89661-0R101 TOYOTA Computer Module (ECM / ECU)

Overview

The 89661-0R101 is an engine control module (ECM/ECU) for Toyota vehicles. This electronic control unit manages engine functions such as fuel injection, ignition timing, emissions controls and diagnostics. Replacing a faulty ECM restores proper engine management, drivability and diagnostic capability.

Key features

OEM part number: 89661-0R101
Function: Engine Control Module (ECM / Electronic Control Unit)
Controls: fuel injection, ignition timing, emissions systems, sensor inputs and diagnostics
Improves: engine performance, fuel economy and emissions compliance (when properly programmed)
Diagnostics: supports on-board diagnostics and check-engine code reporting

Compatibility & fitment

Fits select Toyota vehicles – always verify fitment before purchase.
Confirm the part number (89661-0R101) and your vehicle VIN with the seller or a dealer to ensure compatibility.
Some ECMs are specific to engine type, transmission and vehicle options; incorrect ECMs may require reprogramming or may not function.

Condition & testing

Units may be offered new, remanufactured/refurbished, or used. Condition should be specified in the listing.
Rebuilt or used modules should be fully bench-tested to verify core functions before shipping. Ask the seller for test results or warranty details.

Programming & installation

Most ECMs must be programmed or matched to the vehicle (immobilizer, VIN and custom adaptations). A professional installer, dealer or specialized shop is usually required.
Do not attempt to install an ECM without confirming programming requirements – incorrect installation may prevent the vehicle from starting.
Installation steps typically include: physical mounting, electrical connections, and ECU programming/scanning to clear codes and pair with immobilizer and vehicle systems.

What’s included

1 × ECM/ECU (part number 89661-0R101) unless otherwise stated in the listing.
Additional items such as mounting hardware, connectors or programming cables are not usually included unless specified.

Warranty & returns

Warranty terms vary by seller – request details before purchase.
For remanufactured/used units, ask about core return requirements and any exchange programs.