Where is the ECM ECU located on a 2003 Ford F-150?
You will find the ECM on the passenger side on the inside in the far right corner going through the firewall. You will have to take the battery and battery tray out to unscrew the wire harness from the engine compartment. The ECM unit will then come out easily from inside your vehicle.
Just replaced mine. It is located under the right hand kick panel up high under the dash. It is held in place by a plastic clip and protrudes through the fire wall where the plug is located. There is a bolt through the center of the plug that you have to unscrew to take the plug off. It then comes out very easily from the inside.
The ECM on a 2003 Corolla is located directly under the center of the glove compartment. You can see the ECM if you lay on your back looking upward in the front passenger area. If you remove the one screw on the right side of the glove box (when it is open) you can lift out the glove box and will be looking down on the ECM. By the way, this is all you need…