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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (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 car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  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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