2011 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    WARNING:

    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

  2. REMOVE FUEL RELIEF VALVE RELAY (Marking: RELIEF VLV) 
    1. Remove the engine room No. 1 relay block cover.
    2. Remove the fuel relief valve relay from the engine room No. 1 relay block.
  3. INSPECT FUEL RELIEF VALVE RELAY 
      Fig 1: Identifying Starter Cut Relay Terminals
      GTY120666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the resistance of the fuel relief valve relay.

      Standard resistance

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage is applied to terminals 1 and 2)

      If the resistance is not as specified, replace the relay.

  4. INSTALL FUEL RELIEF VALVE RELAY 
  5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
  6. PERFORM INITIALIZATION 
    1. Perform initialization. Refer to INITIALIZATION .
      NOTE:

      Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.

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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.