2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. CHECK FOR FUEL PUMP OPERATION AND INSPECT FOR FUEL LEAK 
    1. Check fuel pump operation.
      1. Connect the Techstream to the DLC3.
      2. Turn the engine switch on (IG).
        NOTE: Do not start the engine.
      3. Turn the Techstream on.
      4. Enter the following menus. Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.
      5. Check for pressure in the fuel inlet tube from the fuel line Check that sounds of fuel flowing in the fuel tank can be heard If no sounds can be heard, check the instrument panel junction block, fuel pump, ECM and wiring connectors.
    2. Inspect for fuel leaks
      1. Check that there are no fuel leaks from the fuel system after performing any maintenance. If there is a fuel leak, repair or replace parts as necessary.
    3. Turn the engine switch off.
    4. Disconnect the Techstream from the DLC3.
  2. CHECK FUEL PRESSURE 
    1. Using a voltmeter, measure the battery voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      Positive terminal - Negative terminal Engine switch off 11 to 14 V
    2. Discharge the fuel system pressure (See FUEL SYSTEM )
    3. Disconnect the cable from the negative (-) battery terminal
    4. When checking the fuel pressure of the direct injection side

      Disconnect the fuel pump main tube.

      1. Remove the fuel hose connector cover.
        Fig 1: Locating Fuel Hose Connector Cover
        G05749901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Pinch the connector and pull the fuel tube (See FUEL SYSTEM )
      CAUTION:
      • Always read Precaution (See PRECAUTION ) before disconnecting the fuel tube connector (for quick type A).
      • The fuel tube may spray fuel as a result of pressure that remains in the tube. Do not allow fuel to be sprayed into 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.

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