Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2002 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Section 351 (Engine Control System): ECM: Replacement
WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- 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).
- Remove the 3 bolts and ECM cover.
- REMOVE ECM
- Remove the 2 nuts.
- Disconnect the connector and remove the ECM.
- 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).
- Connect the connector and install the ECM with 2 nuts.
Torque: 5.5 N.m (55 kgf.cm, 48 in.lbf)
- INSTALL ENGINE ROOM ECU COVER
- 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.