Fuel Pressure Regulator Vacuum Switching Valve (VSV)

1. Disconnect electrical connector and vacuum hoses from fuel pressure regulator VSV. See PRESSURE REGULATOR VSV LOCATION table. Measure resistance between VSV terminals. If resistance is 33-39 ohms, go to next step. If resistance is not as specified, replace VSV.
2. Check for continuity between VSV case and each terminal of VSV (this checks for an internal short). If continuity does not exist, go to next step. If continuity exists, replace VSV.
3. Blow air through port "E" of VSV. See Fig 1. Air should flow out of port "G". Apply battery voltage across VSV terminals. Blow air through port "E". Air should flow out of filter. If VSV does not operate as specified, replace VSV.

FUEL PRESSURE REGULATOR VSV LOCATION

Application	Location
Fuel Pressure Regulator VSV	Near Fuel Pressure Regulator

Fig 1: Ports On Fuel Pressure Regulator VSV & EGR VSV Ports ID

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