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Home >> Chevrolet >> 1999 >> Express 1/2 Ton Van V8-5.7L VIN R >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Vehicle Control Module >> Component Diagnostics
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Component Diagnostics

The component diagnostics are tests that monitor and evaluate the emission related input components and output components related to the control module. The control module tests the components, the components circuits, and the performance of these components.
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