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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 240 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0137, P0138, P013A, P013B, P013E, P013F, P2270, or P2271 >> Circuit/System Description

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 - Terminal 3 The control module input circuit has an internal resistance connected to ground.
Signal - Terminal 4 The control module input circuit has an internal resistance connected to 5 V.
Component Description
B52B Heated Oxygen Sensor 2 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.
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