Abnormality Judgment
1. Judge as NG when the judgment value is larger than the threshold value after deceleration fuel cut.
Response time (diagnosis value) greater than Threshold value -> Abnormal
NOTE: 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.
2. 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.
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