Freeze Frame

Government regulations require that engine operating conditions be captured whenever the Malfunction Indicator Light (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. 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 information. 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. The freeze frame data parameters stored with a DTC failure include the following.

• Air/Fuel Ratio
• Mass Airflow Sensor
• Fuel Trim (Both Short Term And Long Term For Both Cylinder Banks)
• Engine Speed
• Intake Air Temperature
• Engine Coolant Temperature
• Vehicle Speed
• Throttle Position Angle
• Manifold Absolute Pressure/Barometric Pressure
• Fuel System Status