4s-fe Ecu Pinout __top__ Jun 2026

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

Note: Always check the sticker on your ECU (e.g., part numbers starting with ) to confirm the diagram, as JDM variants can differ slightly from market to market. 4s-fe ecu pinout

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