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.
Diagnostic Method
After the enable conditions have been established, calculate the front oxygen (A/F) sensor lambda value deviation sum value (Σ |(sglmdn - sglmdn-1 )|), and rear oxygen sensor output voltage deviation sum value (Σ |(ro2sadn - ro2sadn-1 )|) in every 32 ms x 4 times. If the front oxygen (A/F) sensor lambda value deviation sum value (Σ |(sglmdn - sglmdn-1 )|) is the predetermined value or more, calculate the diagnostic value.
- Abnormality Judgment
If the duration of time while the following conditions are met is within the time indicated, judge as NG.
| Malfunction Criteria | Threshold Value |
|---|---|
| Σ |(ro2sadn - ro2sadn-1 )|/Σ |(sglmdn - sglmdn-1 )| | > 10 (except for PZEV model) > 8 (PZEV model) |
Time Needed for Diagnosis: 30 - 55 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
Judge as OK and clear the NG if the continuous time while the following conditions are established is within the predetermined time.
| Malfunction Criteria | Threshold Value |
|---|---|
| Σ |(ro2sadn - ro2sadn-1 )|/Σ |(sglmdn - sglmdn-1 )| | ≤ 10 (except for PZEV model) ≤ 8 (PZEV model) |
Time Needed for Diagnosis: 30 - 55 seconds
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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.