Circuit Description

Powertrain Control Module (PCM) supplies about .45 volt to Oxygen Sensor 1 (O2S 1). The O2S 1 varies voltage from about one volt when exhaust is rich to about .10 volt when exhaust is lean. PCM monitors and stores sensor voltage information and evaluates the 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 or time, DTC will set.

Conditions for setting this DTC are as follows:

• Engine coolant temperature is greater than 158°F (70°C).
• Listed conditions present for at least 47 seconds.
• No presence of Codes: P0107, P0108, P0112, P0113, P0117, P0118, P0121-P0123, P0300-P0304, P0562, P0563, P1441.
• TP sensor angle is 8-55 percent.
• O2S 1 voltage is 407-509 mV.