| Pin | Typical Signal | Notes | |-----|----------------|-------| | A1 | IGT1 (Ignition timing signal 1) | To igniter | | A2 | IGT2 | | | A3 | IGT3 (if V6) | | | A4 | IGT4 (if V6) | | | A5 | IGF (Ignition confirmation) | From igniter | | A6 | NE+ (Crankshaft position sensor +) | Variable reluctance | | A7 | NE- (Crankshaft position sensor -) | | | A8 | G2+ (Camshaft position sensor) | | | A9 | G2- | | | A10 | THW (Engine coolant temp) | Analog input | | A11 | THA (Intake air temp) | Analog input | | A12 | VTA1 (Throttle position sensor) | Analog 0-5V | | A13 | VTA2 (TPS sub) | Redundant signal | | A14 | E2 (Sensor ground) | Common ground | | A15 | VC (Vref – 5V output) | To TPS, MAP, etc. | | A16 | KNK1 (Knock sensor 1) | | | A17 | KNK2 (Knock sensor 2) | V6 only | | A18 | OX1 (Front O2 sensor) | 0-1V or wideband | | A19 | OX2 (Rear O2 sensor) | | | A20 | STA (Starter signal input) | From ignition switch | | A21 | NSW (Neutral start switch) | Park/Neutral position | | A22 | SPD (Vehicle speed signal) | From speed sensor or ABS | | A23 | AC1 (A/C request) | | | A24 | ACMG (A/C magnetic clutch relay) | Output | | A25 | ELS (Electrical load signal) | Alternator load | | A26 | BATT (Battery backup) | Constant +12V for memory |
: Sensor signal ground return paths (isolated from chassis noise).
Toyota ECUs generally fall into three design eras. Identifying your era helps narrow down the correct pinout map. The Yellow-Plug Era (Late 1980s – Late 1990s) : 4A-GE, 3S-GTE, 1UZ-FE (early), 1JZ-GTE. toyota 89661 ecu pinout
prefix is a generic part name code for Toyota Engine Control Units (ECUs). Because this prefix covers hundreds of different car models and engines produced since the 1980s, you must have the full 10-digit part number (e.g., 89661-12250) to find an accurate pinout. Toymods Car Club Common 89661 Pinout Examples
Remove the four corner screws on the metal casing. | Pin | Typical Signal | Notes |
End your research here if you already have your exact 10-digit number. If you are troubleshooting a specific swap project, I can help you narrow down the exact diagram. Please let me know:
When reading a Toyota 89661 schematic, you will encounter standardized abbreviations. Here is a master translation list for the most critical pins: Power and Ground Identifying your era helps narrow down the correct
: High-density gray or white connectors. Plugs often clip into a plastic guide frame before entering the ECU. The Dual Heavy-Duty Locking Era (Late 2000s – Present) Common Engines : 2GR-FE, 1UR-FE, 2ZR-FE, 1GR-FE.