In automotive electronic diagnostics, the term 'continuous' refers to a monitor that is active under which condition?

In automotive electronic diagnostics, the term 'continuous' refers to a monitor that is active under which condition?

• A. When the ignition is off
• B. Only during testing
• C. While the engine is running
• D. When the vehicle is in park

Answer: (C)

Continuous monitors are designed to run in real time whenever the powertrain is operating and the engine is running. They constantly watch sensor data and control activity during normal operation so faults can be detected quickly and the system’s readiness can be updated. This is why the correct condition is while the engine is running. When the ignition is off, the ECU powers down and monitoring stops; it isn’t limited to a special testing mode, and simply being parked doesn’t guarantee engine operation, so meaningful monitoring requires the engine to be running.

Continuous monitors are designed to run in real time whenever the powertrain is operating and the engine is running. They constantly watch sensor data and control activity during normal operation so faults can be detected quickly and the system’s readiness can be updated. This is why the correct condition is while the engine is running. When the ignition is off, the ECU powers down and monitoring stops; it isn’t limited to a special testing mode, and simply being parked doesn’t guarantee engine operation, so meaningful monitoring requires the engine to be running.