2004 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Engine Control System: ECM: Replacement

  1. REMOVE ENGINE ROOM ECU COVER 
    NOTE:
    • Wipe water off on the ECM cover and the circumference. 
    • Operation should be done indoors where it has no rain. 
    • Do not put any water into the inside of the engine control computer (connector part, screw part, etc). 
    1. Remove the 3 bolts and ECM cover.
  2. REMOVE ECM 
    1. Remove the 2 nuts.
    2. Disconnect the connector and remove the ECM.
  3. INSTALL ECM 
    NOTE:
    • "Operation when exchanging ECM" is necessary when the ECM is replaced. 
    • Check that there is no trash and foreign objects stuck in the ECM box side (adhesive side). 
    1. Connect the connector and install the ECM with 2 nuts.

      Torque: 5.5 N.m (55 kgf.cm, 48 in.lbf) 

  4. INSTALL ENGINE ROOM ECU COVER 
    1. Install the ECM cover with the 3 bolts.
Factory Service Tools

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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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