Which mode is used for displaying Freeze Frame Data during a diagnostic test?

The correct choice indicates that Mode 2 is used for displaying Freeze Frame Data during a diagnostic test. Freeze Frame Data captures specific conditions of the vehicle's operating parameters at the moment a fault is detected. This data includes information such as engine temperature, vehicle speed, and RPM, which can be crucial for determining the circumstances under which a fault occurred.

Mode 2 allows technicians to access this stored snapshot, enabling them to compare the vehicle's performance against normal operating conditions. This aids in diagnosing issues effectively. By analyzing the Freeze Frame Data, technicians can gain insight into potential problems that may not be present when the vehicle is in normal operation but are significant enough to trigger a diagnostic trouble code (DTC).

While other modes may provide useful data about vehicle performance or allow for the interrogation of DTCs, they do not specifically focus on showcasing the historical snapshot of circumstances leading up to a fault that Freeze Frame Data provides. Understanding the purpose of Mode 2 in retrieving useful insights into diagnostic issues is essential for a smog repair technician in the field.