On Board Diagnosis Logic

Fig 1: Displaying On Board Diagnosis Logic Graph

Courtesy of NISSAN MOTOR CO., U.S.A.

To judge the malfunction of heated oxygen sensor 1, this diagnosis measures response time of heated oxygen sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and heated oxygen sensor 1 temperature index. Judgment is based on whether the compensated time [heated oxygen sensor 1 cycling time index] is inordinately long or not.

Fig 2: DTC Detecting Condition And Possible Causes

Courtesy of NISSAN MOTOR CO., U.S.A.