| Pin No. | Symbol | Description | Function | | :--- | :--- | :--- | :--- | | | Crank Angle | Distributor Pickup Coil | RPM Signal | | G+ / G- | Cam Position | Distributor Pickup Coil | Cylinder ID | | THW | Temp Sensor | Engine Coolant Temp | Cold Start Enrichment | | THA | Temp Sensor | Intake Air Temp | Air Density Correction | | VG | Volume Air Flow | Vane/Flap Air Flow Meter | Air Volume Measurement | | VC | VCC | 5V Output to Sensors | Powers TPS/AFM | | IDL | Idle Switch | Throttle Position Sensor | Idle Circuit Activation | | VTA | Throttle Angle | Throttle Position Sensor | Throttle Opening % | | OXL | Oxygen Sensor | Left Bank O2 Sensor | Fuel Trim Feedback | | KNK | Knock Sensor | Engine Knock Detection | Timing Retard |
The Toyota 89661 series of Engine Control Units (ECUs) represents a massive catalog of computers used across decades of vehicles, from the legendary 1JZ/2JZ platforms to the reliable 1MZ-FE and 3RZ-FE engines. Because the part number 89661 is the prefix for almost all Toyota ECUs, identifying the correct pinout requires looking at the specific five-digit suffix (e.g., 89661-30430) and the connector shape. toyota 89661 ecu pinout