Displacement on Demand (DoD) System Diagnosis for Generic Unit Repair 2006

1. Check the engine oil level. Fill as required.
2. Using the scan tool, check for diagnostic codes within the engine control module (ECM). Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information. Repair as required.
3. Verify proper engine oil pressure and operation of the Displacement-on-Demand (DoD) oil pressure relief valve. Refer to Oil Pressure Diagnosis and Testing .
4. Verify proper operation of the DoD system components. Refer to Displacement on Demand (DoD) System Compression Test .
5. Remove the valve lifter oil manifold (VLOM). Refer to Valve Lifter Oil Manifold Removal .
6. Verify proper operation of the VLOM. Refer to Displacement on Demand (DoD) Valve Lifter Oil Manifold Diagnosis and Testing .
7. Replace the DoD valve lifters as required. Both intake and exhaust lifters should be replaced in pairs. Refer to Valve Lifter Removal .