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TOYOTA Crown Engine Control Unit 89661-3F240 4AT2WDS – Full Guide and Compatibility

by Shiraz Amjad 16 Jul 2025
TOYOTA Crown Engine Control Unit 89661-3F240 4AT2WDS – Full Guide and Compatibility, AUTOMANSPAREPARTS, USED SPARE PARTS

If you're looking to replace or upgrade the Engine Control Unit (ECU) in your Toyota Crown, the part number 89661-3F240 with code 4AT2WDS is a genuine OEM unit used in several Crown models. In this blog, we will walk you through everything you need to know about this specific ECU, including its compatibility, functions, and whether it supports manual transmission.

What is ECU 89661-3F240?

The ECU, or Engine Control Unit, is the central component responsible for managing a vehicle’s engine performance, fuel injection, ignition timing, emissions, and overall driveability. The 89661-3F240 ECU is designed specifically for certain models of the Toyota Crown, particularly those with automatic transmissions.

  • OEM Part Number: 89661-3F240

  • Control Code: 4AT2WDS

  • Manufacturer: Toyota

  • Category: Engine Control Unit / Powertrain Control Module

  • Condition: Used and tested

  • Vehicle Type: Passenger vehicle – Toyota Crown

  • Fuel Type: Petrol

  • Transmission Support: Primarily Automatic

Compatibility Information

The Toyota Crown ECU 89661-3F240 4AT2WDS is typically installed in the following models:

Make Model Year Range Engine Displacement Transmission Type
Toyota Crown Athlete 2003–2008 2.5L / 3.0L petrol Automatic
Toyota Crown Royal 2003–2008 2.5L / 3.0L petrol Automatic
Toyota Crown Majesta 2004–2009 3.0L petrol Automatic

Important Note: This ECU is factory-programmed for vehicles with automatic transmission. It is not compatible with manual transmission systems without professional reprogramming, which is generally not recommended unless you are working with an advanced tuning specialist.

Is 89661-3F240 Compatible with Manual Transmission?

No, the 89661-3F240 (4AT2WDS) ECU is not designed for vehicles with manual transmissions. It includes software mappings, shift logic, and engine behavior optimizations that are tailored for automatic gearboxes. Installing this unit in a manual vehicle will likely result in system faults, warning lights, improper gear detection, and overall driveability issues.

If your Toyota Crown has a manual gearbox, you will need a different ECU programmed for manual transmission settings. Always cross-check with your vehicle's VIN and original part number to ensure compatibility.

Why Choose a Genuine Toyota ECU?

  • OEM Reliability: Genuine ECUs are built to Toyota's original specifications.

  • Plug-and-Play Fitment: When matched correctly, installation is straightforward.

  • No Programming Needed (If Matched): If you are replacing with the same part number, most units will work without additional coding.

  • Long-Term Durability: Used OEM parts from reliable suppliers like Automan Spare Parts undergo testing before shipping.

Buying Tips

Before purchasing an ECU for your Toyota Crown, follow these tips:

  1. Match the Part Number – Always match your old unit’s part number: 89661-3F240.

  2. Check the Control Code – The code 4AT2WDS should also match.

  3. Confirm Transmission Type – This ECU is strictly for automatic models.

  4. Consult a Mechanic – If unsure, ask a professional mechanic or scan your car’s original ECU to extract the correct details.

Shop with Confidence at Automan Spare Parts

At Automan Spare Parts, we supply 100% genuine and tested ECU units for various Japanese and European car models. Every unit we list is:

  • Fully tested before dispatch

  • Guaranteed for compatibility (when correct part number is matched)

  • Shipped with care and global delivery options

  • Covered under our satisfaction and warranty policy

Final Words

The Toyota Crown ECU 89661-3F240 4AT2WDS is a crucial component for maintaining optimal engine performance. Designed for automatic transmission vehicles, it offers seamless integration when properly matched. For Toyota Crown owners, replacing a faulty ECU with a genuine OEM unit is the best way to restore your vehicle’s performance and reliability.

If you are unsure whether this ECU fits your specific model, feel free to contact our expert support team or send us your existing part number.

Explore more tested ECUs and genuine Toyota parts at www.automanspareparts.com.

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