Toyota 89661 Ecu Pinout | Portable

This article is a deep dive into the 89661 family of ECUs. We will cover what these numbers mean, why the pinout changes between models, how to identify your specific version, and provide a detailed breakdown of the most common connector configurations.

use large multi-row connectors. Detailed guides are often found on enthusiast sites like Lextreme .

Output signal to the EFI relay to provide main power. toyota 89661 ecu pinout

: The sticker on the ECU case will have the full number (e.g., 89661-XXXXX).

If you want a model-specific pinout (exact pin numbers, wire colors, and functions for a particular year/model/engine), tell me the vehicle’s year, model, and engine code (or VIN). I will produce a verified pinout table for that exact configuration. This article is a deep dive into the 89661 family of ECUs

Despite the vast differences between variants, the 89661 family retains a common electrical philosophy. The following circuits are almost always found on the same relative positions or same color wires across the series.

89661 is a part number prefix , not a specific model code. Toyota used this prefix on dozens of ECUs with different plug shapes, pin counts, and pin functions. You must confirm your exact ECU ID (e.g., 89661-12345 ) and vehicle model/year. Detailed guides are often found on enthusiast sites

EFI Relay control output. The ECU switches this on to ground the EFI relay coil, powering up the system. E1: Main chassis ground.

Wire M-REL to pin 86 of a standard automotive relay. Wire pin 85 to ground. Run fused 12V power through the relay contact switch (pin 30 to 87) out to the +B and +B1 pins.

| Generation | Years | Connectors | Typical Pin Count | Example Part Number | | :--- | :--- | :--- | :--- | :--- | | 4th Gen | 1996-2001 | 3 (B, C, D) | 26 + 24 + 22 | 89661-33260 (3.4L 5VZ) | | 5th Gen | 2002-2009 | 3 or 4 | 32 + 28 + 24 | 89661-06B40 (1.8L 1ZZ) | | 6th Gen | 2010-2016 | 4 (A, B, C, D) | 44 + 44 + 26 + 26 | 89661-0D150 (2.5L 2AR) |