Toyota 89661 Ecu Pinout ✦

Every Toyota ECU features a 10-digit OEM part number format: .

While physical plug designs changed across generations, Toyota has maintained consistent acronyms for terminal functions for decades. When looking at a factory wiring diagram, these are the primary pins you will encounter: Power and Ground Terminals : Main switched +12V power from the EFI relay.

: Ignition Switch signal (tells the ECU the key is turned to "ON"). E1 : Main ECU chassis ground. toyota 89661 ecu pinout

Oxygen Sensor signal and Oxygen Sensor Heater control. Communication & Body Controls

2. Grey/White OBD1 & Early OBD2 Era (Mid 1990s – Early 2000s) Every Toyota ECU features a 10-digit OEM part number format:

Wire M-REL to pin 86 of a standard automotive relay. Wire pin 85 to ground. Run fused 12V power through the relay contact switch (pin 30 to 87) out to the +B and +B1 pins.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. : Ignition Switch signal (tells the ECU the

On older ECUs (pre-2003), connectors are labeled E5 , E6 , E7 . On newer ones, they are A , B , C , D .

Output signal to the EFI relay to provide main power.