Electronic Traction Control

WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.

Electronic Traction Control (ETC) attempts to optimize forward traction by reducing engine torque or braking a spinning wheel until traction is restored.

ETC is activated if an individual wheel speed is above that of the vehicle reference speed (positive slip) and the brake pedal is not pressed. The spinning wheel is braked, allowing the excess torque to be transmitted to the non spinning wheels through the drive line. If necessary, the Anti-lock Brake System (ABS) control module also transmits a message to the Powertrain Control Module (PCM) requesting a reduction in engine torque.

Torque reduction requests are for either a slow or fast response. A slow response requests a reduction of throttle angle; a fast response requests an ignition cut-off.

When the Dynamic Stability Control (DSC) function is selected off with the DSC switch, the engine torque reduction feature is disabled.

When the ETC function is active the ABS control module also signals the Transmission Control Module (TCM) to prevent gear shifts.