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1. Remove the oil filter and install the EN-47971 (1). See Special Tools. 2. Install the J 21867 (2), or equivalent, to the EN-47971 (1). See Special Tools. Fig. 17: Oil Pressure Sensor 3. Remove the oil pressure sensor and install the J-21867-16 . See Special Tools. pan. Refer to Lubrication Description.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
Fig. 18: Measure Engine Oil Pressure 4. Install the J 21867 (1), or equivalent, to the J-21867-16 (2). See Special Tools. 5. Run the engine and measure the engine oil pressure while observing both gages. Operate the throttle, as required, to increase and decrease the engine oil pressure. With the engine running and the lower pressure gage (2) measuring below 379 kPa (55
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
same and the lower gage (2) has a higher reading, the active fuel management oil With the engine running and the lower pressure gage (2) measuring above 379 kPa (55 6. Repair, as required. CAMSHAFT POSITION ACTUATOR AND SOLENOID VALVE DIAGNOSIS AND TESTING 1. Measure the engine oil level. Fill, as required. 2. Using the scan tool, 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. Inspect the camshaft position (CMP) actuator solenoid valve for proper operation. Refer to Camshaft Position Actuator Solenoid Valve Inspection (On-Vehicle) or Camshaft Position Actuator Solenoid Valve Inspection (Off-Vehicle) . If valve inspection confirms proper movement of the spool, replace the CMP actuator If valve inspection confirms improper movement of the spool, replace only the CMP 5. Verify proper operation of the CMP actuator control system. Refer to Diagnostic Starting Point - Engine Controls . OIL LEAK DIAGNOSIS Step Action Yes No IMPORTANT: You can repair most fluid leaks by first visually locating the leak, repairing or replacing the 1 1. Operate the vehicle until it reaches normal operating temperature. 2. Park the vehicle on a level surface, over a large sheet of paper or other clean surface. 3. Wait 15 minutes.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
4. Inspect for drippings. Are drippings present? Go to Step 2 System OK 2 Can you identify the type of fluid and the approximate location of the leak? Go to Step 10 Go to Step 3 3 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to see areas. 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components Can you identify the type of fluid and the approximate location of the leak? Go to Step 10 Go to Step 4 4 1. Completely clean the entire engine and surrounding components. 2. Operate the vehicle for several kilometers, miles, at normal operating temperature and at varying speeds. 3. Park the vehicle on a level surface, over a large sheet of paper or other clean surface. 4. Wait 15 minutes. 5. Identify the type of fluid, and the approximate location of the leak. Can you identify the type of fluid and the approximate location of the leak? Go to Step 10 Go to Step 5 5 1. Visually inspect the suspected area. Use a small mirror to assist in looking at hard to see areas. 2. Inspect for leaks at the following locations: Sealing surfaces Fittings Cracked or damaged components
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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