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The Toyota series refers to a broad range of Engine Control Units (ECUs) used across decades of vehicles, from 1980s 22RE engines to modern 1GR-FE platforms. Because the part number prefix "89661" is generic, you must identify the specific suffix (e.g., 89661-52592) and the engine model to find an accurate pinout . Common 89661 ECU Pinout Examples
| | Pin | Name | Label / Function | | :--- | :--- | :--- | :--- | | Connector A | A15 | G1 | Power Ground | | | A20 | IGT | Ignition Timing Signal | | Connector B | B4 | KNK | Knock Sensor Signal | | | B6 | OX | Oxygen Sensor Signal | | | B9 | E2 | Sensor Ground | | | B11 | VTA | Throttle Position Sensor Signal | | | B12 | IDL | Idle Switch Signal | | Connector C | C1 | VC | +5 Volt Sensor Power | | | C2 | VS | Throttle Switch Signal (Full throttle / A/C cut) | | Connector D | D4 | BRS | Brake Switch Signal | | | D9 | VSS | Vehicle Speed Sensor Signal |