Engine Torque Reduction

The electronic brake control module (EBCM) uses a 5-volt pulse width modulated (PWM) signal to request that the powertrain control module (PCM) reduce the amount of torque to the drive wheels. The PCM reduces torque to the drive wheels by retarding spark timing and commanding the throttle actuator control. The PCM uses a 12-volt PWM signal to report to the EBCM the amount of torque that is being delivered to the drive wheels. Engine torque reduction is mostly used to reduce vehicle speed during VSES events and during traction control system (TCS) events when the brakes are in danger of being overheated or when the driven wheels are slipping at the same rate. Engine torque reduction can be disabled by pressing the traction control switch.