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.
Definition Of Terms
2012 Toyota Prius FiveSECTION Definition Of Terms
| Term | Definition |
|---|---|
| Monitor Description | Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). |
| Related DTCs | A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic. |
| Typical Enabling Condition | Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM stores DTCs when monitored value(s) exceeds malfunction threshold(s). |
| Sequence of Operation | Order of monitor priority, applied if multiple sensors and components are involved in a single malfunction detection process. Each sensor and component is monitored in turn, when previous detection operation has completed. |
| Required Sensors/Components | The sensors and components used by the ECM to detect each malfunction. |
| Frequency of Operation | The number of times the ECM checks for each malfunction during each driving cycle. "Once per driving cycle" means ECM only performs checks for that malfunction once during a single driving cycle. "Continuous" means the ECM performs checks for that malfunction whenever enabling conditions are met. |
| Duration | Minimum time for which the ECM must detect a continuous deviation in monitored value(s) in order to set a DTC. Timing begins when Typical Enabling Conditions met. |
| Typical Malfunction Thresholds | The value beyond which the ECM determines malfunctions exist and stores DTCs. |
| MIL Operation | Timing of MIL illumination after a malfunction is detected. "Immediate" means the ECM illuminates the MIL as soon as a malfunction is detected. "2 driving cycles" means the ECM illuminates the MIL if the same malfunction is detected a second time during the next sequential driving cycle. |
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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.