P0031 CHEVROLET – HO2S11 Heater Control Circuit Low Voltage

 

P0031: DIY Repairing Video Tutorial

https://youtu.be/B68pwfRlnQc

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0031 CHEVROLET Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P0031 CHEVROLET Possible Causes

  Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1,Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 harness is open shorted to ground,Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit poor electrical connection,Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit fuse,Faulty Powertrain Control Module (PCM)  

P0031 CHEVROLET Description

  Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Powertrain Control Module (PCM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The PCM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The PCM controls the heater element circuit by allowing current flow to ground. The PCM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.