Toyota 89661 Ecu Pinout ((full)) Page

Introduced alongside VVTi technology and OBD2 compliance. These plugs have smaller pins, latches integrated into the bracketry, and complex split routing where half the plugs belong to the engine harness and the other half belong to the vehicle's dash/fuse box loom. How to Safe-Wire an 89661 ECU for a Standalone Engine Swap

Most factory manuals show the ECU Header (the pins on the computer itself). If you are looking at the Wiring Harness Plug , the image will be a mirror image.

Looking directly into the open face of the plastic plug attached to the wires. toyota 89661 ecu pinout

| Pin | Function | |-----|-----------| | A10 | Camshaft Position Sensor | | B12 | Ignition Coil 1 | | C9 | Alternator L terminal |

While there isn't a single "official" review for a generic (as "89661" is a prefix used for hundreds of different Engine Control Units), technical feedback from automotive forums and technician platforms like JustAnswer consistently highlights its utility for DIY repairs and engine swaps. Overview of the Toyota 89661 Series Introduced alongside VVTi technology and OBD2 compliance

: A 5V reference output sent to power sensors like the Throttle Position Sensor (TPS). IGT (1, 2, 3...)

+B (Main Power), BATT (Constant), E1/E01/E02 (Grounds) . If you are looking at the Wiring Harness

: Constant 12V from the battery (keeps ECU memory alive). E1 / E2 : Main chassis and sensor grounds. E01 / E02 : High-current grounds for injectors and coils. Ignition & Fuel:

Almost all 89661 ECUs from the late 1990s to the 2010s use three or four large rectangular connectors. On the ECU case, these are typically labeled: