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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 P0101-P0103 >> 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 DTC P0641, P0651, P0697, P06A3, P06D2 is not set.
    • Go to next step : If none of the DTCs are set 
  3. If you were sent here from DTC P0068, P0101, P0106, P0121, P01101 - Refer to : Circuit/System Testing.
  4. Verify the scan tool parameter : Throttle Body Idle Air Flow Compensation Less than 90%
    • Go to next step : If less than 90% 
  5. Perform the scan tool control function : Throttle Sweep - Start

    Verify the scan tool parameter : Throttle Position Sensors 1 and 2 = Agree

    • Go to next step : If the specified state 
  6. Verify the scan tool parameter : MAP Sensor = The value should be within the range listed in the table : Altitude Versus Barometric Pressure
    • Go to next step : If in the specified range 
  7. Engine - Idling - At normal operating temperature
  8. Verify the scan tool parameter : MAP Sensor = 26 to 52 kPa (3.8 to 7.5 PSI) - The value should change with accelerator pedal input.
    • Go to next step : If in the specified range and changes 
  9. Verify the scan tool parameter : MAF Sensor = 2.5 to 5.5 g/s
    • If not in the specified range 

      Refer to : Circuit/System Testing

    • Go to next step : If in the specified range 
  10. Increase the engine speed slowly to 3k RPM and then back to idle.
  11. Perform the scan tool function : Review Stored Data
  12. Observe the scan tool parameter frame by frame with a scan tool : MAF Sensor

    Verify the parameter changes smoothly and gradually in the recorded data 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 
  13. Ignition/Vehicle & All vehicle systems - Off
  14. Verify the following conditions do not exist :
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element
    • B75C Multifunction Intake Air Sensor - Water intrusion
    • Air Cleaner Element - Dirty/Restricted
    • Exhaust System - Loose/Missing components/Restricted/Visible Damage - Refer to : Symptoms - Engine Exhaust
    • Intake Air Duct - Collapsed/Loose Clamps/Restricted/Visible Damage
    • Charge Air Cooler - Leaking / Loose Clamps/ Restricted/Visible Damage
    • Intake Manifold - Cracked/Loose Clamps/Visible Damage - Refer to : Intake Manifold Cleaning and Inspection
    • Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  15. 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 is set 

      Refer to : Circuit/System Testing

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