Vacuum Diagrams: Introduction: Notes

This article contains underhood views or schematics of vacuum hose routing. Vacuum diagrams are an excellent tool for identifying improperly routed vacuum hoses. Improperly routed vacuum hoses cause driveability and computer-indicated malfunctions.

NOTE: Always refer to Emission Control label in engine compartment before attempting service. If manual and label differ, always use emission label vacuum hose routing.

NOTE: Starting with model year 2000 some Secondary Air Injection Systems do not use vacuum for actuation of system components.