89661-02090 Engine Control Unit Toyota Corolla Geo Prizm ECU TN175700-5080

89661-02090 / TN175700-5080 / 8966102090 / TN1757005080 Engine Control Unit ECU Toyota Corolla / Geo Prizm 1993-1994.

Product Description

This OEM Engine Control Unit (ECU) with part number 89661-02090 (also referenced as TN175700-5080) is intended for use in the 1993-1994 Toyota Corolla or Geo Prizm with the 1.8 L engine. 

The unit controls key engine management functions including fuel injection, ignition timing, sensor monitoring, emission controls, and diagnostics. Many listings indicate it is offered as a “plug & play / programmed” replacement for vehicles matching the exact part number.

Before purchase and installation, it is essential to verify that your original ECU part number exactly matches 89661-02090 (or compatible superseded code), confirm your engine displacement (1.8 L), transmission type, and wiring harness compatibility. Some units may require programming or adaptation to your vehicle’s VIN or immobilizer.

Compatibility Table

Additional Notes & Buyer Tips

• It’s vital to match the exact part number — 89661-02090. Minor variation may lead to incompatibility even if the car model and year appear correct.

• Be aware that although many units are marketed as “plug & play,” some might still need programming (immobilizer, VIN coding) depending on region or previous vehicle history. For example: “Our 1993 Toyota Corolla ECM will come programmed to your vehicle’s specific VIN … No additional programming required” in one listing. 

• Because this part is used/refurbished often, check condition of the unit: connectors, pins, signs of corrosion or water damage.

• After installation, clear fault codes and confirm engine behavior: idle stability, sensor readings, no error lights.

• If your vehicle has a different engine displacement or transmission, this part may not be compatible even if the year and model match.