2003 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Section 249 (Engine Control System (SFI) (2AZ-FE)): ECM: Replacement

WARNING: This page is about a different car, the 2004 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.
  1. DISCONNECT BATTERY NEGATIVE TERMINAL 
  2. REMOVE FRONT DOOR SCUFF PLATE RH (See  REPLACEMENT  ) 
  3. REMOVE COWL SIDE TRIM SUB-ASSY RH (See  REPLACEMENT  ) 
  4. REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO. 1 (See  REPLACEMENT  ) 
  5. REMOVE INSTRUMENT PANEL FINISH LOWER PANEL RH (See  REPLACEMENT  ) 
  6. REMOVE ECM 
    1. Remove the 2 wire harness clamps.
      Fig 1: Removing Wire Harness Clamps
      G02852837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 5 ECM connectors.
    3. Remove the 2 nuts and ECM.
  7. REMOVE ECM BRACKET 
    1. Remove the 2 screws and ECM bracket.
    Fig 2: Removing ECM Bracket
    G02852838Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE ECM BRACKET NO. 2 
    1. Remove the 2 screws and ECM bracket.
      Fig 3: Removing ECM Bracket No. 2
      G02852839Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSTALL ECM BRACKET NO. 2 
    1. Install the ECM bracket with the 2 screws.
  10. INSTALL ECM BRACKET 
    1. Install the ECM bracket with the 2 screws.
    Fig 4: Installing ECM Bracket
    G02852840Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. INSTALL ECM 
    1. Install the 2 wire harness clamps.
    2. Connect the 5 ECM connectors.
    3. Install the ECM with the 2 nuts.

      Torque:  5.5 N.m (56 kgf.cm, 49 in..lbf)

    Fig 5: Installing ECM
    G02852841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSTALL INSTRUMENT PANEL FINISH LOWER PANEL RH (See  REPLACEMENT  ) 
  13. INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO. 1 (See  REPLACEMENT  ) 
  14. INSTALL COWL SIDE TRIM SUB-ASSY RH (See  REPLACEMENT  ) 
  15. INSTALL FRONT DOOR SCUFF PLATE RH (See  REPLACEMENT  ) 
  16. CONNECT BATTERY NEGATIVE TERMINAL 
  17. INITIALIZE SYSTEM (See  INITIALIZATION  ) 
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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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