2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Engine Control System: ECM: Replacement

NOTE:
  • Wipe water off of the ECM cover and edges.
  • Replacement of the ECM should be performed indoors, away from rain.
  • No water should come into contact with the inside of the ECM. Connectors and screws should also be kept away from water.
  1. DISCONNECT BATTERY NEGATIVE TERMINAL 
  2. REMOVE ENGINE ROOM SIDE COVER 
    1. Remove the 3 clips and engine room side cover.
  3. REMOVE ECM COVER 
    1. Remove the 3 bolts and ECM cover.
  4. REMOVE ECM 
    1. Remove the 2 nuts.
    2. Disconnect the connector and remove the ECM.
  5. REMOVE ECM GASKET 
    1. Peel off the sponge part of the gasket.
      Fig 1: Removing ECM GASKET
      G01049408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Spray gasket remover or equivalent on the remaining tape of the gasket.
      NOTE: When using gasket remover or equivalent, cover the ECM connector with a shop rag.
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.