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ECU (Engine Control Unit)

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How Your ECU Uses Sensor Data
Today’s modern vehicles are made up of anywhere from one to seven computers that assist with the car’s day to day functions. An engine control unit (ECU), is a computer that similar to that of...
What Is a Reprogrammable ECU?
The ECU, or engine control unit, is part of your car’s computerized brain and is responsible for monitoring and managing all aspects of engine operation. For anyone who isn’t interested in upgrading their...
Industry News for Automotive Techs: October 29 - November 4
Toyota and Getaround's smartphone key, future McLaren cars, DMCA car hacking, a fire at Ford's headquarters, and Chevrolet's SEMA 2016 show cars.

Related questions

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Air conditioning light - 2001 Honda Civic
Hi there, check the A/C relay for being stuck in the "On" position. Relay contacts degrade over time and use, and can stick together when burned. The result would be the A/C light staying on, even though you press the...
Question
Hello, my car has no spark, no controlled ground for the fuel pump, and no injector pulse. Fuse link close to the battery and relays are good.
Hello and thank you for contacting YourMechanic. The ECU is under your passenger's side seat. You can gain access to it by simply sliding the seat all the way forward and removing the plastic cover from the ECU. You can...
Question
Traction control light is on, 2000 BMW
As you know, your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU....
Question
95 grand cher. eng turns over wont start, leave ign on and a few min later fuel pump kicks in but relays under hood make noise the
Hello, thank you for writing in. There are some tests that you can do to make sure that your fuel pump and fuel delivery system is working correctly. These can be time consuming and difficult to do from home without...
Question
Can a car's computer system determine if it jump started another car
Your car's computer does not have anyway of telling whether or not it has jumped another vehicle. As you may know, when jumping another car, this can cause a slight momentary drain on your car's battery as the other car...
Question
I need help with a computer and security module question
Swapping out control units from car to car is a thing of the past. Even if you have a controller from the same year make and model car. In most cases the controller is programmed with to work only with...
Question
can I use the positive and negative posts under the hood to maintain power to the computer while replacing main battery
If the two posts are indeed specified for jump starting, then the answer is "yes" you can safely install a 12 volt car battery there at the remote posts while you remove and replace the permanent car battery. Electrically, all...
Question
module or unit?
Hi there. From the description you have provided, your vehicle Check Engine Light on with lots of warnings and exterior lighting acting weird, sounds like there may be a charging system related problem. I would recommend not driving your vehicle...
Question
It won't start and the ECU is not found by scanner.
Hi there. First check the battery and make sure that there is 12.6 volts. If the battery is low, then the battery will need charged before testing again. Check the wiring from the battery to the fuse box and make...
Question
Will a bad O2 sensor damage my car's computer?
The engine control unit (ECU) is a possible cause of the O2 sensor fault codes but not the most likely. Your vehicle is equipped with 4 O2 sensors. Bank 1 is the driver's side. Bank 2 is the passenger side....
Question
Replaced ECU Integrated Transfer Case Board, how much will it cost to reprogram it?
Hey there, thanks for writing in about your 2006 Land Rover LR3. Unfortunately, this is a specialized service only available through Land Rover service centers, and not a cost estimate readily available to us here at YourMechanic. I recommend requesting...
Question
My car has crank and no start issues.
There is one thing I don't think you have listed or have checked. That would be injector pulse. You can have fuel pressure but without injector pulse from the ECU, the injectors will not open and the cylinders will not...
Question
I plan on putting a 6g74 from a Diamante
Hey there. The 6G74 is a direct drop in as long as the donor vehicle is the right one. That engine was used in a few models with some being FWD and others AWD, and there will be very subtle...
Question
ECU disconnected
Hi and thanks for contacting YourMechanic. First, remove the ground cable from the battery and let it stay off for 12 minutes. Then hook up the battery cable and retry the key. If your vehicle still gives you the same...
Question
Solving electrical problem resulting from reversed battery terminals
Reverse polarity, at the battery, in a 12 volt electrical system on a car can cause a variety of effects including damaging the alternator, diodes and the numerous microprocessors on a vehicle like those in the powertrain control module (PCM)....
Question
What is the process of diagnosing where the problem is with my power steering so that I can fix it.
Hi there. The power steering ECU could have has a jolt of been damaged due to the impact. This is why the mechanic is wanting to replace the ECU. Look around the damaged area and see if there is any...
Question
How long can it take an ECU computer to go bad?
Hello, and thank you for writing in. The vehicle likely did not suddenly develop all of these problems. Oil leaks in particular happen due to excessive engine wear. The spark plugs and their coils tend to be regular maintenance with...
Question
question
The security system warning light should not illuminate once the vehicle is started and you are driving. If the light does illuminate, that means there is a malfunction in the security system. Obviously, if this problem started immediately after you...
Question
I replaced OBD 2 ECU with used one. Does it need to be flashed? 1996 Volkswagon
Hello - if you are saying that you replaced your VW factory ECU with another vehicle-compatible VW factory ECU that has not been modified, then NO, there should be no need to "re-flash" the memory on the unit. The factory...
Question
ECU ? 2006 Mazda 6
Hello - I would first ask for the basis of that diagnosis, including the problem codes which would confirm the sellers statement. Buying a vehicle under these circumstances is a very risky transaction in my experience. While everything represented to...

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