On Board Diagnosis Logic

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

Fig 1: Identifying Correct Output Heated Oxygen Sensor 1

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

Fig 2: DTC Detecting Condition And Possible Causes

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