Enhanced UNDERSTEER Control

Enhanced Understeer Control monitors the vehicle for understeer by comparing signals of yaw rate and lateral acceleration, from the Restraints Control Module (RCM), with signals from the steering angle sensor and wheel speed sensors.

When the Anti-lock Brake System (ABS) control module detects the onset of understeer, it signals the Powertrain Control Module (PCM) via the High Speed (HS) Controller Area Network (CAN) chassis bus to request a decrease in engine torque. If required, the ABS control module applies brake pressure to the inside rear wheel to correct the understeer. If the vehicle continues to understeer, Enhanced Understeer Control is activated and uses multiple brakes (maximum of three brakes) to rapidly reduce the vehicle speed.