Outputs to control auxiliary air bypass to maintain stable idle under varying electrical or A/C loads. 3. Generic 26pin-16pin-22pin 3S-FE Pinout Reference
Toyota updated the 3S-FE engine management system several times throughout its production run. Because of these updates, a single "universal" pinout diagram does not exist. You must identify your engine's generation before splicing any wires. Early Generation (Late 1980s – Early 1990s) Camry (V20), Celica (T160/T180).
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
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Traditional distributor with an external igniter and coil. Outputs to control auxiliary air bypass to maintain
Signal from the Coolant Temperature Sensor. THA (Air Temp): Signal from the Intake Air Temp sensor. OX / OX1: Oxygen sensor signal for closed-loop fueling. 4. Output Controls
Idle Speed Control valve pins. These regulate bypass airflow to steady the engine idle under changing loads, such as turning on the air conditioning. Because of these updates, a single "universal" pinout
Signals generated by the pickup coils inside the distributor (or crank/cam sensors on later models). They inform the ECU of engine RPM and exact crankshaft position.