What happens if the maximum number of attempts for dry motoring is reached?

When the maximum number of attempts for dry motoring is reached, it is necessary to allow for a cool-down period before making any further attempts. This cool-down period is crucial as it helps to prevent excessive heat buildup in the engine components, reducing the risk of damage. During dry motoring, the engine is turned over without fuel being introduced, generating heat from the engine's moving parts. If the attempts continue without a break, it could lead to overheating and potential mechanical failures.

The other options suggest actions that do not align with standard procedures after reaching the maximum attempts. Shutting down the engine permanently would be an extreme measure, and a complete reset of the sequence may not be necessary unless specified by the protocols. Continuing the process without breaks would disregard the importance of managing engine temperature and component integrity. Therefore, implementing a cool-down period is the recommended and safest action to take in this scenario.