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
Damaged wiring harness and connectors
ASC OFF switch malfunction
Malfunction of ETACS-ECU
DIAGNOSIS
1. Check scan tool (M.U.T.-IIISE) CAN bus diagnosis
2. Check scan tool (M.U.T.-IIISE) data list for ETACS-ECU system
ASC OFF switch: During ON operation
Item No.
Item name
Normal condition
104
A.S.C./TCL OFF switch
ON
Item No.
Item name
Normal condition
104
A.S.C./TCL OFF switch
ON
If it is not a normal condition, refer to GROUP 54A - ETACS, Inspection Procedure 15 "The ASC OFF switch signal is not received." .
3. Check does ASC turn ON and OFF normally using ASC OFF switch
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