2004 Lexus ES 330FACTORY OEM SERVICE PROCEDURE

Hand-held tester

  1. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE CIRCUIT OPENING RELAY) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch to ON and turn the hand-held tester ON.
    3. Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
    4. Check the relay operation while operating it with the hand-held tester.

      Standard: Operating sound can be heard from the relay. 

    OK: Go to step   5 

    NG: GO TO NEXT STEP. 

  2. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the engine room J/B.
    2. Check for continuity in the circuit opening relay.

      Standard: 

      Fig 1: Circuit Opening Relay Terminals Continuity Chart
      G01438652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.