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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0030-P0032, P0036-P0038, P0050-P0054, P0056-P0060, P0135, P0141, P0155, or P0161 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On / Vehicle - In Service Mode
  2. Perform the scan tool control function : HO2S Heater Bank 1, 2 Sensor 1, 2 - On and Off

    Verify the scan tool parameter :

    • HO2S Heater Control Circuit High Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Low Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Open Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • If not the specified state 

      Refer to : Circuit/System Testing

    • Go to next step : If the specified state 
  3. Perform the scan tool control function : HO2S Heater Bank 1, 2 Sensor 1, 2 - On and Off

    Verify the component turns On and Off : B52 Heated Oxygen Sensor

    • If the component does not turn On and Off 

      Refer to : Circuit/System Testing

    • Go to next step : If the component turns On and Off 
  4. Verify the scan tool parameter :
    • HO2S Heater Control Circuit High Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Low Voltage Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • HO2S Heater Control Circuit Open Test Status Bank 1, 2 Sensor 1, 2 = OK or Not Run
    • Perform the action while monitoring the parameter :
    • Wiggle the harness and connector : B52 Heated Oxygen Sensor
    • Wiggle the harness and connector : K20 Engine Control Module
    • If not the specified state 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step : If the specified state 
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to : Circuit/System Testing

    • Go to next step : If the DTC is not set 
  6. All OK.
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