Download 35C - Road Race Engineering

35C-268
ACTIVE STABILITY CONTROL SYSTEM (ASC)
DIAGNOSIS
• ASC-ECU contains the power supply circuit (terminal No.8)
for ASC-ECU. When the ignition switch (IG1) is turned ON,
the voltage is applied to the relay incorporated in
ETACS-ECU to turn ON the relay, and the power is supplied
from the fusible link No.34 through multi-purpose fuse
No.12.
• ASC-ECU contains the power supply circuit (terminal No.1)
for the pump motor. The pump motor is energised by the
motor switch, which is incorporated in ASC-ECU.
• When malfunction occurs in ASC-ECU power supply, the
communication with scan tool becomes unavailable.
.
PROBABLE CAUSES
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Damaged wiring harness and connectors
Fuse and fusible link malfunction
Improper tightening of battery terminal
Improper tightening of ground bolt
Battery failure
Charging system failed
ASC-ECU malfunction
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
• MB991997: ASC check harness
STEP 1. Battery check
Refer to GROUP 54A −Battery Test P.54A-8.
Q: Is the battery in good condition?
YES : Go to Step 3.
NO : Charge or replace the battery. Then go to Step 2.
STEP 2. Charging system check
Refer to GROUP 16 −Charging System P.16-4.
Q: Is the charging system in good condition?
YES : Go to Step 3.
NO : Repair or replace the charging system component(s).
STEP 3. Connector check: A-51 ASC-ECU connector,
C-128 intermediate connector, C-317 ETACS-ECU
connector, C-315 ETACS-ECU connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged connector.
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