[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.
 
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness and connectors
  • ASC OFF switch malfunction
  • Malfunction of ETACS-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-III) CAN bus diagnostics
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
 
STEP 2. Scan tool (M.U.T.-III) data list for other system
Check the ETACS-ECU system data list.
  • ASC OFF switch: During ON operation
 
Item No. Item nameNormal condition
281ASC/TCL OFF switchON
Item No. Item nameNormal condition
281ASC/TCL OFF switchON
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 ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ). Then go to Step 4.
 
STEP 4. Retest the system.
Does ASC turn ON and OFF normally using ASC OFF switch?
This diagnosis is complete.
Return to Step 1.