4s-fe Ecu Pinout Jun 2026

4S-FE wiring diagram, Toyota 4S-FE distributor pinout, 4S-FE injector resistance check, 4S-FE ECU location, 4S-FE to stand-alone wiring.

| Pin | Wire Color | Function | Signal Type | Voltage/Note | | :--- | :--- | :--- | :--- | :--- | | B1 | Gray | Throttle Position Sensor (VTA) | 0.3 – 4.8V | Closed = 0.3V / WOT = 4.8V | | B2 | Green | TPS Reference Voltage (VC) | 5V ± 0.1V | Supplied by ECU | | B3 | Brown | TPS Ground (E2) | 0V | Sensor ground | | B4 | Red-Yellow | Intake Air Temp (THA) | 0.5 – 3.5V | Cold = high voltage | | B5 | Blue-Black | Engine Coolant Temp (THW) | 0.2 – 3.5V | Hot engine = ~0.5V | | B6 | (Empty) | N/A | N/A | N/A | | B7 | Black-Blue | MAP / VAF Sensor (PIM) | 1.5 – 4.5V | Idle = 1.5V / WOT = 4.0V | | B8 | Green-Red | MAP/VAF 5V (VCC) | 5V | Sensor power | | B9 | White-Black | MAP/VAF Ground (E2) | 0V | Sensor ground | | B10 | Black-Red | Idle Air Control Valve (RSC) | +12V | IACV coil #1 | | B11 | Black-Yellow | Idle Air Control Valve (RSO) | +12V | IACV coil #2 | | B12 | (Empty) | N/A | N/A | N/A | 4s-fe ecu pinout

Most 4S-FE ECUs use two main rectangular connectors: 4S-FE wiring diagram, Toyota 4S-FE distributor pinout, 4S-FE

The "Spark"—IGT tells the coil to fire; IGF tells the ECU the spark actually happened. Fuel Injector Pulses VCC, IDL, VTA 5V reference, Idle switch, and

Pressure Intake Manifold (MAP), Water Temp, and Intake Air Temp. VCC, IDL, VTA 5V reference, Idle switch, and Throttle angle signal. Diagnostic TE1, TE2, VF Diagnostic trigger pins and output signals. Visual References Critical Troubleshooting Tips

Always verify your specific plug shape. Toyota switched between "square" and "round" terminal styles in the early '90s. If your wire colors don't match standard 3S diagrams, focus on the pin position rather than the insulation color!