[Previous][Next]
Inspection Procedure 9: The stability control/TCL system cannot be disabled when ASC OFF switch is pressed for 3 seconds or more to turn the system OFF.
 
 
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.
 
 
OPERATION
  • ETACS-ECU (ASCS terminal) 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
  • ETACS-ECU malfunction
  • Combination meter malfunction
  • ASC-ECU malfunction
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE) special function
Perform the following special function by the combination meter system, and check if the ABS warning light illuminates (Refer to GROUP 54A - Combination Meter/Special function table ).
  • Item No.9: Indicator (AUTO)
Is the check result normal?
Go to step 2.
Replace the combination meter (Refer to GROUP 54A - Combination Meter ).
 
STEP 2. Using scan tool (M.U.T.-IIISE) data list
Check the ETACS-ECU system data list (Refer to GROUP 54A - ETACS-ECU/Data list reference table ).
  • Item No.104: A.S.C./TCL OFF switch
Is the check result normal?
Go to Step 3.
Refer to GROUP 54A - ETACS, Inspection Procedure 15 "The ASC OFF switch signal is not received." .
 
STEP 3. Retest the system.
Does ASC turn ON and OFF normally using ASC OFF switch?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunction ).
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).