Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor input.
If you are performing an engine swap, the pinout is your roadmap:
: Identify the number of plugs (e.g., 2-plug, 3-plug, or 4-plug) and the pin count per plug to match with online databases like Lextreme or ToyoDIY.
Oxygen sensor signal and oxygen sensor heater control. Step-by-Step Guide to Finding Your Specific 89661 Pinout toyota 89661 ecu pinout
The 89661 series regulates critical functions like fuel injection, ignition timing, and sensor integration for vehicles produced between the early 1990s and late 2010s. : Common units include 89661-02682 (2000 1ZZ-FE) and 89661-0Z661 : Typically uses modules like 89661-06J10 (2010 2.5L) or 89661-06G41 (2008-09 2.4L). Trucks/Tacoma : Models such as the 1989 Truck use 89661-35150 , while newer Tacomas use units like 89661-04K61 Hilux/Surf 89661-3D100 is a common unit for older Hilux Surf models. Flagship One Inc Typical Wiring and Pins 1989 Toyota Truck 2.4L - ECM ECU PCM | 89661-35150
: Power grounds for heavy actuators like fuel injectors and idle valves. Ignition and Timing Signals
Oxygen Sensor signal and Oxygen Sensor Heater controls. Actuator Outputs Manifold Absolute Pressure (MAP) sensor or Mass Air
: 4A-GE (AE92/AE101), 3S-GTE (Gen 2/3), 1UZ-FE (Early LS400), 7M-GTE. The Grey Plug Era (Mid 1990s – Early 2000s)
Identifies the component as a Toyota/Lexus Engine Control Unit.
: Diagnostic feedback communication pin (found on older OBD1 diagnostic boxes). Step-by-Step Guide to Finding Your Specific 89661 Pinout
: 34-pin / 22-pin / 16-pin / 28-pin configurations.
:
Before looking for a wiring diagram, locate the sticker on your ECU casing and note:
Pins E01/E02 (Grounds), Pins 1-4 (Battery+), M-REL.
The ECU is often mounted inside the engine bay rather than the passenger footwell. It features massive, sealed connectors with locking levers to keep moisture out. 3. Standard Toyota ECU Pin Acronyms