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
PCM records engine operating condition when an emission related fault is detected. This single "snapshot" is stored in PCM memory to aid in diagnostics by indicating conditions present when DTC is detected. Freeze-frame data is kept in order of priority. If low priority freeze-frame data (priority 1) is stored and another freeze-frame fault should occur, with the same priority, only the original freeze-frame data will remain. Always record this information when reviewing information.
If MIL should illuminate, indicating a 2nd trip malfunction or a higher priority code, the lower priority freeze-frame data would be replaced with the priority 2 or 3 freeze-frame data. Should a priority 3 malfunction occur (misfire, A/T or air/fuel system fault), then any other lower priority freeze-frame data would be replaced with priority 3 freeze-frame data. See FREEZE FRAME PRIORITY IDENTIFICATION table. This recorded data is useful for determining conditions in which the malfunction occurs.
| Priority | Items | ||
|---|---|---|---|
| 1 | Freeze Frame Data For Misfire DTC P0300-P0308; Fuel Injection System DTC P0171, P0172 | ||
| 2 | (1) 2nd Trip Freeze Frame Data | ||
| 3 | 1st Trip Freeze Frame Data | ||
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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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