On Board Diagnosis Logic
To judge the malfunction of air fuel ratio (A/F) sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the air fuel ratio (A/F) sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F sensor 1 signal cycling time index) is inordinately long or not.
DTC DETECTING CONDITION CHART
| DTC No. | Trouble diagnosis name | DTC detecting condition | Possible Cause |
|---|---|---|---|
| P0133 0133 |
Air fuel ratio (A/F) sensor 1 circuit slow response | The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time. |
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