Cylinder Deactivation (Active Fuel Management) System Diagnosis. Chevrolet Silverado

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Silverado - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Cylinder Deactivation (Active Fuel Management) System Diagnosis

Important: Cylinder Deactivation (Active Fuel Management) System Diagnosis is applicable for RPO LH6/LMG/LY5/LC9/L76.

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