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Home >> Lexus >> 2001 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Fuel System >> Fuel Delivery >> Fuel Pump Operation (Using Lexus Scan Tool)
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Fuel Pump Operation (Using Lexus Scan Tool)

  1. Connect Lexus scan tool to Data Link Connector (DLC) No. 3. See Figure or Figure. Turn ignition on. Turn scan tool on. DO NOT start engine.
  2. Select ACTIVE TEST mode on scan tool. Using Lexus scan tool manufacturer's instructions, activate electric fuel pump. Observe pulsation damper at rear of fuel rail. Pulsation damper screw will rise if fuel pressure is present. Also, fuel pump operating sound can be heard or pulsations can be felt in fuel line near fuel rail if fuel pump is operating.
  3. If fuel pump does not operate, check for faulty fusible link/fuses. See appropriate wiring diagram in WIRING DIAGRAMS article. Check for faulty EFI main relay in fuse/relay box at left front of engine compartment. Check for faulty fuel pump, ECM or poor wiring connections.
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