Traction Control System (TRAC) and Electronic Stability Control (ESC) Traction Control System (TRAc) The purpose of the traction control system (tcs, or TRAC) (Fig. 10-3)is to prevent wheel spin from occurring due to acceleration the maximum torque that can be transmitted to the wheels is determined by the coefficient of friction generated between the road and the tires. If torque exceeds that level, the wheels are likely to spin. Conditions for TRAC operation may include: loose gravel, slippery road surfaces, acceleration while cornering and hard acceleration [1] Once activated the trac system reduces engine torque and rear wheel speed as necessary to bring the vehicle under control. The abs ecu, tRac ecu and ecm all work together to provide traction control aBs speed sensors are monitored by the tRaC eCU which in turn controls a sub-throttle plate and applies the rear brakes. the ECM also retards engine timing while the abs modulates pressure at the rear brakesTraction Control System (TRAC) and Electronic Stability Control (ESC) Traction Control System (TRAC) The purpose of the traction control system (TCS, or TRAC) (Fig.10-3) is to prevent wheel spin from occurring due to acceleration. The maximum torque that can be transmitted to the wheels is determined by the coefficient of friction generated between the road and the tires. If torque exceeds that level, the wheels are likely to spin. Conditions for TRAC operation may include: loose gravel, slippery road surfaces, acceleration while cornering and hard acceleration [1]. Once activated, the TRAC System reduces engine torque and rear wheel speed as necessary to bring the vehicle under control. The ABS ECU, TRAC ECU and ECM all work together to provide traction control. ABS speed sensors are monitored by the TRAC ECU which in turn controls a sub-throttle plate and applies the rear brakes. The ECM also retards engine timing while the ABS modulates pressure at the rear brakes