Freeze Frame Data

Description

Government regulations require that engine operating conditions be captured whenever the MIL is illuminated. The data captured is called Freeze Frame data. The Freeze Frame data is very similar to a single record of operating conditions.


Operation

Whenever the MIL is illuminated, the corresponding record of operating conditions is recorded as Freeze Frame data. A subsequent failure will not update the recorded operating conditions.

The Freeze Frame data parameters stored with a DTC failure include the following:

^ Air Fuel Ratio

^ Air Flow Rate

^ Fuel Trim

^ Engine Speed

^ Engine Load

^ Engine Coolant Temperature

^ Vehicle Speed

^ TP Angle

^ MAP/BARO

^ Injector Base Pulse Width

^ Loop Status

Freeze frame data can only be overwritten with data associated with a misfire or fuel trim malfunction. Data from these faults take precedence over data associated with any other fault. The Freeze Frame data will not be erased unless the associated history DTC is cleared.