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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LS >> 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) Valve Lifter Oil Manifold Diagnosis And Testing

Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis And Testing

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Special Tools

For equivalent regional tools, refer to Special Tools

NOTE:
  • A minimum shop air source of 206 kPa (30 psi) is required for manifold testing.
  • A water bleed is located on the side of the EN-46999  tester. Occasionally, depress the valve in order to remove excess water from the tool.
Fig 1: Identifying Displacement On-Demand Tester
GM1479848Courtesy of GENERAL MOTORS COMPANY

The manifold bench test provides a maximum 206 kPa (30 psi) of filtered shop air to the manifold and will test each solenoid/valve for the following conditions:

  1. Individually depress each of the buttons 1 - 4 on the EN-46999  tester in order to activate each of the solenoid/valves. When activating each solenoid/valve, a loud click should be heard from the solenoid and an increased amount of air will exit the outlet ports.
    • Button 1 will energize the solenoid/valve 1 for engine cylinder number 1.
    • Button 2 will energize the solenoid/valve 2 for engine cylinder number 4.
    • Button 3 will energize the solenoid/valve 3 for engine cylinder number 6.
    • Button 4 will energize the solenoid/valve 4 for engine cylinder number 7.
  2. Do not lift the manifold assembly by the electrical lead frame.
    Fig 2: Valve Lifter Oil Manifold
    GM1536553Courtesy of GENERAL MOTORS COMPANY
  3. Connect EN-46999-18  active fuel management tester air adapter (9) to the air out hose (2) of the EN-46999  tester (5). This will make it possible to connect an air nozzle fitted with a standard 1/4 in NPT female air fitting. Verify the air supply switch (4) is in the off position.
    Fig 3: Active Fuel Management Tester, Air Adapter, Air Out Hose Air Supply Switch And Components
    GM3259546Courtesy of GENERAL MOTORS COMPANY
  4. Connect the air out hose (6) of the EN-46999  tester (5) to a shop air source.
  5. Connect the 12 volt power supply connectors (7) of the EN-46999  tester (5) to a 12 volt power supply. Verify the Power light (8) on the tool is illuminated. If the light on the tool is not illuminated when connected to a 12 volt power supply, test and/or replace the 3 amp fuse.
  6. Connect the EN-46999-20  active fuel management tester harness - small block V8 (3) to the tester. Connect EN-46999-20  active fuel management tester harness - small block V8 to the electrical connector of the manifold.
  7. Connect an air nozzle fitted with a tapered rubber tip to EN-46999-18  active fuel management tester air adapter (9). Hold the tip of the air nozzle in the oil passage directly below the Valve Lifter Oil Manifold Oil Filter (1).
  8. Turn the air supply switch of the EN-46999  tester to the ON position. With the air supply connected to the manifold assembly and the solenoid/valves in the closed position, a limited amount of air will exit from the outlet ports (1, 2) of the manifold.
    Fig 4: Turning Air Supply Switch Of Tester To ON Position
    GM3259547Courtesy of GENERAL MOTORS COMPANY
  9. Position the manifold assembly onto a bench at a 45 degree angle in order to test solenoid/valves 1 and 4.
    Fig 5: Solenoid/Valves And Manifold Outlet Ports
    GM3259549Courtesy of GENERAL MOTORS COMPANY
    NOTE: The manifold must be tested in the proper position to ensure the solenoid/valves operate as designed.
  10. Depress button number 1 on the tool to activate solenoid/valve 1. With button 1 depressed, the solenoid/valve (1) should open, allowing an increased amount of air to exit the outlet ports (2) of the manifold.
  11. Depress button number 4 on the tool to activate solenoid/valve 4. With button 4 depressed, the solenoid/valve (4) should open, allowing an increased amount of air to exit the outlet ports (3) of the manifold.
  12. Reposition the manifold assembly onto a bench at a 45 degree angle in order to test solenoid/valves 2 and 3.
    Fig 6: Solenoid/Valves And Manifold Outlet Ports
    GM3259552Courtesy of GENERAL MOTORS COMPANY
  13. Depress button number 2 on the tool to activate solenoid/valve 2. With button 2 depressed, the solenoid/valve (2) should open, allowing an increased amount of air to exit the outlet ports (4) of the manifold.
  14. Depress button number 3 on the tool to activate solenoid/valve 3. With button 3 depressed, the solenoid/valve (3) should open, allowing an increased amount of air to exit the outlet ports (1) of the manifold.
  15. When the test is completed, turn the air source switch on the EN-46999  tester to the off position and disconnect the tool from the 12 volt power supply, and shop air source. Disconnect air nozzle.
  16. If after testing, it has been determined that one or more of the solenoid/valves is not functioning properly, replace the manifold as an assembly.
  17. If after testing, it has been determined that the solenoid/valves are functioning properly, replace the valve lifters as required. Both intake and exhaust lifters should be replaced in pairs.
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