Toyota 89661 Ecu Pinout May 2026

Toyota 89661 ECU pinout — overview & key pin functions

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.

Sensors: THW (Water Temp), THA (Air Temp), PIM/VC (MAP/Reference Voltage) . Fueling: #10, #20 (Injector pulses) . Modern CAN-Bus Configurations (2005+) toyota 89661 ecu pinout

This ECU often utilizes two primary connectors for bench flashing or diagnostics. E7 Connector (Main Power & CAN): Pin 1: +12V Battery (BATT) Pin 2: +12V Ignition (IGN) Pin 12 & 25: Ground (GND) Pin 16: CAN-High (CAN-H) Pin 17: CAN-Low (CAN-L) E6 Connector: Pin 7: K-Line (Optional diagnostics) 2. Modern Toyota/Lexus (1GR-FE, 1UR-FE, 3UR-FE) Toyota 89661 ECU pinout — overview & key

1. How to Identify Your Exact ECU

Look for the full 10-12 digit number on the ECU case label: Fueling: #10, #20 (Injector pulses)

Connector Layout (Typical E5 / A / B Connector)

Note: Pin numbers are often stamped into the plastic behind the connector.

Part 1: Decoding the "89661" - Why the Suffix Matters

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.