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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P0010 To DTC P0230) >> DTC P0016 (with LY6, L76) >> Circuit/System Testing (with LY6, L76)

Circuit/System Testing (with LY6, L76)

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IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Inspect the engine front cover area, or review the service history of the vehicle for any recent repairs involving the timing chain, timing chain tensioner, camshaft, crankshaft, camshaft actuator, or sprockets.
    2. IMPORTANT: Incorrect engine oil viscosity, aftermarket engine oil additives, or engine oil that is overdue for changing, can greatly affect the performance of the camshaft actuator.
  2. Monitor the engine oil pressure parameter value with a scan tool. The engine oil pressure must be at or above the minimum hot oil pressure values. Refer to Engine Mechanical Specifications (RPO LY2 VIN C) or Engine Mechanical Specifications (RPO LMG VIN 0) or Engine Mechanical Specifications (RPO LY5 VIN J) or Engine Mechanical Specifications (RPO LC9 VIN 3) or Engine Mechanical Specifications (RPO L76 VIN Y) or Engine Mechanical Specifications (RPO LY6 VIN K) or Engine Mechanical Specifications (RPO L92 VIN 8) .
    • If the engine oil pressure is low, correct the cause of the low oil pressure condition first.
  3. Remove the engine front cover, refer to Engine Front Cover Removal (RPO LY2/LC9/LY5/LMG) or Engine Front Cover Removal (RPO LY6/L76/L92) and inspect the timing chain, timing chain tensioner, and sprockets for wear or damage. Refer to Camshaft Timing Chain and Sprocket Cleaning and Inspection .
    • If any components are worn or damage, replace as necessary. If the all the components test normal, replace the CMP actuator assembly.
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