4s-fe Ecu Pinout High Quality Instant

Water Temperature Sensor signal. Resistance drops as the engine warms up, altering voltage input. THA: Intake Air Temperature sensor signal. OX / OX1: Oxygen sensor signal ( swing) used for closed-loop fuel trimming. Distributor / Position Signals

These inputs allow the ECU to calculate load, fueling, and timing advance. Function Description Signal Range Intake Manifold Pressure (MAP Sensor) 0.5V - 4.5V THW Engine Coolant Temperature (ECT) 0.5V (Hot) - 4.5V (Cold) THA Intake Air Temperature (IAT) 0.5V (Hot) - 4.5V (Cold) VTA Throttle Position Sensor (TPS) signal 0.5V (Idle) - 4.5V (WOT) IDL Idle Switch contact point inside TPS 0V (Idle) / 12V (Off-Idle) OX Oxygen Sensor voltage signal 0.1V (Lean) - 0.9V (Rich) KNK Knock Sensor signal AC Frequency Actuators and Auxiliary Outputs 4s-fe ecu pinout

Signal from the Throttle Position Sensor (TPS). Water Temperature Sensor signal

Grounding signals to fire the fuel injectors. OX / OX1: Oxygen sensor signal ( swing)

| Pin | Code | Function | Wire Color (Typical) | | :--- | :--- | :--- | :--- | | | +B | Main EFI Relay (Power) | Yellow/Red | | A2 | E1 | ECU Ground (Power return) | Brown | | A9 | STA | Starter Signal (to tell ECU you’re cranking) | Black/White | | A10 | VTA | Throttle Position Sensor (TPS) Signal | Light Green | | A11 | VC | 5V Sensor Power (for TPS & AFM) | Yellow/Blue | | A14 | THW | Coolant Temp Sensor Signal | Brown/Yellow | | A18 | IGF | Ignition Feedback (from Igniter to ECU) | White | | A20 | IGT | Ignition Timing Signal (ECU to Igniter) | Red/White | | A21 | NE+ | Distributor Crank Position Signal (+) | White | | A22 | NE- | Distributor Crank Position Signal (-) | Black |

Throttle Position Sensor (TPS) signal pin. It outputs a voltage proportional to how far the throttle pedal is depressed.