Circuit Description

Powertrain Control Module (PCM) supplies about .45 volt to Oxygen Sensor 1 (O2S 1). O2S 1 supplies a varying voltage from about one volt when exhaust is rich to about .1 volt when exhaust is lean. PCM monitors and stores sensor voltage information and evaluates voltage samples to determine amount of time sensor voltage is out of range. If PCM detects O2S 1 voltage remains at or near .45 volt for an extended period, DTC will set.

Conditions for setting this DTC are:

• DTCs P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0200, P0300, P0301, P0302, P0303, P0304, P0341, P0404, P0506, P0507, P0601 and P0602 not set.
• Engine coolant temperature is greater than 158°F (70°C).
• Airflow is greater than 3 grams per second.
• Engine run time is greater than 30 seconds.
• TP sensor angle is 4-56 percent for 30 seconds.
• O2S 1 voltage is 399-499 mV.