Freeze Frame/Failure Records

PCM stores one freeze frame record (failure record "0") for the first failed test that sets a DTC and illuminates MIL. Freeze frame will not be overwritten unless a misfire or fuel trim DTC is set. Failure records are stored when any DTC is set. Six additional failure records can be stored in PCM. Failure records will be stored for all types of codes, whether or not the MIL is illuminated. If greater than 6 DTCs are set, oldest failure record is deleted as newest failure record is stored. Typical failure record data includes:

• Air/fuel ratio.
• Airflow rate.
• Fuel trim.
• Engine speed.
• Engine load.
• Engine coolant temperature.
• Vehicle speed.
• Throttle position angle.
• Manifold absolute pressure.
• Injector base pulse width.
• Loop status.