Toyota 89661 Ecu Pinout [work] May 2026

Toyota 89661 is a prefix for hundreds of different Engine Control Unit (ECU) part numbers used across various models like the Corolla, Celica, LS400, and Hilux. Because pinouts vary significantly by the specific engine and production year, you must identify the full part number (e.g., 89661-50102) to find the correct diagram.

• Pins C1–C4 — O2 sensor(s) heater control
• Pins C10–C12 — Fan control / fuel pump relay control Note: This is a template for understanding layout — do not wire based solely on this section.

High risk of frying the ECU if the wrong diagram is used (especially with 12V vs. 5V pins). toyota 89661 ecu pinout

However, the full part number—e.g., 89661-0D150, 89661-06B40, or 89661-33260—dictates exactly which car, engine, and transmission the ECU belongs to. Toyota 89661 is a prefix for hundreds of

Many 1990s models (like the 4A-FE or 1UZ-FE) use a two-plug setup : Pins C1–C4 — O2 sensor(s) heater control Pins