9-7X V8-5.3L (2005)
Variable Valve Timing Actuator: Testing and Inspection
Displacement on Demand (Dod) Valve Lifter Oil Manifold Diagnosis and Testing
Displacement on Demand (DoD) Valve Lifter Oil Manifold Diagnosis and Testing
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Tools Required
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EN-46999 Displacement-on-Demand Tester
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EN-46999-1 Displacement-on-Demand Tester Air Adapter
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EN-46999-5 Displacement-on-Demand Tester Harness - Small Block V8
Important:
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This component test applies only to vehicles with functional displacement-on-demand.
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A minimum shop air source of 206 kPa (30 psi) is required for manifold testing.
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A water bleed is located on the side of the EN-46999. Occasionally, depress the valve in order to remove excess water from the tool.
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:
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Proper operation
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A stuck open condition - constant air flow
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A stuck closed condition - no air flow
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A flow restriction within the manifold
1. Individually depress each of the buttons 1-4 on the EN-46999 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.
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Button 1 will energize the solenoid/valve 1 for engine cylinder number 1.
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Button 2 will energize the solenoid/valve 2 for engine cylinder number 4.
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Button 3 will energize the solenoid/valve 3 for engine cylinder number 6.
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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.
