Inspection Procedure 9: The stability control/traction control function 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 diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnosis Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION

  • ETACS-ECU terminal No. 15 is earthed 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 circuit in the ASC OFF switch circuit.

PROBABLE CAUSES

  • Damaged wiring harness and connectors
  • ASC OFF switch malfunction
  • Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. ASC OFF switch check
Refer to .

Q. Is the check result normal?
Go to Step 2.
Replace ASC OFF switch. (Refer to .) Then go to Step 6.

STEP 2. Connector check: C-313 ETACS-ECU connector, C-36 intermediate connector, C-102 ASC OFF switch connector

Q. Is the check result normal?
Go to Step 3.
Repair the damaged connector.

STEP 3. Wiring harness check between C-313 ETACS-ECU connector terminal No. 15 and C-102 ASC OFF switch connector terminal No. 1

  • Check the power supply circuit for open circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness between C-313 ETACS-ECU connector terminal No. 15 and C-102 ASC OFF switch connector terminal No. 1.

STEP 4. Wiring harness check between C-102 ASC OFF switch connector terminal No. 2 and the body earth

  • Check the earth wires for open circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness between C-102 ASC OFF switch connector terminal No. 2 and the body earth.

STEP 5. Retest the system.

Q. Does ASC turn ON and OFF normally using ASC OFF switch?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)
Replace the ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU .) Then go to Step 6.

STEP 6. Retest the system.

Q. Does ASC turn ON and OFF normally using ASC OFF switch?
This diagnosis is complete.
Return to Step 1.