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Inspection Procedure 11: ASC does not operate or faulty ASC operate.
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
 
 
COMMENTS ON TROUBLE SYMPTOM
In case of this trouble symptom, the stability control/TCL system operation may be disabled. DTC may be set by the stability control/TCL system using scan tool (M.U.T.-IIISE).
 
 
 
PROBABLE CAUSES
  • Low battery output
  • Wiring harness or connector failure of CAN bus line
  • ASC-ECU malfunction
  • Engine coding data problem
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check other DTC.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Use scan tool (M.U.T.-IIISE) to check the DTC for the ASC system. (Refer to .)
Is the check result normal?
Go to Step 2.
Carry out the diagnosis for the DTC (Refer to ).
 
STEP 2. ECM coding data check.
A.S.C.
  • OK: Available
Is the check result normal?
Go to Step 4.
Go to Step 3.
 
STEP 3. ECM coding data check.
Perform the variant coding to the ECM.
Is the check result normal?
Go to Step 5.
Replace the ECM (Refer to GROUP 13A - ECM ). Then go to Step 5.
 
STEP 4. Hydraulic unit (integrated with ASC-ECU) check.
Check that the brake tube is correctly mounted to the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Is the check result normal?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 5.
Connect the brake tubes correctly, and repair or replace the external brake lines of the hydraulic unit (integrated with ASC-ECU).
 
STEP 5. Operation check.
Does stability control/TCL operate normally?
This diagnosis is complete.
Check the brake system related components other than the stability control/TCL system.