Fuel Pressure-Up System Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1990 Toyota Pickup, 1990 Toyota Cab & Chassis, 1990 Toyota 4Runner, 1989 Toyota Pickup, and 1989 Toyota Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Ensure coolant temperature sensor and air temperature sensor (in airflow meter) and circuits are operating correctly. See SENSORS & SWITCHES .
- Fuel pressure-up system is controlled by ECU through a vacuum switching valve. The vacuum switching valve is fed current through the EFI main relay when the ignition is turned on. ECU controls the ground circuit. ECU will activate vacuum switching valve for 90-180 seconds when restarting engine at normal operating temperature. To check operation, See Fig 1 or Fig 2 .
FUEL PRESSURE-UP VACUUM SWITCHING VALVE LOCATION
| Model | Location |
|---|---|
| Pickup/4Runner (22R-E) | On Top Of Valve Cover |
| Pickup/4Runner (3VZ-E) | Right Front Fender (Center Vacuum Switching Valve) |