Vacuum Diagrams: Introduction

This article contains underhood views or schematics of vacuum hose routing. Use these vacuum diagrams during visual inspection in BASIC DIAGNOSTIC PROCEDURES article. This will assist in identifying improperly routed vacuum hoses which cause driveability and/or computer-indicated malfunctions.

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

Fig 1: Emission Control System Vacuum Diagram (Saab 900 2.0L Turbo A/T)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 2: Emission Control System Vacuum Diagram (Saab 900 2.0L Turbo M/T)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 3: Emission Control System Vacuum Diagram (Saab 900 2.3L)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 4: Emission Control System Vacuum Diagram (Saab 900 2.5L V6)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 5: Emission Control System Vacuum Diagram (Saab 9000 2.3L High Output Turbo - VIN R)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 6: Emission Control System Vacuum Diagram (Saab 9000 2.3L Low Pressure Turbo - VIN U)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.

Fig 7: Emission Control System Vacuum Diagram (Saab 9000 3.0L V6)

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Courtesy of SAAB-SCANIA OF AMERICA, INC.