Code No. P1231: Trustful Check Active Stability Control (ASC)

FUNCTION

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

TROUBLE JUDGMENT

• Ignition switch is "ON" position.
  

• 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
  

	Go to Step 2.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

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

	Replace the engine-ECU.