On Board Diagnosis Logic

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To judge the malfunction, the output from the heated oxygen sensor 1 is monitored to determine whether the "rich" output is sufficiently high and whether the "lean" output is sufficiently low. When both the outputs are shifting to the lean side, the malfunction will be detected.

Fig 1: Identifying Voltage Signal

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

Fig 2: DTC Detecting Condition Table

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