2021 Lexus RC F BaseFACTORY OEM SERVICE PROCEDURE

Removal [09/2014 - ]: Procedure

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    NOTE:

    When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

    Refer to INITIALIZATION [09/2014 - 08/2016] , or refer to INITIALIZATION [08/2016 - 11/2017] , or refer to INITIALIZATION [11/2017 - 03/2019] , or refer to INITIALIZATION [03/2019 - 01/2023] , or refer to INITIALIZATION [01/2023 - 10/2023] , or refer to INITIALIZATION [10/2023 - ]

  2. REMOVE COOL AIR INTAKE DUCT SEAL 

    Refer to PROCEDURE - Step 1 [09/2014 - 11/2017] , or refer to PROCEDURE - Step 1 [11/2017 - 03/2019] , or refer to PROCEDURE - Step 1 [03/2019 - 01/2023] , or refer to PROCEDURE - Step 1 [01/2023 - ]

  3. REMOVE ENGINE ROOM ECU COVER 
    NOTE:
    • Remove all water on and around the engine room ECU cover.
    • Perform the inspection indoors to avoid rain.
    • Be sure to prevent water intrusion to the ECM (connectors and screw parts).
    1. Remove the 3 bolts and engine room ECU cover.
      GTY515705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. DISENGAGE WIRE HARNESS 
    1. Disconnect the engine wire harness connector (A) as shown in the illustration.
      GTY514631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 2 engine wire harness connectors (B).
    3. Using a screwdriver, disengage the claw.
      GTY515707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disengage the guide and disconnect the connector holder from the engine room ECU box.
    5. Disconnect the 6 ECM connectors and disengage the wire harness from the engine room ECU box.
      GTY515747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      After disconnecting the ECM connectors, make sure that dirt, water or other foreign matter does not contact the connecting parts of the ECM connectors.

    6. Disconnect the transmission control ECU assembly connector.
      GTY515708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Disengage the wire harness clamp.
      GTY515709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Disengage the wire harness from the engine room ECU box.
  5. REMOVE ECM 
    1. Remove the 2 nuts and ECM from the engine room ECU box.
      NOTE:

      If the ECM has been struck or dropped, replace it.

      GTY515706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE NO. 1 ECM BRACKET 
    1. Remove the 2 screws and No. 1 ECM bracket from the ECM.
      GTY417832Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE NO. 2 ECM BRACKET 
    1. Remove the 2 screws and No. 2 ECM bracket from the ECM.
      GTY404553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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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