Diagnostic Method
- Intermediate
When the oxygen sensor output voltage changes from 0.55 V (rich) to 0.15 V (lean), calculate the minimum response time for output change between 0.5 V and 0.2 V for the judgment criteria.
- Wide
When the oxygen sensor output voltage changes from 0.65 V (rich) to 0.05 V (lean), calculate the minimum response time for output change between 0.6 V and 0.1 V for the judgment criteria.
- Abnormality Judgment
- Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut. Response time (diagnosis value) > threshold value → abnormalNOTE: Perform NG judgment only during fuel cut, when exhaust gas apparently changes from rich → lean. Even without deceleration fuel cut, judge as OK if the value is below the threshold.
- Judge as NG when the oxygen sensor voltage at a deceleration fuel cut is large.
Judge as NG when oxygen sensor voltage is large even after a long period of deceleration fuel cut has completed.
- Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut. Response time (diagnosis value) > threshold value → abnormal
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from rich (0.5 V O2 output) to lean (0.2 V) when voltage reduces from 0.55 V to 0.15 V | > 491 ms |
| or Longest time over 0.55 V |
≥ 2000 ms |
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from rich (0.6 V O2 output) to lean (0.1 V) when voltage reduces from 0.65 V to 0.05 V | > Value from Map |
| or Longest time over 0.65 V |
≥ 2000 ms |
| Estimated temperature of rear oxygen sensor element when fuel cut starts °C (°F) | 0 (32) | 450 (842) | 480 (896) | 500 (932) | 1000 (1832) |
| Longest time in rich status after fuel cut (ms) | 2000 | 2000 | 2000 | 2000 | 2000 |
Time Needed for Diagnosis: 1 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
- Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition.
Response time (diagnosis value) ≤ threshold value → normal
- Do not judge as a normal condition.
Judge as OK and clear the NG if the following conditions are established.
- Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition.
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from rich (0.5 V O2 output) to lean (0.2 V) when voltage reduces from 0.55 V to 0.15 V | ≤ 491 ms |
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from rich (0.6 V O2 output) to lean (0.1 V) when voltage reduces from 0.65 V to 0.05 V | ≤ 2000 ms |
Time Needed for Diagnosis: 1 time(s)
When the oxygen sensor output voltage changes from 0.25 V (lean) to 0.55 V (rich), calculate the minimum response time for output change between 0.3 V and 0.5 V for the judgment criteria.
- Abnormality Judgment
- Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut. Response time (diagnosis value) > threshold value → abnormal
- If the oxygen sensor voltage is small after recovering from a deceleration fuel cut, and remains small, judge as NG.
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from lean (0.3 V O2 output) to rich (0.5 V) when voltage changes from 0.25 V to 0.55 V | > 4000 ms |
| or Longest time under 0.25 V |
≥ 120000 ms |
Time Needed for Diagnosis: 1 time(s)
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
- Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition.
Response time (diagnosis value) < threshold value → normal
- Do not judge as a normal condition.
Judge as OK and clear the NG if the following conditions are established.
- Regardless of a deceleration fuel cut, if the response time (diagnosis value) when the oxygen sensor voltage has changed from rich to lean is shorter than the threshold value (judgment value), judge as a normal condition.
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from lean (0.3 V O2 output) to rich (0.5 V) when voltage changes from 0.25 V to 0.55 V | ≤ 4000 ms |
Time Needed for Diagnosis: 1 time(s)