So if you found this article by searching for "engine control unit" or any other combination of related terms, I hope this clears up the confusion. And for what it's worth, Mike Allen also managed to explain, in simple terms, why the ECU on a bunch of Camrys, Corollas and Avalons simply couldn't have failed at the rate reported by the media. Sign up for our Newsletter! Mobile Newsletter banner close.
Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Under the Hood. Engine Performance. How the Engine Control Module Works.
The ECM is basically an on-board computer in your car -- it's composed of hardware a pretty standard circuit board that's encoded with software a program that tells the car how to run. See more pictures of computer hardware. Functions of the Engine Control Module The engine control module basically controls the intersection of the engine 's necessary ingredients to make energy -- fuel, air and spark.
Engine Control Module Technology The ECM is a computer, and features many of the same parts as the computer you have at home or at work. Engine Control Module Repairs " ". It takes specialized knowledge and specific tools to repair, not replace, an ECM. Allen, Mike. March 3, March 8, The engine control module basically controls the intersection of the engine's necessary ingredients to make energy — fuel, air and spark.
What does the engine control module do? It constantly monitors a vast network of sensors around the car to ensure conditions are within normal operating range. Can an engine control module be repaired? Repairing an ECM requires disassembling the unit and performing some pretty detailed, precision-critical electronics work.
It's similar to repairing the motherboard in a desktop computer — assuming it can be repaired at all. What are the symptoms of a bad engine control module? Electrical damage, which can smell like burnt metal. If there is any corrosion from acid or moisture damage, it'll probably be easily visible.
His expertise in the automotive industry has given him the skills to write detailed technical instructional articles. Step 1 Open the engine compartment to access the battery. Step 2 Locate the ECM either in the engine compartment or under one of the front seats in the vehicle. Step 3 Disconnect the electrical supply by lifting the locking tab and pulling away from the computer.
Step 4 Unbolt the screws holding the ECM in place with a socket wrench. Step 5 Bolt the ECM in place with the socket wrench. Ensure the bolts are tight. Step 6 Plug in the electrical wires to the ECM. As a result, shifting can feel rough and clunky or can happen at inappropriate times, causing the engine to rev up or bog down.
From there, you can scan to see if your engine computers have produced any error codes. Here are a few of the most common:. Oftentimes, the cause of the problem is an affordable sensor or a faulty wire.
The only way to know for sure is to perform a thorough diagnosis. Contact us today on our website, or call our knowledgeable technicians at We specialize in replacing automotive computers and we can make the process quick and painless. I have a jeep Cherokee and somebody put the jumping cables on wrong and I saw sparks what is wrong with it. That is normal if the jumper cables were on the other car it was running energy already through them most times they will touch them to see if they are working so that usually makes sparks so no there is no problem with your car.
The injectors have been servived but still persists. We just discovered the oxygen sensor has been disconnected! Could that be the cause pls??
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