4s-fe Ecu | Pinout [patched]

A deep dive into the 4S-FE ECU pinout!

Post Title: Toyota 4S-FE ECU Pinout Reference (ST180/ST190/SX90)

5. Igniter Signals (IGT & IGF) – Pins B8, B9

+B / +B1

: Switched battery power (+12V) via the EFI main relay. BATT : Permanent +12V for memory backup. E01 / E02 : Main computer grounds. E1 : Engine ground. 4s-fe ecu pinout

4S-FE ECU pinout essential for troubleshooting or wiring engine swaps involving this 1.8-liter Toyota engine A deep dive into the 4S-FE ECU pinout

B1

| Pin | Code | Function | Wire Color | | :--- | :--- | :--- | :--- | | | #10 | Injector 1 (Cylinder 1) | Yellow | | B2 | #20 | Injector 2 (Cylinder 2) | Yellow/Black | | B3 | #30 | Injector 3 (Cylinder 3) | Yellow/Red | | B4 | #40 | Injector 4 (Cylinder 4) | Yellow/Blue | | B6 | FC | Circuit Opening Relay (Fuel Pump control) | Green/Red | | B10 | VS | Air Flow Meter (AFM) Signal | Blue/Black | | B12 | E2 | Sensor Ground | Brown | BATT : Permanent +12V for memory backup