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

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 outputted from the ASC-ECU.

Q. Is diagnosis code set?

Perform troubleshooting of the active stability control (Refer to GROUP 35C - Troubleshooting - Diagnosis Code Chart ).
Replace the engine-ECU.