The most frequently requested pinout for the "89661" prefix belongs to the equipped with the 2.4L 22R-E engine . This unit typically utilizes three rows of pins arranged in a "D" shape or straight configuration depending on the year.
Understanding the pinout allows you to bypass the ECU entirely for quick diagnostics.
Ground failures cause 90% of intermittent 89661 failures.
Focus on the (1GR, 2UZ, 1ZZ) instead of just the ECU number.