Heated Oxygen Sensor (HO2S)
The heated oxygen sensors are mounted in the exhaust manifold and pipe. HO2S sensor uses a built-in heating circuit. The heating circuit is used to bring the HO2S sensor up to operating temperature, enabling faster conversion to closed-loop operation.
HO2S monitors oxygen content of exhaust gases. When HO2S is at operating temperature, a signal between zero and 1.1 volts is produced. A signal less than .4 volts is produced when there is a high oxygen content in exhaust gases (lean air/fuel ratio). A signal of .6 volts or more is produced when there is a low oxygen content in exhaust gases (rich air/fuel ratio). Signal is transmitted to the PCM and is translated into a rich or lean mixture signal
Aug 30, 2009 at 9:16 PM
