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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 2.5L (LCV) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0171 or P0172 >> 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. Verify there are no DTCs set related to the following component/system:
    • B52 Heated Oxygen Sensor
    • B65 Intake Manifold Pressure and Air Temperature Sensor
    • B74 Manifold Absolute Pressure Sensor
    • B75C Multifunction Intake Air Sensor
    • B198 Fuel Composition Sensor
    • Q12 Evaporative Emission Purge Solenoid Valve
    • Q17 Fuel Injector
    • Q38 Throttle Body
    • Engine Misfire
    • Go to next step: If a related DTC is not set 
  3. 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 DTC P0171, P0172 is not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If no DTC is set 
  4. All OK.
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