Toyota 4afe Ecu Pinout __hot__ Jun 2026

: Switched battery power (12V) provided via the EFI main relay. : Continuous battery power for memory. : Power grounds for the injector circuits. : Engine ground.

Oxygen sensor signal (single wire on many early 4A-FE models). Engine Outputs: #10, #20: Fuel injector triggers. IGT: Ignition trigger signal to the igniter. IGF: Ignition confirmation signal back to the ECU. ISC / RSC: Idle Speed Control valve signals. Wiring Connection Details toyota 4afe ecu pinout

Is this for or performing an engine swap/standalone install ? Share public link : Switched battery power (12V) provided via the

Check Engine Light (CEL) trigger. Grounding this pin via a bulb illuminates the dash light. Troubleshooting Common Issues No Start Condition : Engine ground

Pins A01 and A02 provide 12V. If your fuel pump doesn’t prime, check these wires first. Pins A15 and A16 are critical grounds—never assume chassis ground is enough.

Let’s put this to work with real diagnostic scenarios.

For a full wiring diagram or printable reference ("paper"), you can access these detailed technical guides: