Which of the following scenarios would initiate open loop condition?

Open loop conditions occur in engine management systems when the engine control unit (ECU) operates without relying on feedback from oxygen sensors among other sensors. This typically happens during certain driving conditions when the ECU needs to make immediate adjustments based on predefined parameters rather than real-time data.

During wide open throttle acceleration, the engine is demanding maximum power, and the ECU often uses a predetermined fuel map for optimal performance. It prioritizes performance over emissions control, leading to an open loop condition. This allows the engine to provide the required power without adjusting for factors like air-fuel ratios based on exhaust gas composition.

In contrast, idling or stable highway speeds generally allow for continuous feedback from sensors, keeping the system in closed loop conditions where adjustments are made based on real-time sensor data. Similarly, the engine cooling down would not trigger open loop because the ECU would still be working with available sensor inputs.