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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P219A >> 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 there are no DTCs set related to the following component/system:
    • B23 Camshaft Position Sensor
    • B34 Engine Coolant Temperature Sensor
    • B52 Heated Oxygen Sensor
    • B66 Intake Air Temperature Sensor
    • B74 Manifold Absolute Pressure Sensor
    • B75C Multifunction Intake Air Sensor
    • Q17 Fuel Injector
    • Q38 Throttle Body
    • Engine Misfire
    • Evaporative Emission (EVAP) System
    • Fuel Trim System
    • Go to next step: If a related DTC is not set 
  3. Verify the scan tool parameter: MAP Sensor = 20 to 48 kPa (2.9 to 7 PSI)
    • Go to next step: If in the specified range 
  4. Verify the following conditions do not exist:
    • Exhaust System - Leaking/Missing components/Restricted - Refer to Symptoms - Engine Exhaust
    • Fuel - Contaminated/Poor Quality - Refer to Alcohol/Contaminants-in-Fuel Diagnosis 
    • Fuel Injectors - Leaking/Restricted - Refer to Fuel Injector Diagnosis 
    • Ignition System - Malfunction - Refer to Electronic Ignition System Diagnosis 
    • Intake Air Duct - Leaking/Loose Clamps/Poor Connection/Restricted/Visible Damage
    • Intake Manifold - Vacuum leak
    • Mass Airflow Sensor - Contamination of the measuring element/Water intrusion
    • Mechanical Condition @ Engine - Altered air flow

      For example:

      • Exhaust Port or Intake Port @ Cylinder Head - Casting Flash/Restrictions
      • Exhaust Valve or intake Valve - Leaking/Stuck
      • Intake Manifold - Casting Flash/Restrictions/Vacuum leak
    • Positive Crankcase Ventilation System - Incorrect connection/Leaking/Restricted -
    • Vacuum Hoses - Incorrect connection/Kinked/Leaking/Restricted
    • If a condition exists - Repair or replace as necessary 
    • Go to next step: If no condition exists 
  5. 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 DTC P219A is not set.

    • If the DTC sets 

      A condition with the system still exists - Refer to Step 3

    • Go to next step: If no DTC is set 
  6. All OK.
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