Abnormality Judgment
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- Judge NG when the judgment value is larger than the threshold value after fuel shut-off in deceleration. Response time (Diagnosis value) > Threshold value --> AbnormalNOTE: Variation time of rear oxygen sensor output voltage is short during fuel shut-off in deceleration. Carry out the NG judgment only after the fuel shut-off in deceleration. As for OK judgment, without the condition of fuel shut-off in deceleration, judge OK if the value is below the threshold value.
Judge NG when the malfunction criteria below are completed in 2 seconds after the recovery of fuel shut-off in deceleration which requires 6 seconds or more.
- Judge NG when the 02 sensor voltage after recovery of fuel shut-off in deceleration is large. Judge NG when fuel shut-off in deceleration is also long (6s or more), and although carried out the fuel shut-off in deceleration cut return, when 02 sensor voltage is large (more than 0.55 V).
Judgment Value
JUDGMENT VALUE REFERENCE (ABNORMALITY)
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from rich (500 mV 02 output) to lean (300 mV) if voltage reduces from 550 mV to 250 mV. | > 0.698 seconds |
| Or | |
| More than 550 mV time | > 2 seconds |
Time Needed for Diagnosis: Once
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Judge NG when the judgment value is larger than the threshold value after recovery of fuel shut-off in deceleration.
Response time (Diagnosis value) > Threshold value --> Abnormal
- Judge NG when the 02 sensor voltage after recovery of fuel shut-off in deceleration is small.
Judgment Value
JUDGMENT VALUE REFERENCE (ABNORMALITY)
| Malfunction Criteria | Threshold Value |
|---|---|
| Shortest time change from lean (300 mV 02 output) to rich (500 mV) if voltage reduces from 500 mV to 250 mV. | > 2 seconds |
| Or | |
| Longest time to change to 250 mV | > 120 seconds |
Time Needed for Diagnosis: Once
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.