Ecu Ecm

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Ecu Ecm
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You're driving along and suddenly your Check Engine Light comes on. What does it mean? Check Engine Light, Check Engine Soon Light, Service Engine Soon Light, Engine Light, Engine Management Light, whatever you want to call it, simply means that your vehicle's computer system has detected a problem.

Depending on the year, make, and model, it may be related to the engine, the transmission, even the brakes and suspension. There are literally hundreds of reasons a Check Engine Light may appear. The following questions and answers discussion will clarify the truth about Check Engine Lights.

Service Engine Soon Light FAQ:

Can the car be driven? The general rule is: if the Service Engine Soon Light is on, and the car seems to be running ok, you can drive it. However, you should have it checked at your earliest convenience.

If your vehicle is running poorly--bucking, stalling, hesitating, or you just don't feel safe, tow it. When in doubt always tow it!

The check engine light went out by itself. Is it ok now? Probably not. Check Engine Lights often come and go. Even if the light is out, your vehicle's computer system will retain information that will allow the problem to be diagnosed. To avoid potential long term issues, get it checked out.

My check engine light stays on. What should I do?

If your check engine light stays on constantly, follow the instructions above, under "Can the car be driven?" Don't panic.

Can I disconnect the battery, or pull a fuse to reset the service engine soon light? Maybe, but I wouldn't. Removing the battery cable or an ECM or PCM fuse may clear the code, but it is not universally recommended in the industry. Most manufacturers advise against it. See the Best Way to Reset Check Engine Light Codes below.

What is the Check Engine Light?

The Check Engine Light is a warning light for multiple systems operating in your vehicle. In simplest terms, it's like an engine management warning light to alert you of a problem. Just like your computer pops up with an "error message window" saying that something's wrong, your service engine soon light pops up to warn you that it has detected a malfunction: mechanical, technical, software, or otherwise.

How to Reset Check Engine Light?

This is a great question! I get it all the time. See the guide below.

Resetting Check Engine Light:

First, if your Check Engine Light is on, it's on for a reason. The Check Engine Light indicates that your vehicle's on-board computers have stored a fault code. There are hundreds of fault codes, any one or more could be stored in the computers memory.

Fault codes contain critical data for accurate diagnoses of the problem.

Sometimes the fault code points directly to a faulty component, allowing for a quick diagnoses and repair. Other times, the code may only indicate a problem circuit and thus extensive diagnostic procedures may be required.

By resetting the Service Engine Soon Light, it erases important fault code data that turned the check engine light on in the first place. Without this critical information, the root problem can not be discerned.

Unfortunately, there is no universally accepted way to safely turn off a check engine light. Even if there was, if the root problem is not addressed, it will come back on.

So whether it's a Chevrolet Service Engine Soon Light, Camry Check Engine Light, Mighty Max Check Engine Light, or a 1993 Thunderbird Check Engine Light, they require individual procedures to diagnose, repair, and reset the check engine light code.

Following is a Safe and FREE way for resetting check engine light codes.

Best Way to Reset Check Engine Light Codes:

If you're not interested in diagnosing your truck, SUV or car Check Engine Light, or it's already fixed, and you just want the engine light out, visit any local repair shop. Most shops will have a universal Check Engine Light Code Reader that can quickly and safely reset, and check engine light trouble codes. It should take about 30 seconds.

Note: European models are better off with a specialist, and some older vehicles may require more time.

Here's what to do:

Politely ask your local service center (ask a technician if you see one) if they could reset the check engine light with their Check Engine Light Code Reader. They may protest, arguing that the problem must first be diagnosed.

Tell the service representative that you understand fully, and that you appreciate his professionalism. But that you would just like to try resetting the Service Engine Soon Light, and if it comes on again, you'll come back for a full diagnosis.

Be genuine. Service representatives respond positively to sincerity. If the service center wants to charge you just to reset your Service Engine Light, try another facility.

Alternatively, some parts suppliers such as Napa or AutoZone, will reset your check engine light at no charge. Just be wary of cheap parts and bad advice.

IMPORTANT, check engine light repairs can be quite costly given their technical nature. Service centers can easily hide behind complex technical language to inflate the difficulty of your Check Engine Light concern.

-Theodore P. Olson (Ted)
Resetting Check Engine Light

Ted holds extensive certifications from Mercedes-Benz, Toyota, GM, and ASE. Over a twenty-year period in the automotive service industry, he has served as a technician, shop foreman, shop manager, shop owner, service advisor, service manager, and service industry consultant. Ted is the author of eight books and numerous articles on the car repair industry.

Other Works by Ted Olson Include:

• ARREST the Automotive Service Industry!
• Maintenance Myths: A Step-by-Step Guide to STOP Getting Ripped Off!
• Auto Repair: The Shocking Truth About Who's Ripping You Off and Why!
• Automotive Service Pricing Strategies—a fair pricing guide for service centers
• Being the Best—a comprehensive customer service handbook for service advisors
• Service Center Personnel—an auto repair informational for general service staff
• Service Mission Statement—a philosophical proposal to improve customer service

How the automotive engine works

The Engine

Technically speaking, your car's engine is not a motor, although everyone uses the two words interchangeably. A "motor"converts electrical  energy into mechanical work such as the ecm and starter motor that cranks your engine. An "engine," on the other hand, is a machine that converts heat energy into mechanical work. Your engine ecm does this by forcing the engine to burn gasoline inside its combustion chambers. When gasoline and air are mixed together in the right proportions (parts of air to one part gasoline is considered ideal) and ignited by a spark, the mixture explodes, creating tremendous heat and pressure. Although, combustion occurs in a split second, the ecm insures it does so in a controlled manner. When the spark ignites the mixture, a "flame front" sweeps out from the point of ignition like a rapidly expanding balloon until all the fuel mixture is consumed. This causes a sharp rise in cylinder pressure, and ecm performance  which pushes the piston down and turns the crankshaft. Thus, heat energy is transformed into useful mechanical work to power your car down the road. Pressing down on the accelerator pedal opens up the engine throttle, which allows more air and fuel to be drawn into the engine. This increases the density of the fuel mixture in each of the engine's cylinders, which in turn increases the intensity of cylinder pressures when the mixture is ignited. As a result, the engine ecm develops more power, allowing it to either run faster or work harder, depending on the load. Let off on the accelerator pedal and the amount of air and fuel are decreased. Cylinder pressures drops and the engine ecm slows down.

In a way, you can think of an internal combustion engine as an air pump. The ecm sends signals to the throttle which allows it to pump more air through itself, and the greater the volume of air (and fuel, the greater the ecm output. That's why bigger engines require a high performance ecm to produce more horsepower than smaller ones. They have a greater pumping capacity. Unfortunately, internal combustion engines are not very efficient when it comes to making good use of the heat energy produced by combustion. Only about a third of the heat energy is actually used to drive the vehicle. Nearly a third is lost when the hot exhaust gases exit
out the tailpipe. By the time the piston reaches the lower limit of its travel. cylinder
pressure has dropped considerably from its peak which occurred shortly after ignition.
The engine ecm has gotten all it can from the expanding combustion gases, yet heat energy remains which must now be dumped out the exhaust so the cylinder can repeat the process over again with a fresh charge of air and fuel Another 20 to 25 percent of the heat produced during combustion is lost to the cooling system.

As the engine burns fuel. It begins to heat up. Were it not for the cooling system,
the engine ecm would continue to build up heat until it eventually melted and destroyed  the ecm. So heat loss through this path is unavoidable. Another form of loss is overcoming internal friction: piston rings rubbing against the cylinders',
cam lobes rubbing against their lifters; valves sliding up and down in their valve
guides; the crankshaft turning in its bearings; etc. Yet frictional losses aren't as great as you might imagine. It's only about 5 to 8 percent for most engines. Even so, it's another loss that comes out of the useful work produced by combustion.
A percentage of the engine's remaining power is also required to drive "parasitic" accessories such as the water pump, alternator, power steering pump, ecm and air conditioning compressor. There are also frictional losses in the engine ecm, transmission, drivetrain, and tires.

About the Author

Jeffery Mckee is a Freelance web designer who publishes articles for Nuvision Graphics.

What is the difference between an ECM and ECU?

Im having a problem with my 2005 Subaru Legacy GT, The cooling fan stays on all the time, even when I first start the car. This morning was in the low 50's and the fan kicked in straight away. I was reading online that this problem may be caused by the ECU. About a year and a half ago I had the ECM replaced. SO Im wondering if ECU and ECM are the same thing. Id like to get this covered by warranty. My car has 62k. Miles. Thanks for the help.

they are one in the same. It sounds like you may have a fan relay switch stuck...check this first...it should be in a box located under the hood on the drives side...it will be marked relays and/or fuses.

Hope this helps.

2001 Toyota RAV4 AWD from North America - Comments
What things have gone wrong with the car? 170,000 km - Had ECU (computer) sent away for fixing ($500 US). Other than that, normal stuff, replaced battery, oil changes, etc.

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