Introduction to Traction Control/Active Skid Control System Diagnosis

INTRODUCTION TO TCL/ASC DIAGNOSIS
The TCL/ASC is a system that has added the cut valve and suction valve to the conventional ABS system. These valves are used to control each of the road wheels independently. These differences include sounds, sensations, and vehicle performance that owners and service technicians who are not familiar with TCL/ASC may not be used to. Some operational characteristics may seem to be malfunctions, but they are simply signs of normal TCL/ASC operation. When diagnosing the TCL/ASC system, keep these operational characteristics in mind. Inform the owner of the kind of performance characteristics to expect from an TCL/ASC-equipped vehicle.

TCL/ASC DIAGNOSTIC TROUBLE CODE DETECTION CONDITIONS
TCL/ASC diagnostic trouble codes (TCL/ASC DTCs) are set under different conditions, depending on the malfunction detected. Most TCL/ASC DTCs will only be set during vehicle operation. Some TCL/ASC DTCs will also be set during the TCL/ASC self-check immediately after the engine is started.

When you check if an TCL/ASC DTC will be displayed again after the DTC has been erased, you should duplicate the TCL/ASC DTC set conditions. Depending on the detection timing and set conditions for the specific TCL/ASC DTC, you must either drive the vehicle or turn the engine off and restart it. To set the proper conditions for that DTC again, refer to "TCL/ASC DTC SET CONDITIONS" for each TCL/ASC DTC that you are trying to reset.