Circuit/System Description
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
For an overview of the component/system, refer to: Heated Oxygen Sensor Description and Operation
| Circuit | Description |
|---|---|
| Signal | The control module input circuit has a high impedance and can float high or low when the circuit is open. |
| Component | Description |
|---|---|
| B52 Heated Oxygen Sensor | An oxygen sensor is an electronic device that measures the proportion of oxygen (O2) in the exhaust gas being analyzed. In addition to the hot exhaust gas, heated oxygen sensors have a resistor heating element to minimize the time required for the sensor to reach operating temperature. The ECM monitors the temperature and turns the heater on as necessary. |
| K20 Engine Control Module | The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly. |
Wideband oxygen sensors consist of two cells, a measuring cell and a pump cell. The voltage of the measuring cell, which depends on the oxygen concentration of the exhaust gas in the detection chamber, is compared with a target value of 450 mV (lambda = 1 corresponds to 450 mV). If this voltage deviates, then, by switching a pump current to the pump cell, as many oxygen ions are pumped into or out of the detection chamber as necessary for the voltage value of the measurement cell to once again correspond to 450 mV. This pump current is the measurement which describes the precise lambda value of the mixture almost linearly.