Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1996 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE
Fuel Pressure Control System
- Fuel pressure control system uses a fuel pressure control Vacuum Switching Valve (VSV). Fuel pressure control VSV is supplied voltage through EFI main relay.
- Engine Control Module (ECM) will activate VSV by controlling ground circuit for 90-180 seconds when restarting engine at normal operating temperature. Locate and remove fuel pressure control VSV. See FUEL PRESSURE CONTROL VSV LOCATION table.NOTE: Fuel pressure control VSV may also be identified using appropriate illustration in THEORY/OPERATION article and wire color. See appropriate wiring diagram in WIRING DIAGRAMS article.FUEL PRESSURE CONTROL VSV LOCATION
Application Location Avalon Rear VSV Below Cover On Intake Manifold, Near Pressure Regulator On Fuel Rail & Contains Blue 2-Pin Electrical Connector - Using ohmmeter, ensure continuity exists between electrical terminals on fuel pressure control VSV and resistance is 33-39 ohms at 68°F (20°C). Replace fuel pressure control VSV if no continuity exists or resistance is not within specification.
- Ensure no continuity exists between each electrical terminal and body of fuel pressure control VSV. Replace fuel pressure control VSV if continuity exists between electrical terminal and body of fuel pressure control VSV.
- Apply air pressure to designated area and check that air flows from end of fuel pressure control VSV without battery connected. See Fig 1.
- Apply battery voltage and ground to electric terminals on fuel pressure control VSV and reapply air pressure. Air pressure should now flow from filter. See Fig 1. Replace fuel pressure control VSV if defective.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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