Do you have a specific 3S-FE pinout question? Leave the year and model in the comments below (or on your favorite forum), but always verify community advice against a factory PDF.
While the 3S-FE is not as performance-oriented as its big brother, the 3S-GE, it is a reliable and durable powerplant. However, age degrades wiring. Corrosion sets in, connectors crack, and sensors fail. Without a , you are essentially navigating a dark room without a flashlight. 3s-fe ecu pinout pdf
| Pin | Code | Function | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | A1 | +B | Main EFI Relay Power | Black-Red | | A2 | BATT | Constant 12V Memory | White-Red | | A3 | E1 | Power Ground | Brown | | A4 | IGT | Igniter Trigger Signal | White | | A5 | NE+ | Distributor Crank Signal | Black | | A6 | G1 | Distributor G1 Signal (Cam) | Blue-Red | | A7 | THW | Water Temp Sensor | Green-Blue | | A10 | STA | Starter Signal | Black-White | Do you have a specific 3S-FE pinout question
| Pin | Code | Function | Notes | | :--- | :--- | :--- | :--- | | B1 | #10 | Injector 1 (Cylinder 1) | Switched ground | | B2 | #20 | Injector 2 | | | B3 | #30 | Injector 3 | | | B4 | #40 | Injector 4 | | | B6 | VSV | EGR VSV (Vacuum Switching Valve) | | | B10 | FPU | Fuel Pump Control | | However, age degrades wiring