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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Mechanical - 5.3L (L83) Or 6.2L (L86) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> Cylinder Deactivation (Active Fuel Management) System Diagnosis

Cylinder Deactivation (Active Fuel Management) System Diagnosis

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  1. Measure the engine oil level. Fill, as required.
  2. Inspect for diagnostic codes within the engine control module (ECM). Refer to Diagnostic System Check - Vehicle . Repair, as required.
  3. Verify proper engine oil pressure and operation of the active fuel management oil pressure relief valve. Refer to Oil Pressure Diagnosis and Testing .
  4. Verify proper operation of the active fuel management system components. Refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing .
  5. Remove the valve lifter oil manifold. Refer to Valve Lifter Oil Manifold Replacement .
  6. Verify proper operation of the valve lifter oil manifold. Refer to Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing .
  7. Replace the active fuel management valve lifters, as required. Both intake and exhaust lifters should be replaced in pairs. Refer to Valve Lifter Replacement .
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