4s-fe Ecu Pinout

Signals the angle of the throttle plate. Output Control Pins

While specific wire colors can vary between car models (e.g., a Mark II vs. a Carina), the following terminal codes are standard for Toyota ECUs of this era: Full Name / Function Switched Power +12V power from the EFI Main Relay when the ignition is ON. BATT Constant Battery Power Permanent +12V used to keep the ECU memory (DTCs) alive. E1 / E01 Main Ground The primary computer and power grounds for the ECU. E2 / E21 Sensor Ground 4s-fe ecu pinout

These are ground pins. E1 is the main chassis ground, while E2 is a dedicated ground for sensors like the TPS and Coolant Temp. Signals the angle of the throttle plate