: If you are swapping an older Toyota engine to standalone management or an aftermarket igniter, ensure the ECU receives an IGF signal loop. Without it, the engine will start for 2 seconds and immediately stall out.
This ECU often utilizes two primary connectors for bench flashing or diagnostics. 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
Power grounds specifically dedicated to high-current driver circuits inside the ECU (like fuel injectors). 2. Ignition Control Pins (IG Systems) : If you are swapping an older Toyota
The pinout data provided in applies to the most widely circulated variant (22R-E engines). For other variants, use the nomenclature guide in Section 4 combined with a vehicle-specific wiring diagram to safely test the pins. If the vehicle exhibits no-spark or no-injector pulse conditions, inspect the ECU internal capacitors, as this is the primary failure mode for the "89661" generation of Toyota electronics. Pin 1: +12V Battery (BATT) Pin 2: +12V