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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LSY) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0030-P0032, P0036-P0038, P0054, P0135, P0141, P103B, or P103C >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Engine - Idling - At normal operating temperature
    2. NOTE:

    This step only applies to the following component DTCs: HO2S Heater

  2. Verify DTC P103B, P103C is not set and no other DTCs are set.
    • If DTC P103B, P103C is set and other DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • If DTC P103B, P103C is not set and other DTCs are set 

      Refer to: Circuit/System Testing - Test 1

    • If DTC P103B, P103C is set and no other DTCs are set 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If no DTC is set 
  3. Verify the scan tool parameter:
    • HO2S 1, 2 Heater Control Circuit High Voltage Test Status = OK or Not Run
    • HO2S 1, 2 Heater Control Circuit Low Voltage Test Status = OK or Not Run
    • HO2S 1, 2 Heater Control Circuit Open Test Status = OK or Not Run
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  4. Verify the scan tool parameter:
    • HO2S 1 Heater = 0.3 to 4.3 A
    • HO2S 2 Heater = 0.3 to 2.5 A
    • If not the specified values 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified values 
  5. Verify the scan tool parameter: HO2S 1, 2 Heater = The value should not spike or drop out.

    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 the value spikes or drops out 

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

    • Go to next step: If the value does not spike or drop out 
  6. 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 

      Repeat step 2

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