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.

The Engine Control Module (ECM) will activate VSV by controlling ground circuit for approximately 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 by wire color. See appropriate wiring diagram in WIRING DIAGRAMS article.

FUEL PRESSURE CONTROL VSV LOCATION

Application

Location

Land Cruiser

⁽¹⁾ Front Lower Side Of Air Intake Chamber, Near Dipstick

⁽¹⁾	Contains Brown 2-pin electrical connector.

Using ohmmeter, ensure continuity exists between electrical terminals on fuel pressure control VSV and resistance is within specification. See FUEL PRESSURE CONTROL VSV RESISTANCE SPECIFICATIONS table. 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.
Check fuel pressure control VSV operation by applying air pressure to designated area and check that air flows from the end of the fuel pressure control VSV without battery connected. See Fig 1.
Apply battery voltage and ground to electrical terminals on fuel pressure control VSV and reapply air pressure. Air pressure should now pass from the filter. See Fig 1. Replace fuel pressure control VSV if defective.

FUEL PRESSURE CONTROL VSV RESISTANCE SPECIFICATIONS

Application	Ohms @ 68°F (20°C)
Land Cruiser, LX450	37-44

Fig 1: Testing Fuel Pressure Control VSV