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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 P0068 or P1101 >> Circuit/System Testing

Circuit/System Testing

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.
NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

  1. Verify the following conditions do not exist:
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Water intrusion/Cracked/Loose Clamps/Visible Damage
    • Q38 Throttle Body - Loose Clamps/Visible Damage
    • Air Cleaner Element - Dirty/Restricted
    • Catalytic Converter - Blocked/Restricted/Visible Damage
    • Intake Air Duct & Intake Manifold - Cracked/Loose Clamps/Restricted/Visible Damage - Refer to: Intake Manifold Cleaning and Inspection
    • O-Ring @ B17 Barometric Pressure Sensor/Leaking/Missing/Visible Damage
    • O-Ring @ B74 Manifold Absolute Pressure Sensor/Leaking/Missing/Visible Damage
    • Positive Crankcase Ventilation System - Leaking/Incorrect connection/Restricted
    • Vacuum Hoses - Kinked/Leaking/Incorrect connection/Restricted
    • Vacuum leak @ Engine/Intake Manifold/Q38 Throttle Body
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  2. Test or inspect for the following: - An engine mechanical condition
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  3. All OK.
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