DTC P0036: Ho2S Heater Control Circuit Sensor 2: Description
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
The heating elements inside the Heated Oxygen Sensors (HO2S) minimize the time required for the sensors to reach operating temperature, and then provide an accurate voltage signal. The Powertrain Control Module (PCM) controls the HO2S heater operation with a low side driver. The HO2S bank 1 sensor 2 heater diagnostic monitors the current draw through the HO2S low side driver. The sensor receives power from a fused ignition 1 voltage circuit. If the PCM detects that the HO2S bank 1 sensor 2 heater low control circuit condition is incorrect, DTC P0036 will set.