Initial Inspection and Diagnostic Overview

1. Visually inspect EGR system components:
^ Loose, leaking, or damaged vacuum lines
^ EGR valve stuck open
^ EGR valve attaching bolts loose or missing
^ EGR valve flange gasket damaged or leaking
^ Damaged connectors
^ Damaged insulation
^ Damaged components that affect EGR
^ Damaged EGR components

2. Exercise the wiring harness and connectors for EGR components. Check for looseness, corrosion, or other damage. This must be done until the engine reaches operating temperature for activation of all EGR system components.
3. Check vacuum lines and connections for looseness, pinching, leakage, splitting, blockage, or liquid contamination.
4. If system inspection is okay, proceed to Pinpoint Tests.