3s-fe Ecu Pinout Pdf (EXCLUSIVE ◆)

Turn the ignition off. Find the thickest white-red wire (BATT). It should have 12V constant. Find the thick brown or white-black wires (E01, E02). These are high-current grounds for injectors.

Unplug the coolant temp sensor. Touch one multimeter probe to the sensor connector terminal and the other probe to an ECU pin. When the buzzer sounds, you have found THW. Mark it. 3s-fe ecu pinout pdf

| 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 | | Turn the ignition off

Draw the connectors. Count the pins. Note that Toyota ECUs often have missing pins—this is normal. Find the thick brown or white-black wires (E01, E02)

Multimeter (with continuity beeper), 12V test light, a notebook, and an FSM for resistance values.

| Pin | Code | Function | Diagnostic Use | | :--- | :--- | :--- | :--- | | C1 | VTA | Throttle Position Sensor Signal | Check for smooth voltage sweep | | C2 | VC | TPS 5V Reference | Must be exactly 5.0V | | C3 | VAF | Air Flow Meter Signal (Karman Vortex) | 3S-FE uses a Karmann vortex AFM | | C5 | OX1 | Oxygen Sensor (Front) | 0.1V (Lean) to 0.9V (Rich) | | C9 | TE1 | Diagnostic Jumper (Check Engine Light) | Connect to E1 to flash codes | | C10 | E1 | Sensor Ground | Do NOT confuse with power ground (E01/E02) | If you cannot find a PDF, or you suspect your harness has been modified, you can reverse-engineer the pinout yourself. This is tedious but foolproof.