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.
1ST Trip Detection Logic And Two Trip Detection Logic
When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in the ECM memory. The MIL will not illuminate at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored in the ECM memory, and the MIL illuminates. The MIL illuminates at the same time when the DTC is stored. <2nd trip> The "trip" in the "Two Trip Detection Logic" means a driving mode in which self-diagnosis is performed during vehicle operation. Specific on board diagnostic items will cause the ECM to illuminate or blink the MIL, and store DTC and Freeze Frame data, even in the 1st trip, as shown below.
*: Applicable -: Not applicable
| Items | MIL | DTC | 1st Trip DTC | |||||
|---|---|---|---|---|---|---|---|---|
| 1st Trip | 2nd Trip | 1st Trip Displaying | 2nd Trip Displaying | 1st Trip Displaying | 2nd Trip Displaying | |||
| Blinking | Illuminated | Blinking | Illuminated | |||||
| Misfire (Possible three way catalyst damage) - DTC: P0300 - P0304 is being detected | * | - | - | - | - | - | * | - |
| Misfire (Possible three way catalyst damage) - DTC: P0300 - P0304 is being detected | - | - | * | - | - | * | - | - |
| One trip detection diagnoses (Refer to DTC INDEX .) | - | * | - | - | * | - | - | - |
| Except above | - | - | - | * | - | * | * | - |
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.