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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 P0102 or P0103 >> Circuit/System Verification

Circuit/System Verification

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  1. Engine - Idling - At normal operating temperature
  2. Verify the scan tool parameter: MAF Sensor = 2.5 to 5.5 g/s
    • If not between 2.5 and 5.5 g/s 

      Refer to: Circuit/System Testing

    • Go to next step: If between 2.5 and 5.5 g/s 
  3. Monitor the scan tool parameter: MAF Sensor

    Perform the following steps:

    1. Engine idling.
    2. Increase the engine speed slowly to 3 000 RPM and then back to idle.
    3. Review Stored Data
    4. While reviewing the data frame by frame, the parameter should change smoothly and gradually as the engine speed was increased and decreased.
    • If the value does not change smoothly and gradually 

      Refer to: Circuit/System Testing

    • Go to next step: If the value changes smoothly and gradually 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to: Circuit/System Testing

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