Toyota 4afe Ecu Pinout (SECURE × 2026)

This is the golden standard. We will break down connectors A (26-pin), B (16-pin), and C (12-pin).

If you own a 1996-1998 Corolla, the pinout changes to 2 round 28-pin connectors. Here are the critical differences:

You cannot use a Type 2 pinout on a Type 3 ECU. Always search specifically for "1996 4A-FE OBD-II ECU pinout."

The Toyota 4A-FE ECU uses a robust but aging engine management system. Its pinout is well-documented but varies slightly by chassis and year. When troubleshooting, always prioritize power, grounds, and the +5V reference. For swaps, the standalone-friendly nature of the 4A-FE (MAP-based, no immobilizer) makes it a popular choice—provided you correctly interface with the distributor ignition and ISC valve.

Always download a factory wiring diagram for your specific chassis (e.g., 1992 Corolla E90) before making permanent modifications. The table above is a near-universal reference for 1990-1997 4A-FE engines, but production changes did occur.

Reference: Toyota Technical Information System (TIS), 4A-FE Engine Control Manual (Pub. No. RM201E), and field testing.

Locate pin FC (B06). Grounding this wire manually turns the fuel pump on without cranking. This is perfect for draining the tank or testing fuel pressure.