2003 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Checking Fuel Pump Operation Using Scan Tool (RX300)

  1. Connect scan tool to Data Link Connector (DLC) No. 3, located under left side of instrument panel. 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.
  2. Listen for fuel pump operating sound and feel for fuel pressure in inlet line from fuel filter. Turn ignition off. Remove scan tool. If fuel pump operates, check fuel pressure. See FUEL PRESSURE . If fuel pump does not operate, check for defective fusible links/fuses, wiring or EFI main relay. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If fusible links/fuses, wiring and EFI main relay are okay, go to next step.
  3. Check for defective fuel pump. See CHECKING FUEL PUMP OPERATION BY APPLYING BATTERY VOLTAGE TO FUEL PUMP . Replace fuel pump as necessary and retest. If fuel pump operates, check fuel pump control circuit. See FUEL DELIVERY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - ES300 & RX300 article.
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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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