On Board Diagnosis Logic (With CONSULT-II)

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Under the condition in which the heated oxygen sensor 1 signal is not input, the ECM circuits will read a continuous 0.3V. Therefore, for this diagnosis, the time that output voltage is within 200 to 400 mV range is monitored, and the diagnosis checks that this time is not inordinately long, see Fig 1.

For possible causes of a slow response time, see Fig 2.

Fig 1: Identifying Heated Oxygen Sensor 1 Response Time For DTC P0134 Or DTC P0154

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

Fig 2: Identifying Possible Causes For DTC P0134 Or P0154: HO2S1

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