Download 35C - Road Race Engineering

ACTIVE STABILITY CONTROL SYSTEM (ASC)
DIAGNOSIS
35C-261
OPERATION
• ETACS-ECU terminal No.15 is grounded by pressing ASC
OFF switch. The ON/OFF state of ASC OFF switch is transferred from ETACS-ECU to ASC-ECU via CAN bus line.
• When the ASC OFF switch is pressed for 3 seconds or
more, the ASC system turns OFF.
• When the ASC OFF switch is pressed and held for 15 seconds or more, ASC turns ON.
.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by the open and short circuit in the ASC
OFF switch circuit.
.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• ASC OFF switch malfunction
• Malfunction of ETACS-ECU
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
STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
CAN Bus Diagnostics table P.54C-16.) Then go to
Step 7.
STEP 2. ASC OFF switch check
Refer to P.35C-310.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace ASC OFF switch. (Refer to P.35C-309.)
Then go to Step 7.
STEP 3. Connector check: C-313 ETACS-ECU connector,
C-36 intermediate connector, C-45 ASC OFF switch
connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged connector.
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