What happens when the ATC detects total wheel slip?

Answer: C — It activates electronic engine control

When the Automatic Traction Control (ATC) detects total wheel slip, it activates electronic engine control. This process is crucial for maintaining stability and traction by adjusting engine power to prevent wheel spin. By managing engine output, the system helps ensure that the vehicle remains controllable, particularly in slippery conditions where traction may be compromised. When wheel slip is detected, the ATC works by reducing engine power or altering ignition timing, which can help regain traction. This functionality is particularly important in vehicles equipped with anti-lock braking systems (ABS) and traction control systems, as it contributes to overall vehicle safety and performance. The other choices, while they represent some features that might be involved in vehicle dynamics, do not specifically align with the function of the ATC in responding to total wheel slip. Engaging the differential, for example, might be relevant to rear-wheel drive or four-wheel drive systems but does not directly pertain to how the ATC manages slip. Similarly, increasing engine power or disengaging manual brakes are not appropriate responses to total wheel slip, as they could potentially exacerbate the loss of traction rather than mitigate it.