What does the driver need to do if the automatic coupler fault is detected in the lead motor?

When an automatic coupler fault is detected in the lead motor, it's essential to understand the implications of this situation. If the coupler has not established a connection—meaning the train is not coupled as intended—then there is no immediate operational concern regarding the coupling.

Choosing the option that states no action is required reflects an understanding that the fault does not affect the train's movement or safety, as it has not attempted to couple. In this scenario, the driver can safely proceed with operations without interference from a coupling mechanism that is not engaged.

This option emphasizes the importance of assessing the operational status of the train before taking any further action. It highlights the principle of responding to actual faults rather than perceived issues that do not currently impact the safety and functionality of the train system. In contrast, the other options imply an unnecessary level of concern or action when the fault does not necessitate it.