Code No. P1231: Trustful Check Active Stability Control (ASC) <Vehicles with ASC>


FUNCTION



  • Checks for an abnormal signal of active stability control (ASC) via the CAN communication.

TROUBLE JUDGMENT


Check Condition
  • Ignition switch is "ON" position.
Judgment Criterion
  • A torque demand signal from the active stability control (ASC) is abnormal.

FAIL-SAFE AND BACKUP FUNCTION



  • Torque requested by active stability control (ASC) is ignored.

PROBABLE CAUSES



  • Failed active stability control system
  • Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

  • Reconfirmation of diagnosis code.

Q. Is diagnosis code set?
Go to Step 2 .
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

STEP 2. M.U.T.-III diagnosis code

  • Confirm the diagnosis code is set from the ASC-ECU.

Q. Is diagnosis code set?
Perform troubleshooting of the active stability control system (ASC) (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).
Replace the engine-ECU.