2009 Lexus LS 460 AWDFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK FUEL PUMP OPERATION 
    1. Check the fuel pressure (see ON-VEHICLE INSPECTION ).

      HINT:

      If there is fuel pressure, you will hear the sound of fuel flowing.

    OK:  Go to step  10

    NG: Go to Next Step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CIRCUIT OPENING RELAY (C/OPN)) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream ON.
    3. Enter the following menus: Powertrain/Engine/Active Test/Activate the Fuel Pump Speed Control
    4. Check whether operating sounds can be heard while operating the relay using the Techstream.

      OK: 

      Operating sounds can be heard from relay. 

    OK:  Go to step  5

    NG: Go to Next Step 

  3. INSPECT CIRCUIT OPENING RELAY (C/OPN) 
    1. Remove the C/OPN relay from the engine room No. 2 relay block.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      3-5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3-5 When battery voltage applied to terminals 1 and 2 Below 1 Ω
    Fig 1: Inspecting Circuit Opening Relay (C/OPN)
    G06190101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE CIRCUIT OPENING RELAY (C/OPN)  (See CIRCUIT OPENING RELAY )

    OK: Go to Next Step 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the engine switch on (IG).
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      A14-5 (FC) - E3-1 (E1) Engine switch on (IG) 11 to 14 V
      3. Fig 2: Identifying E3 And A14 ECM Connectors
      G06190102Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM  (See REMOVAL )

    NG: CHECK AND REPLACE HARNESS OR CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - ECM, EFI-B FUSE) 

  5. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Inspect the ECM power source circuit (see ECM POWER SOURCE CIRCUIT ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  6. INSPECT FUEL PUMP RELAY (F/PMP)  (See INSPECTION PROCEDURE )

    NG: REPLACE FUEL PUMP RELAY (F/PMP)  (See FUEL PUMP RELAY )

    OK: Go to Next Step 

  7. INSPECT FUEL PUMP ASSEMBLY 
    1. Inspect the fuel pump resistance.
      1. Measure the resistance according to the value (s) in the table below.

        Standard resistance 

        STANDARD RESISTANCE SPECIFICATION

        Tester Connection Condition Specified Condition
        4-5 20°C (68°F) 0.2 to 3.0 Ω
    2. Inspect the fuel pump operation.
      1. Apply battery voltage to both terminals. Check that the pump operates.
        Fig 3: Identifying Fuel Pump Connector
        G06190103Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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