Vapor Pressure Sensor Vacuum Switch Valve

1. Disconnect vapor pressure sensor VSV vacuum hoses. VSV is mounted on top of EVAP canister. Apply air pressure to VSV port "E". See Fig 1. If air flows from port "G", go to next step. If air does not flow from port "G", replace VSV.
2. Apply battery voltage across VSV terminals. Blow air through port "E". If air flows out of port "F", VSV is functioning properly. If air does not flow from port "F", replace VSV.

Fig 1: Identifying Vapor Pressure Sensor VSV Ports

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