Mitsubishi Evolution X. Manual — part 810
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-247
STEP 10. Check of fuse No. 17 and fusible link No. 34
Visually check for open circuit in the fuse No. 17 and the fusible
link No. 34.
Q: Is the check result normal?
YES : Go to Step 16.
NO : Go to Step 11.
STEP 11. Connector check: C-41 intermediate connector,
C-43 joint connector, C-46 ETACS-ECU connector, C-103
joint connector, C-130 intermediate connector, C-309
ETACS-ECU connector and C-315 ETACS-ECU connector
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the connector. Then, replace fuse No. 17 or
fusible link No. 34.
STEP 12. Wiring harness check between C-309
ETACS-ECU connector and fusible link No. 34.
(1) Remove fusible link No. 34.
(2) Disconnect ETACS-ECU connector C-309, and measure at
the wiring harness side.
(3) Check the continuity (short to ground) between terminal No.
1 and the ground.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 13.
NO : Repair the wiring harness between C-309
ETACS-ECU connector terminal No. 1 and fusible link
No. 34. Then, replace fuse No. 17 or fusible link No.
34.
STEP 13. Wiring harness check between C-315
ETACS-ECU connector and C-103 joint connector.
(1) Disconnect the C-103 joint connector.
(2) Disconnect ETACS-ECU connector C-315, and measure at
the wiring harness side.
(3) Check the continuity (short to ground) between terminal No.
4 and the ground.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 14.
NO : Repair the wiring harness between C-315
ETACS-ECU connector terminal No. 4 and C-103
joint connector terminal No.18. Then, replace fuse
No. 17 or fusible link No. 34.
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-248
STEP 14. Wiring harness check between the C-103 joint
connector and the C-46 S-AWC-ECU connector.
(1) Disconnect the C-46 S-AWC-ECU connector.
(2) Disconnect the C-103 joint connector, and measure at the
wiring harness side.
(3) Check the continuity (short to ground) between terminal No.
16 and the ground.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 15.
NO : Repair the wiring harness between C-103 joint
connector terminal No.16 and C-46 S-AWC-ECU
connector terminal No.12. Then, replace fuse No. 17
or fusible link No. 34.
STEP 15. Wiring harness check between the C-103 joint
connector and the A-05 ASC-ECU connector.
(1) Disconnect ASC-ECU connector A-05.
(2) Disconnect the C-103 joint connector, and measure at the
wiring harness side.
(3) Check the continuity (short to ground) between terminal
No.17 and the ground.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fuse No. 17 or the fusible link No. 34.
Then, go to Step 20.
NO : Repair the wiring harness between C-103 joint
connector terminal No.17 and A-05 ASC-ECU
connector terminal No.2. Then, replace fuse No. 17 or
fusible link No. 34.
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-249
STEP 16. Voltage measurement at A-05 ASC-ECU
connector
(1) Disconnect the connector, connect the ASC check harness
(Special tool: MB991997) to the wiring harness-side
connector, and measure the voltage at the special tool
connector side.
NOTE: Do not connect the special tool to ASC-ECU.
(2) Measure the voltage between the terminal No. 2 and the
body ground.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 20.
NO : Go to Step 17.
STEP 17. 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 and the
body ground.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 18.
NO : Repair the wiring harness between C-309
ETACS-ECU connector terminal No. 1 and the fusible
link No. 34.
STEP 18. Measure the voltage at the C-315 ETACS-ECU
connector.
(1) Without disconnecting the connector, measure by
backprobing.
(2) Measure the voltage between the terminal No. 4 and the
body ground.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 20.
NO : Go to Step 19.
AC400817CN
ASC-ECU
MB991997
A-05 ASC-ECU
harness connector
Check harness
DIAGNOSIS
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ACTIVE SKID CONTROL SYSTEM (ASC)
35C-250
STEP 19. Wiring harness check between A-05 ASC-ECU
connector terminal No. 2 and C-315 ETACS-ECU connector
terminal No. 4
• Check for open circuit.
Q: Is the check result normal?
YES : Go to Step 20.
NO : Repair the wiring harness.
STEP 20. Resistance measurement at A-05 ASC-ECU
connector
(1) Disconnect the connector, connect the ASC check harness
(Special tool: MB991997) to the wiring harness-side
connector, and measure the voltage at the special tool
connector side.
NOTE: Do not connect the special tool to ASC-ECU.
(2) Measure the resistance between the terminal No. 16 and
the body ground as well as between the terminal No. 47
and the body ground.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES : Go to Step 21.
NO : Repair the wiring harness.
STEP 21. Retest the system.
Q: Is the communication with scan tool MB991958
possible?
YES : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
NO : Check that the M.U.T.-III connection cable is properly
connected, and that the V.C.I. switch is turned ON.
Then, replace the hydraulic unit (integrated with
ASC-ECU).(Refer to
.) Then go to Step 22.
STEP 22. Retest the system.
Q: Is the communication with scan tool MB991958
possible?
YES : Return to Step 1.
NO : This diagnosis is complete.
AC400817CO
ASC-ECU
MB991997
A-05 ASC-ECU
harness connector
Check harness
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