4s-fe Ecu Pinout __top__ Jun 2026

Toyota changed wire colors over the years. The chart above reflects the most common 4S-FE pinout (1988–1992). However:

Connects to the Circuit Opening Relay. When the ECU detects engine cranking (via the NE signal), it grounds the FC pin to turn on the fuel pump.

Sends a variable voltage signal indicating the exact angle of the throttle plate. 4s-fe ecu pinout

Here are the typical values for key circuits:

: Sensor ground return (ground output for sensors like TPS and Coolant). Ignition & Fuel Toyota changed wire colors over the years

If your engine cranks but won't start, or if the ECU won't communicate with an OBD scanner, check these pins first.

Ignition Trigger. The 5V pulse sent from the ECU to the igniter telling it to fire the coil. When the ECU detects engine cranking (via the

| Pin | Function (Code) | Pin | Function (Code) | | :--- | :--- | :--- | :--- | | B1 | STA (Starter Signal) | B9 | VC (5V Sensor Power) | | B2 | NSW (Neutral Start Switch) | B10 | G2 (Cam Position) | | B3 | Air Flow Meter Signal (VG) | B11 | G1 (Cam Position) | | B4 | Air Flow Meter Reference (VS) | B12 | NE (Crank Position) | | B5 | VTA (TPS Signal) | B13 | THW (Coolant Temp) | | B6 | – | B14 | THA (Intake Air Temp) | | B7 | – | B15 | Knock Sensor (KNK) | | B8 | – | B16 | IDL (Idle Switch) |