2002 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. CHECK FUEL PUMP OPERATION 
    1. Connect the LEXUS hand-held tester to the DLC3.
    2. Turn the ignition switch ON and LEXUS hand-held tester main switch ON.
      NOTE: Do not start the engine. 
    3. Select the active test mode on the LEXUS hand-held tester.
    4. Please refer to the LEXUS hand-held tester operator's manual for further details.
    5. If you have no LEXUS hand-held tester, connect the positive (+) lead form the battery to terminal 4 of the connector, and the negative (-) lead to terminal 5.
  2. CHECK FUEL PRESSURE 
    1. Check the battery positive voltage is above 12 V.
    2. Disconnect the negative (-) terminal cable from the battery.
    3. Remove the fuel pressure pulsation damper from the RH delivery pipe (See REPLACEMENT ).
      Fig 1: Connecting Positive (+) Lead Form Battery To Terminal 4 Of Connector & Negative (-) Lead To Terminal 5
      G00935539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Install the rear fuel pipe and SST (pressure gauge) to the delivery pipe with 3 lower gaskets and SST (union bolt).

      SST 09268-45014 (09268-41190, 90405-06167)

      Torque: 39 N.m (400 kgf.cm, 29 ft.lbf) 

    5. Wipe off any splattered gasoline.
    6. Reconnect the negative (-) terminal cable to the battery.
    7. Connect a LEXUS hand-held tester to the DLC3. (See step  1 in check fuel pump operation (a) to (e))
    8. Measure the fuel pressure.
      Fig 2: Installing Rear Fuel Pipe & SST (Pressure Gauge) To Delivery Pipe With Lower Gaskets & SST (Union Bolt)
      G00935540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Fuel pressure: 

      304 - 343 kPa (3.1 - 3.5 kgf/cm 2  , 44 - 50 psi) 

      If pressure is high, replace the fuel pressure regulator.

      If pressure is low, check these parts:

      • Fuel hoses and connections
      • Fuel pump
      • Fuel filter
      • Fuel pressure regulator
    9. Disconnect the LEXUS hand-held tester from the DLC3.
    10. Start the engine.
    11. Measure the fuel pressure at idle.

      Fuel pressure: 

      304 - 343 kPa (3.1 - 3.5 kgf/cm 2  , 44 - 50 psi) 

    12. Stop the engine.
    13. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

      Fuel pressure: 147 kPa (1.5 kgf/cm 2  , 21 psi) or more 

      If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

    14. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.

      SST 09268-45014

    15. Reinstall the fuel pressure pulsation damper to the RH delivery pipe (See REPLACEMENT ).
    16. Reconnect the negative (-) terminal cable to the battery.
    17. Check for fuel leaks.
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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.