LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> 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. Engine - Idling
  2. Verify the scan tool parameter : MAF Sensor = Greater than 0 Hz
    • If 0 Hz or less 

      Refer to : Circuit/System Testing

    • Go to next step : If greater than 0 Hz 
  3. Verify DTC P0016, P007B-P007E, P00C7, P00E9, P00EA-P00EC, P0096-P0099, P0106-P0108, P0111-P0114, P0116-P0119, P0128, P0201-P0204, P020A-P020D, P0216, P02E8, P02E9, P0261, P0262, P0264, P0265, P0267, P0268, P026A, P0270, P0271, P0405, P0406, P049D, P0502, P0503, P062B, P062D, P062F, P0722, P0723, P10D5-P10D8, P122D, P12B0-P12B2, P12AF, P1248, P1249, P16A0-P16A2, P2004, P2006, P2008-P2010, P201B, P201D, P20F8, P2147, P2148, P2150, P2151, P2227-P2230 is not set.
    • Go to next step : If none of the DTCs are set 
  4. Increase the engine speed slowly to 3k RPM and then back to idle.
  5. Perform the scan tool function : Review Stored Data
  6. 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 
  7. Verify the scan tool parameter : MAF Sensor = The value should not spike or drop out.

    Perform the action while monitoring the parameter :

    • Wiggle the harness and connector : B75C Multifunction Intake Air 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 
  8. Perform the scan tool control function : Exhaust Gas Recirculation - Closed
  9. Verify the scan tool parameter : Induction System Leak Indication = 0.75 : 1 to 1.25 : 1 - Stable
    • If not in the specified range 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Verify the following conditions do not exist :
      • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Water intrusion/Leaking/Visible Damage
      • O-Ring @ B65 Intake Manifold Pressure and Air Temperature Sensor - Leaking/ Missing/Visible Damage
      • Q14 Exhaust Gas Recirculation Valve - Stuck Open/Leaking
      • 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
      • Intake Manifold - Cracked/Loose Clamps/Visible Damage - Refer to : Intake Manifold Cleaning and Inspection
      • Positive Crankcase Ventilation Oil Separator - Cracked/Leaking / Loose Clamps/Restricted
      • Charge Air Cooler - Leaking / Loose Clamps/ Restricted - Frozen /Visible Damage

        Refer to : Charge Air Cooler Diagnosis (Full System Leak Test) , or Charge Air Cooler Diagnosis (Induction System Smoke Test)

      • If a condition exists - Repair or replace as necessary
    • Go to next step : If in the specified range 
  10. 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 
  11. All OK.
scientia non olet · About LEMON Manuals