Freeze Frame Data Table
FREEZE FRAME DATA
| Acronym | Description | Measurement Units |
|---|---|---|
| ECT | Engine Coolant | DEGREES |
| FUELSYS1 | Open/Closed Loop1 | OL/CL/OL DRIVE/OL FAULT/CL FAULT |
| FUELSYS2 | Open/Closed Loop2 | OL/CL/OL DRIVE/OL FAULT/CL FAULT |
| LONGFT1 | Long Term Fuel Bank1 | PERCENT |
| LONGFT2 | Long Term Fuel Bank2 | PERCENT |
| LOAD | Calculated Load Value | PERCENT |
| RPM | Engine RPM | R/MIN |
| SHRTFT1 | Short Term Fuel Bank1 | PERCENT |
| SHRTFT2 | Short Term Fuel Bank2 | PERCENT |
| VSS | Vehicle Speed | MPH-KMH |
Some unique parameters (PIDs) are stored in the Keep Alive Memory of the PCM to help in diagnosing the root cause of misfires. These PIDs are collectively called misfire freeze-frame (MFF) data. These parameters are separate from the generic freeze-frame data that is stored for every MIL code. They are used for misfire diagnosis only. The MFF data is more useful for misfire diagnosis than the normal diagnosis only. It is captured at the time of the highest misfire rate and not when the DTC is stored at the end of a 1000 or 200 revolution block. (Generic freeze-frame data for misfire can be stored minutes after the misfire actually occurred).
NOTE:
- MFF PIDs are supported on all vehicles but may not be available on all scan tools because enhanced PID access may vary by scan tool manufacturer.