Checking Fuel Pump Operation Using Scan Tool (Camry, Celica, RAV4, Tacoma, Tercel, T100 & 4Runner)
- Remove cover (if equipped) and connect scan tool to data link connector No. 3. See Figure-8. Turn ignition on. DO NOT start engine.
- Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump. Listen for fuel pump operating sound and feel for fuel pressure in fuel inlet line at fuel filter. Turn ignition off. Remove scan tool. If fuel pump operates, check fuel pressure. See FUEL PRESSURE (FUEL SYSTEM) .
- If fuel pump does not operate, EFI main relay or circuit opening relay may be defective. For relay application and explanation of relay operation, see FUEL PUMP CONTROL CIRCUIT under FUEL SYSTEM. For testing of EFI main relay or circuit opening relay, see SYSTEM/COMPONENT TESTS article.
- If relays are okay, check for defective fuses, fusible links or wiring circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If fuses, fusible links and wiring circuit are okay, check for defective fuel pump. See CHECKING FUEL PUMP OPERATION. BY APPLYING BATTERY VOLTAGE TO FUEL PUMP under FUEL SYSTEM.