Toyota 4afe Ecu Pinout !!better!! May 2026
The Toyota 4A-FE Electronic Control Unit (ECU) manages engine performance by processing signals from various sensors to control fuel injection, ignition timing, and idle speed
ECU Location and Identification
- Location: Behind the passenger side kick panel (right-hand drive models) or behind the glove box (left-hand drive models).
- ECU Part Numbers (Common): 89661-1A280, 89661-1A170, 89661-12470, 89661-12600.
- Connectors: The 4A-FE ECU typically uses three main connectors: a 16-pin (plug A), a 22-pin (plug B), and a 16-pin (plug C). These are often color-coded (gray, white, or black) depending on the chassis.
Final Checklist: Using Your 4AFE ECU Pinout
Before you close this article, here is a quick diagnostic cheat sheet using the pinout: toyota 4afe ecu pinout
The ECU connects to the engine harness through multiple plugs (often denoted as 10P, 16P, 22P, and 26P). 1. Power and Grounds +B: Main power supply from the EFI relay (12V). +B1: Secondary power supply. E01/E02: Ground for fuel injectors. The Toyota 4A-FE Electronic Control Unit (ECU) manages
The ECU uses these signals to calculate engine load and conditions: Location: Behind the passenger side kick panel (right-hand
Connector Layout and Terminal Identification
Before we list the pinout, you need to understand how Toyota labels its ECU connectors. Look directly at the ECU—the plastic housing is embossed with numbers (1, 2, 3… up to 22).
 
 
