2004 Lexus ES 330FACTORY OEM SERVICE PROCEDURE

ECM (3MZ-FE): Replacement

  1. DISCONNECT ENGINE WIRE NO. 3 (BATTERY NEGATIVE TERMINAL) 
  2. REMOVE FRONT DOOR SCUFF PLATE RH (See  INSTRUMENT PANEL SAFETY PAD SUB-ASSY  ) 
  3. REMOVE INSTRUMENT PANEL UNDER COVER SUB-ASSY NO. (See  INSTRUMENT PANEL SAFETY PAD SUB-ASSY  ) 
  4. REMOVE INSTRUMENT PANEL SUB-ASSY LOWER (See  INSTRUMENT PANEL SAFETY PAD SUB-ASSY  ) 
  5. REMOVE STEREO COMPONENT AMPLIFIER ASSY 
    1. Disconnect the 3 stereo component amplifier connectors.
    2. Remove the 2 nuts, then remove the stereo component amplifier.
      Fig 1: Removing Stereo Component Amplifier Assy
      G00919781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE ECM 
    1. Remove the wire harness clamp.
    2. Disconnect the 5 ECM connectors.
    3. Remove the 2 nuts, then remove the ECM.
      Fig 2: Removing ECM
      G00919782Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE ECM BRACKET 
    1. Remove the 2 screws, then remove the ECM bracket.
      Fig 3: Removing ECM Bracket
      G00919783Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE ECM BRACKET NO. 2 
    1. Remove the 2 screws, then remove the ECM bracket No. 2.
      Fig 4: Removing ECM Bracket No. 2
      G00919784Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE ECM BRACKET NO. 3 
    1. Remove the 2 screws, then remove the ECM bracket No. 3.
      Fig 5: Removing ECM Bracket No. 3
      G00919785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. INSTALL ECM BRACKET NO. 3 
  11. INSTALL ECM BRACKET NO. 2 
  12. INSTALL ECM BRACKET 
  13. INSTALL ECM 

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

  14. INSTALL STEREO COMPONENT AMPLIFIER ASSY 

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

  15. INSTALL INSTRUMENT PANEL SUB-ASSY LOWER 
  16. INSTALL INSTRUMENT PANEL UNDER COVER SUB-ASSY NO. 1 
  17. INSTALL FRONT DOOR SCUFF PLATE RH 
  18. CONNECT ENGINE WIRE NO. 3 (BATTERY NEGATIVE TERMINAL) 

    Torque: 5.4 N.m (55 kgf.cm, 48 in.lbf) 

  19. RESET MEMORY 
  20. SYSTEM INITIALIZATION (See  PRECAUTION  ) 
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.