to Step 24.
STEP 10. Check the fuse No.12.
Visually check for open circuit in fuse No.12.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 11.
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-163
STEP 11. Resistance measurement at A-58 ASC-
ECU connector
(1) Disconnect the C-317 ETACS-ECU connector.
AC606869HF
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(2) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the resistance at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(3) Measure the resistance between the terminal
No.8 and the body earth.
OK: No continuity
Q: Is the check result normal?
YES :
Replace the fuse No.12. Then go to Step
24.
NO :
The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.8 and the C-317
ETACS-ECU connector terminal No.5, and
then replace the fuse No.12. Then go to
Step 24.
STEP 12. Check the fuse No.17.
Visually check for open circuit in fuse No.17.
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Go to Step 13.
STEP 13. Resistance measurement at A-58 ASC-
ECU connector
(1) Disconnect the C-315 ETACS-ECU connector.
AC606869 HH
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
(2) Disconnect the ASC-ECU connector, connect
special tool ASC check harness (MB991997) to
the harness-side connector, and then measure
the resistance at the special tool connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(3) Measure the resistance between the terminal
No.2 and the body earth.
OK: No continuity
Q: Is the check result normal?
YES :
Replace the fuse No.17. Then go to Step
24.
NO :
The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.2 and the C-315
ETACS-ECU connector terminal No.4, and
then replace the fuse No.17. Then go to
Step 24.
STEP 14. Measure the voltage at the C-309
ETACS-ECU connector.
(1) Disconnect the connector, and measure at the
wiring harness-side connector.
(2) Measure the voltage between the terminal No.1
TROUBLESHOOTING
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-164
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 15.
STEP 15. Fusible link check: Check the fusible
link No.34 <PETROL> or No.44 <DIESEL>.
Q: Is the check result normal?
YES :
Go to Step 17.
NO :
Go to Step 16.
STEP 16. Resistance measurement at C-309
ETACS-ECU connector
(1) Removal the fusible link No.34 <PETROL> or
No.44 <DIESEL>.
(2) Disconnect the C-309 ETACS-ECU connector,
and then measure the resistance at the
connector side.
(3) Measure the resistance between the terminal
No.1 and the body earth.
OK: No continuity
Q: Is the check result normal?
YES :
Replace the fusible link No.34 <PETROL>
or No.44 <DIESEL>. Then go to Step 24.
NO :
The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the C-309 ETACS-ECU
connector terminal No.1 and the fusible link
No.34 <PETROL> or No.44 <DIESEL>, and
then replace the fusible link No.34
<PETROL> or No.44 <DIESEL>. Then go to
Step 24.
STEP 17. Resistance measurement at fusible link
No.34 <PETROL> or No.44 <DIESEL> and C-309
ETACS-ECU connector
(1) Disconnect the C-309 ETACS-ECU connector
and fusible link No.34 <PETROL> or No.44
<DIESEL>, and then measure the resistance at
the harness connector side.
(2) Measure the resistance between the fusible link
No.34 <PETROL> or No.44 <DIESEL> and C-
309 ETACS-ECU connector terminal No.1.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the fusible link No.34
<PETROL> or No.44 <DIESEL> and C-309
ETACS-ECU connector terminal No.1. Then
go to Step 24.
STEP 18. Resistance measurement at A-58 ASC-
ECU connector
(1) Disconnect the C-317 ETACS-ECU connector.
AC606869 HG
ASC-ECU
MB991997
Check harness
A-58 ASC-ECU
harness connector
Connector: C-317
(harness side)
(2) Disconnect the A-58 ASC-ECU connector,
connect special tool ASC check harness
(MB991997) to the harness-side connector, and
then measure the resistance at the special tool
connector side.
NOTE: Do not connect the special tool ASC
check harness (MB991997) to ASC-ECU.
(3) Measure the resistance between the A-58 ASC-
ECU connector terminal No.8 and the C-317
ETACS-ECU connector terminal No.5.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the A-58 ASC-ECU
connector terminal No.8 and the C-317
ETACS-ECU connector terminal No.5. Then
go to Step 24.
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