Normal Operation

The ABS module uses information received from several sensors (wheel speed sensors, steering wheel rotation sensor, stability traction/control system sensors) to determine if vehicle stability, traction or roll warrants Electronic Stability Control (ESC) or Roll Stability Control (RSC®) interaction. If an event is going to occur, the ABS module adjusts brake torque at specific wheels and the PCM reduces engine torque to make the vehicle more stable. Once the ABS module has determined that the stability event has been corrected, it returns brake and engine torque to normal and continue to monitor the vehicle. The ABS module does not expect ESC/RSC® interaction to be needed for longer than 15 seconds at a time. If inputs that require ESC/RSC® interaction remain active for longer than 15 seconds, the ABS module disables the ESC and RSC® systems and set DTC C1996.

• DTC C1996 (Active Yaw and/or Roll Control Disabled) - The ABS module monitors the stability event and is programmed to set DTC C1996 and disable the ESC system if the stability event lasts longer than 15 seconds.

This pinpoint test is intended to diagnose the following: 

• Steering wheel rotation sensor
• Stability/traction control sensors
• Wheel speed sensors
• ABS module