W hich of the following is NOT required in order for an engine computer to enter closed loop operation?
A) The oxygen sensor must be up to operating temperature.
B) The engine's coolant temperature must be at or above a specified temperature.
C) The vehicle must be at or above a designated speed as measured by the vehicle speed sensor.
D) A specified time period must have passed since the engine was started.

Question

Quizplus · Accepted Answer

Closed loop operation in an engine computer primarily depends on the oxygen sensor and engine coolant temperature reaching their operational thresholds, and often a certain time elapsed since the engine start. The vehicle's speed does not directly influence the transition to closed loop operation, making option C the correct answer as it is not a requirement for closed loop operation.

W Hich of the Following Is NOT Required in Order