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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls And Fuel - 2.7L (L3B) - Diagnostic Information And Procedures (1 Of 2)) >> 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 variant/trim than selected.

For an overview of the component/system, refer to Heated Oxygen Sensor Description and Operation

Circuit Description
Signal - Terminal 4 The control module input circuit has an internal resistance connected to 5 V.
Signal - Terminal 3 The control module input circuit has an internal resistance connected to ground.
Component Description
B52 Heated Oxygen Sensor When the engine is started, the ECM operates in an open loop mode, ignoring the oxygen sensor signal voltage while calculating the air to fuel ratio. While the engine runs, the sensor heats up and begins to generate a voltage within a range of 40 to 1050 mV. Once sufficient voltage fluctuation is observed by the ECM, closed loop is entered.
K20 Engine Control Module 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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