Toyota 89661 Ecu Pinout May 2026
| Pin No. | Symbol | Description | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | E1 | Ground | ECU Case/Signal Ground | Brown/White | | E2 | Ground | Sensor Ground | Brown | | E01 | Power Ground | Injector/Actuator Ground | Brown | | E02 | Power Ground | Injector/Actuator Ground | Brown | | BATT | Battery Power | Constant 12V (Keep Alive Memory) | Black/Red | | +B | Main Relay | Switched 12V Power (Main) | Black/Orange | | +B1 | Main Relay | Switched 12V Power (Backup) | Black/Orange |
Below is a concise, general overview for the Toyota 89661 ECU connector family (commonly used in many Toyota models for engine/ECM and immobilizer-related connections). Connector pinouts can vary by model year, engine type, and region—use this only as a starting reference and verify against the vehicle’s factory service manual or wiring diagrams for the specific VIN.
Most Toyota 89661 ECUs utilize a standardized physical form factor: four rectangular connectors. Toyota refers to these as Connector A, Connector B, Connector C, and Connector D (sometimes E on older units). However, not all ECUs use all four; a basic Corolla ECU might only use A, B, and C, while a Land Cruiser ECU will use all four. toyota 89661 ecu pinout
First, a critical lesson for anyone searching for a "toyota 89661 ecu pinout": You cannot use a pinout from a 1998 Camry on a 2007 Land Cruiser simply because both ECUs start with 89661.
Toyota’s part numbering system breaks down as follows: | Pin No
Almost all 89661 ECUs from the late 1990s to the 2010s use three or four large rectangular connectors. On the ECU case, these are typically labeled:
A full Toyota ECU part number looks like:
89661-XXXXX (e.g., 89661-06A90, 89661-33240, 89661-52N10) Verify – Compare at least 3 sources
⚠️ Never assume pinout from the prefix alone. Always use the full 10-digit number on the ECU label.
Most 89661 ECUs use three 22-pin connectors (A, B, C) or four connectors (A, B, C, D). The pins are numbered embossed on the plug housing.
| Connector | Typical Color | Common Circuits | |-----------|---------------|------------------| | A (22-pin) | Gray or White | Injectors, ignition coils, power, grounds | | B (22-pin) | Gray | Sensors (TPS, MAP/MAF, ECT, IAT, CKP, CMP) | | C (16-22 pin) | Black or Blue | Solenoids (VVT, EGR, purge), fuel pump relay, CEL | | D (if present) | Black | Immobilizer, diagnostics (K-Line, CAN low/high) |