2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Engine Control System - System & Component Testing, R & I: ECM: Installation

  1. INSTALL ECM 
    1. Install the ECM to the engine room ECU box with the 2 nuts.
      Fig 1: Locating ECM Nuts
      G05751914Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 5.5 N*m (56 kgf*cm, 4) in.*lbf) 

      NOTE:
      • Install the ECM on the ECM box with the label facing away from the engine.
      • Make sure that there is no foreign matter on the gasket surface of the ECM box.
      • Insert the stud bolt on the vehicle rear side to the ECM first.
      • Make sure that the stud bolts are securely installed into the front and rear bolt holes.
    2. Connect the 6 ECM connectors
      NOTE: Be sure to securely connect the connector.
    3. Connect the connector holder.
      Fig 2: Locating Connector Holder
      G05751916Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSTALL ENGINE ROOM ECU COVER 
    1. Install the ECM cover with the 3 bolts

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

      2. Fig 3: Locating ECM Cover Bolts
      G05751912Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL ENGINE ROOM SIDE COVER LH  (See INSTALLATION )
  4. INSTALL COOL AIR INTAKE DUCT SEAL  (See INSTALLATION )
  5. INSTALL V-BANK COVER SUB-ASSEMBLY  (See INSTALLATION )
  6. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
    NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See INITIALIZATION ).
  7. PERFORM INITIALIZATION 
    1. When replacing the ECM, some systems need to be initialized
  8. PERFORM RESET MEMORY 
    NOTE: Perform RESET MEMORY (AT initialization) when replacing the ECM (See INITIALIZATION ).

    HINT

    Initialization cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal

  9. PERFORM REGISTRATION 
    NOTE: Perform Registration (VIN registration) when replacing the ECM (See REGISTRATION ).

    HINT.

    Initialization cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.

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.