While specific diagrams vary, many Toyota 89661 series ECUs share standardized pin abbreviations and basic power configurations:
Oxygen Sensor signal and Oxygen Sensor Heater controls. Actuator Outputs
3. The Sealed Engine-Bay Plastic Blocks (Mid 2000s – Present) 2GR-FE, 1NZ-FE, 3UR-FE.
: Wire BATT directly to the positive terminal of the 12V supply. toyota 89661 ecu pinout
Set your multimeter to Continuity Mode. Touch one probe to the ECU metal casing and check the pins designated as E1, E01, and E02. They should show continuity to the case or the vehicle chassis.
Engine speed sensor (Crankshaft position sensor).
A well-known issue with the 89661 series (especially the -50102 from the While specific diagrams vary, many Toyota 89661 series
Most Toyota ECUs of the 89661 series use :
The legendary MR2 Turbo ECU 89661-17320 (SW20 chassis) is a common platform for enthusiasts. Here is a simplified but direct pinout listing for the 3S-GTE ECU.
Before attempting to use a pinout, the specific unit must be identified. A part number starting with 89661 is always an ECU, but the suffix dictates the vehicle and wiring. : Wire BATT directly to the positive terminal
Warning: Never assume two ECUs share the same pinout just because they both start with 89661. Always match the complete part number to your wiring diagram. Anatomy of a Toyota ECU: Connector Eras
Camshaft position sensor signals used for sequential injection timing.
Jumper E1 , E01 , and E02 together and attach them to the negative terminal of a 12V power supply.
Permanent 12V battery power (keeps ECU memory/fault codes alive). IGSW: Ignition switch signal that tells the ECU to wake up.