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: Description
Freeze frame data allows access to emission related values from specific generic parameter identification (PIDs). These values are stored the instant an emission related diagnostic trouble code (DTC) is stored in continuous memory. This provides a snapshot of the conditions that were present when the DTC was stored. Once one set of freeze frame data is stored, this data remains in memory even if another emission related DTC is stored. When a DTC associated with the freeze frame is erased or a keep alive memory (KAM) reset is carried out, new freeze frame data can be stored. In the event of multiple emission related DTCs in memory, always note the DTC for the freeze frame data.
| Acronym | Description | Measurement Units |
|---|---|---|
| DTCFZ | DTC Which Stored Freeze Frame | # |
| LOAD | Calculated Load Value | Percent |
| ECT | Engine Coolant Temperature | Celsius/Degrees F |
| MAP | Manifold Absolute Pressure | kPa |
| RPM | Engine RPM | RPM |
| VSS | Vehicle Speed | MPH |
| IAT | Intake Air Temperature | Degrees F |
| MAF | Air Flow Rate | DCV |
| PTO | Power Take Off Status | DCV |
| RUNTM | Time Since Engine Start | Seconds |
| EGR_PCT | Commanded EGR | Percent |
| EGR_ERR | EGR Error | Percent |
| FLI | Fuel Level Input | Percent |
| WARM_UPS | # Of Warm-ups Since Codes Cleared | # |
| CLRDIST | Distance Since Codes Cleared | Miles |
| BARO | Barometric Pressure | kPa (psi) |
| VPWR | Control Module Voltage | Volts |
| APP_MODE | Accelerator Pedal Position | CT, PT, WOT |
NO RELATED
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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.