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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P219A: Fuel Trim Cylinder Balance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Engine idling, transmission in Park or Neutral, verify the manifold absolute pressure (MAP) sensor parameter is between 20 - 48 kPa.
    • If not within the specified range  .

      Refer to DTC P0106 .

    • If within the specified range, inspect for the conditions listed below: 
    • Modified, damaged, leaking or restricted air induction system components.
    • Improperly operating crankcase ventilation system.
    • Split, kinked or improperly connected vacuum hoses.
    • Restricted, damaged, leaking or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust .
    • Improperly operating fuel injectors. Refer to Fuel Injector Diagnosis .
    • Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Excessive fuel in the crankcase due to leaking injectors. Change engine oil as necessary.
    • Improperly operating ignition system. Refer to Electronic Ignition System Diagnosis .
    • If a condition is found 

      Repair as necessary.

    • If no condition is found 
  2. Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
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