Fuel Pump Control Circuit: Sienna
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
For fuel pump control circuit inspection and wiring diagram, see Fig 1-Fig 4 . To check starter signal circuit, see STARTER SIGNAL CIRCUIT . To check ECM power source circuit, see ENGINE CONTROL MODULE POWER SOURCE CIRCUIT . To check circuit opening relay, see CIRCUIT OPENING RELAY under MODULES, MOTORS, RELAYS & SOLENOIDS. For circuit identification, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. To check fuel pump operation, see FUEL DELIVERY under FUEL SYSTEMS. Before replacing ECM, check ECM connectors and ground circuits. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS under COMPUTERIZED ENGINE CONTROLS.