2004 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. CHECK FUEL PUMP OPERATION 
    1. Connect a hand-held tester to the DLC3.
    2. Turn the ignition switch ON and hand-held tester main switch ON.
      NOTE: Do not start the engine.
    3. Select the active test mode on the hand-held tester.
    4. Please refer to the hand-held tester operator's manual for further details .
    5. If you have no hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See  7 ).
      Fig 1: Connecting Hand-Held Tester To DLC3
      G02878884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Check that there is pressure in the fuel inlet hose from the fuel filter.

      HINT:

      If there is fuel pressure, you will hear the sound of fuel flowing. If there is no pressure, check these parts:

      • Fusible link
      • Fuses
      • EFI main relay
      • Fuel pump
      • ECM
      • Wiring connections
      Fig 2: Checking Pressure In Fuel Inlet Hose
      G02878885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Turn the ignition switch to LOCK.
    8. Disconnect the hand-held tester from the DLC3.
  2. CHECK FUEL PRESSURE 
    1. Check the battery positive voltage is above 12 V.
    2. Disconnect the negative (-) terminal cable from the battery.
    3. Purchase the new No.1 fuel pipe and take out the fuel tube connector from its pipe.

      Part No. 23801-20070

      Fig 3: Identifying Fuel Tube Connector
      G02878886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the fuel hose clamp.
      Fig 4: Removing Fuel Hose Clamp
      G02878887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Disconnect the No.1 fuel pipe (fuel tube connector) from the fuel filter outlet.
      CAUTION:
      • Perform disconnecting operations of the fuel tube connector (quick type) after observing the precautions (See PRECAUTION ).
      • As there is retained pressure in the fuel pipe line, prevent it from splashing inside the engine compartment.
Factory Service Tools

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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.