Freeze Frame/Failure Records

With all emission related faults and when the PCM/TCM commands MIL (SERVICE ENGINE SOON) On, the PCM/TCM stores vehicle information into a memory called FREEZE FRAME. The freeze frame is a regulated requirement which allows for certain information to be stored. This information is data for a DTC that caused the MIL to illuminate for the first time. The Scan tool displays this information in the DTC MENU under the FREEZE FRAME/FAILURE RECORDS directory as failure record "0." Failure records the same data plus additional information and stores it in failure records numbered one through six. The failure record data records the same information as the emission freeze frame plus vital information specific to that failure. When the total recorded failures exceeds six, the oldest failure will be removed and the most recent installed as #1.
FREEZE FRAME 0 will store the following:
- DTC #
- Commanded A/F ratio
- Calculated air flow
- Calculated engine load
- ECT
- Barometric pressure
- Injector pulse width
- Short term FT
- Long term FT
- MAP
- RPM
- Loop status
- TP angle
- Vehicle speed
- Odometer reading at FIRST failure (odometer is reset to 0 when DTCs are cleared)
- Odometer reading at LAST failure (indicates the odometer miles the last time the DTC test failed).
If equipped with automatic transaxle the following will also be stored:
- TR switch-P/A/B/C
- TFP switch A/B/C
- TFP range
- 1-2 shift solenoid (On/Off)
- 2-3 shift solenoid (On/Off)
- Trans Fluid Temp
- TCC (On/Off)
- Transmission ISS
- Gear ratio
For most of the DTCs the freeze frame/failure record will also store:
- 02S voltage
- H02S voltage
- Ignition volts
Some DTCs will replace these parameters with specific data related to the DTC stored. Those parameters will aid in specific DTC diagnosis.
The freeze frame/failure records for PCM will record all of this information plus specific data related to the DTC. History record data will be erased from PCM memory during a DTC clear or after 40 warm-up cycles without any faults detected.