Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Freeze Frame Data Table
| Acronym | Description | Measurement Units |
|---|---|---|
| APP_D | Accelerator Pedal Position D | % |
| APP_E | Accelerator Pedal Position E | % |
| BARO | Barometric Pressure | kPa |
| CATTEMP11 | Catalyst Temperature Bank 1, Sensor 1 | Degrees |
| CATTEMP21 | Catalyst Temperature Bank 2, Sensor 1 | Degrees |
| CLRDIST | Distance Since Codes Cleared | Km/mi |
| ECT | Engine Coolant Temperature | Degrees |
| EQ_RAT | Commanded Equivalence Ratio | Unit |
| EQ_RAT11 | Lambda Value Bank 1, Sensor 1 | Unit |
| EQ_RAT21 | Lambda Value Bank 2, Sensor 1 | Unit |
| EVAPPCT | Commanded Evaporative Purge | % |
| FLI | Fuel Level Input | % |
| FRP | Fuel Rail Pressure | kPa |
| FUELSYS1 | Open/Closed Loop 1 | OL/CL/OL DRIVE/OL FAULT/CL FAULT |
| FUELSYS2 | Open/Closed Loop 2 | OL/CL/OL DRIVE/OL FAULT/CL FAULT |
| IAT | Intake Air Temperature | Degrees |
| LFT1 | Long Term Fuel Bank 1 | % |
| LFT2 | Long Term Fuel Bank 2 | % |
| LOAD | Calculated Load Value | % |
| MAF | Mass Airflow Rate | g/s |
| MAP | Manifold Absolute Pressure | Volts/kPa/PSI/in-Hg |
| O2S11 | Bank 1 Upstream Oxygen Sensor (11) | Volts/mA |
| O2S12 | Bank 1 Downstream Oxygen Sensor (12) | Volts |
| O2S21 | Bank 2 Upstream Oxygen Sensor (21) | Volts/mA |
| O2S22 | Bank 2 Downstream Oxygen Sensor (22) | Volts |
| RPM | Engine RPM | RPM |
| RUNTM | Run Time | Seconds |
| SFT1 | Short Term Fuel Bank 1 | % |
| SFT2 | Short Term Fuel Bank 2 | % |
| SPARKADV | Spark Advance | Degrees |
| TAC_PCT | Commanded Throttle Actuator | % |
| TP | Absolute Throttle Position | % |
| TP_REL | Relative Throttle Position | % |
| VS | Vehicle Speed | km/h-mph |
| WARMUPS | Number Of Warmups Since Code Cleared | Units |
Some unique PIDs are stored in the keep alive memory (KAM) 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 stored for every MIL code and are used for misfire diagnosis only. The MFF data could be more useful for misfire diagnosis than the generic freeze frame data. It is captured at the time of the highest misfire rate, not when the DTC is stored at the end of a 200 or 1, 000 revolution block (generic freeze frame data for misfire can be stored minutes after the misfire actually occurred).
The 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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