Final answer:
A freeze frame is generated on an OBD-II vehicle when a diagnostic trouble code (DTC) is detected. It captures the vehicle's parameters at the time the fault occurred and helps technicians diagnose the issue.
Step-by-step explanation:
A freeze frame is generated on an OBD-II vehicle when a diagnostic trouble code (DTC) is detected. OBD-II stands for On-Board Diagnostics II and is a system used in vehicles to monitor and diagnose issues. When a fault is detected by the OBD-II system, a freeze frame is recorded, which captures the vehicle's parameters at the time the fault occurred.
For example, let's say a vehicle's OBD-II system detects a misfire in one of the cylinders. A freeze frame will be generated that includes information such as engine RPM, vehicle speed, coolant temperature, and throttle position at the moment the misfire was detected. This freeze frame helps technicians diagnose the issue by providing valuable information about the vehicle's condition when the fault occurred.