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
ECM/PCM records operating conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed and absolute pressure. Freeze-frame data is a "snapshot" of these operating conditions present when a fault is detected. When a fault is detected for the first time, ECM/PCM stores the first trip DTC, along with first trip freeze-frame data. Only one set of freeze-frame data can be stored in ECM/PCM (either first trip freeze-frame data or freeze-frame data). There is no priority for first trip freeze frame data. It is updated each time a different first trip DTC is stored. If a fault is detected for the second time, first trip freeze-frame data is replaced with freeze-frame data.
Freeze-frame data is updated in order of priority. See FREEZE FRAME PRIORITY IDENTIFICATION table. If a priority 1 fault (misfire or fuel injection system malfunction) is detected in another trip when priority 2 freeze-frame data is already stored in ECM/PCM, priority 2 freeze-frame data will be replaced by priority 1 freeze-frame data.
| Priority | Items | ||
|---|---|---|---|
| 1 | Freeze Frame Data For Misfire DTC P0300-P0306, Fuel Injection System DTC P0171, P0172, P0174, P0175 | ||
| 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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