Vacuum Diagrams: Introduction: Notes

This article contains underhood schematics of vacuum hose routing. Canada and some states or metropolitan areas in the United States require periodic emission, or Inspection/Maintenance (I/M) tests. Use these vacuum diagrams during a visual inspection for one of these tests. This will assist in identifying improperly routed vacuum hoses, which may cause driveability and/or computer-indicated malfunctions. To properly identify calibration code, "Catch Code" must be identified. The "Catch Code" is the 4 alpha/numeric characters located in parenthesis at the end of the calibration code. Example; 9-EQA-BBD 9 (BAX3). "BAX3" is the "Catch Code". The "Catch Code" tag is attached to PCM connector. See POWERTRAIN CONTROL MODULE LOCATION  table. On some models, "Catch Code" will also be located on either driver's side "A" pillar or inner fender.