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How To Reset Car Computer Without Disconnecting Battery

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Resetting The Ecm With Your Battery Connected

How to Reset Your Cars Computer, Old School Scotty Kilmer

You can do a reset of the computer with the battery still connected. To do this, you need a code reader and a fuse puller.

If you dont have access to fuse pullers, good-quality pliers will do the job.

Step 1

You need to find the fuse box for the vehicle. It will be behind a cover and it shows various fuses and their amperage.

Step 2

Remove the fuse box cover and with your pliers, pull out the ones ECU and pull out with a 15A. Next, search for the fuse Back-Up and pull this with a 7.5A.

You wont need to disconnect the terminals at all and the cars memory will stay intact that way.

Step 3

Leave the fuses disconnected for minimum 10 minutes. After the time has passed, reinstall them along with the ECU. Put the fuse box cover back in place and then do a test run.

Step 4

Take your car for a drive and see if the engine light comes on.

If the light has disappeared, the problem is solved. If you are still seeing the light come on, lower your speed.

If this doesnt work, you can try the above method with the battery plugged in. If neither works, you will need to seek advice from a professional.

Two Ways To Reset Your Cars Computer Or Ecm

These two options offer a better way for a reset because it doesnt involve messing with the car battery. This is advantageous if you dont have tools to disconnect your battery or you dont feel comfortable disconnecting the battery.

Plus, you dont lose all settings and memory like you would if you disconnect the battery.

Below Are Steps To Follow To Make The Process A Success

  • Locate the cars fuse box. There should be a cover showing the fuse and vehicle amperage information.
  • Make sure you have removed the cover.
  • Search the two fuses, one with Backup and one with ECU. Take out both.
  • Wait about 10 minutes and reinstall the two fuses.
  • Take the cover, and put it back.
  • After you have restarted your cars computer, be sure to drive the vehicle for approximately 30 minutes so that you know your driving style. Whether youre boosting performance or making your vehicle more adaptable and efficient, drive in a similar style, and your system will suit your personal driving style.
  • It should begin smoothly. There should be no issues during the trip. Check the status of your check engine light. It should be off at this point.
  • Check immediately if the problem is resolved after starting the car. Your vehicle should begin immediately without difficulty, and the check engine light should no longer be on.

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    Safety Tips To Remember When Resetting Your Cars Computer

    • Always consult your vehicles owner s manual for any special instructions for pulling fuses, etc.
    • In practice, we cannot recommend disconnecting the battery or removing it, unless you know exactly why you have to do so.
    • In some cases, you may need to disconnect your car battery, but only if your owners manual tells you to.
    • Always be aware of your vehicles wiring if you need to get under the hood. If it looks damaged, you might need to consult your local repair shop.
    • If you need to disconnect a battery terminal, use the proper tools.
    • Wrap any exposed, disconnected terminal cables after removal. Never let them touch bare metal.

    Will Touching Battery Cables Together To Reset Computer

    How To Reset Your Car Computer Without Disconnecting the ...

    Whenever you touch the battery cables together and drain the capacitors the clock will lose its memory, the radio stations will need to be reset, all fault codes will be cleared, the outside temperature may take some time to relearn, any systems with security codes will need to be reset and the computer will need to Apr 23, 2018.

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    If The Engine Check Light Returns

    Once you have your check light disappear, using any of the five above-mentioned methods, then you are ready to go. But if your check light glows again after a few days, it means there is a problem in your car that needs to get fixed.

    It is now time to get your car diagnosed for real with a scanner. Either by buying one yourself or going to a workshop that can read the codes in your car.

    How Do I Reset My Car Without Disconnecting The Battery

  • Opening the hood and disconnect the battery are the first steps.
  • 3.2 Steps 2: Locate the cars fuse box and remove the fuse after it has been damaged by lightning.
  • The third step of this process is to reinstall the battery fuse and reconnect the power cable.
  • Step 4: Upon starting the vehicle, start it and drive it through the test area.
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    Why And How To Reset Car Computer

    Todays vehicles rely on computers, or engine control modules, or units , that monitor the sensors in the engine bay to enable the vehicle to perform and function at its optimum.

    The car computer is an essential component in your car, and it is often referred to as the cars brain. It regulates several key car functions to ensure that the car is running efficiently. Some of the functions of the ECM include checking the oxygen to fuel ratio, tracking idle speed, and controlling the variable valve timing as well as the ignition timing to increase power or fuel economy. If the engine control module or its related components encounters an issue, it can cause problems to the vehicles functionality. In the worst-case scenario, this may be detrimental to your cars functionality, making it unsafe to operate.

    To avoid this risk and minimize the potential damage to your car, it is advisable to be on the lookout for the symptoms of a faulty ECM. To do this, you would need to be quite conversant with the symptoms of a failing system.

    What Is A Car Computer And What Does It Do

    How To Reboot Your Car ~ Battery VooDoo

    If theres a brain inside your car, that would be the ECM or the Engine Control Module. It works as the computer of your car by storing long-term data inside its term memory.

    The ECM controls the other modules to make your vehicle perform at its best by learning everything about your driving habit.

    The ECM performs several functions that ensure the smooth operation of your vehicle. These are:

    • Checks the oxygen to fuel ratio for which, it knows everything about the coolant temperature to the proportion of oxygen.
    • Tracks idle-speed
    • Controls the variable valve timing
    • Increases the power by controlling the ignition timing
    • Manages emissions and fuel economy of the engine
    • Gather useful data by using different sensors
    • Ensures low emissions and best mileage

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    What Is The Solution For A Failed Car Computer

    When any of these issues arise, the car computer should report an error code that determines the source of the problem. Consult your trusted mechanic to read these error codes and to eliminate other potential causes of an illuminated check engine light.

    Sometimes the check engine light may remain on even after configuring and repairing the cars issues. In case of such a scenario, you would need to reset the cars computer to erase the saved error codes.

    How Long Should Battery Be Disconnected To Reset Ecu


    Correspondingly, does disconnecting a car battery reset the ECU?

    The car ECU maps aren’t held in volatile memory, so will not be affected by removing the battery. if it did, then your cars ECUs would all reset to factory every time the battery was removed.

    Furthermore, how long does it take for a car computer to reset? How to Reset a Car Computer

  • Open up the hood.
  • Remove the positive terminal cable from the battery using your pliers or wrench.
  • Go to your fuse box in your car, and look at the diagram. Select the fuse that is labeled “ECM” and remove this fuse.
  • Keep the car disconnected like this for two to three minutes to clear the computer’s memory.
  • People also ask, do I disconnect the positive or negative to reset ECU?

    When removing cables, remove negative first, then positive. If you just want to reset the ECU, removing only negative is good enough. When installing cables, install positive first, then negative.

    When should I reset my ECU?

    ECU Reset

  • The ECU “learns” about your engine as you drive the car.
  • “Resetting the ECU” is the process of clearing all the long term memory from the ECU’s memory.
  • To “reset” the ECU, all you have to do is remove the source of backup power.
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    How To Reset Car Computer

    Learning how to reset car computer will save your car computer from several issues. You should not wait to reset a car computer if there are some issues. Resetting the ECM is not so hard, and you dont need to be car tech-savvy. And resetting a car computer is completely safe.

    By following some proper ways can be enough to reset a cars computer memory. Whether you reset or test your car computer, a little bit of knowledge about the Electronic control unit helps you a lot.

    Surprisingly, most car owners dont give sufficient attention and willpower to do it by themselves. But, if you learn the process of resetting a car computer, which will save you money and time for a lifetime and whenever you notice signs of bad ECU with resetting, you can return to work again. So, Lets know how its done.

    What Is A Car Computer

    SOLVED! How to reset car computer without disconnecting ...

    ECU is a small device referred to as the electronic control unit of a car. It is the chief computer of the vehicle. It is used to control a specific function of your car. This computer is nearly present in all the latest and modern cars these days. ECU is also known as ECM or PCM . You can find it underneath the wipers behind the trim made of plastic.

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    What Is A Car Computer And Why Would You Want To Reset It

    A car computer is an electronic control system inside of your vehicle. It controls all the important functions like ignition timing and fuel mixture to make sure everything runs smoothly. As such, its very sensitive to even small changes.

    If youve done something like put a higher octane gas in your tank than it can handle, you may have issues with your cars computer. When that happens, the best course of action is to reset your cars computer to fix any problems it may be having because of recent changes.

    You should also reset your cars computer every now and then just for good measure. We all change our cars on a regular basis- new shocks, better seats, etc. Naturally, all of the new settings youve given your car will make it run a bit differently.

    Resetting your car computer will put everything to normal again and ensure that lights arent on when they shouldnt be or any other number of issues. Its also a good idea to reset your cars computer if you have been playing around with the engine, such as adjusting your rev limiter or changing the idle speed.

    How Many Miles Does It Take For A Car Computer To Completely Reset

    Well, there is no specific measurement for this situation depending on the vehicle. The status of the battery appears on the monitor and will be ready once the car starts to run.

    Although, in average cases, the computer requires the vehicle to run around 100 miles to completely reset and get ready for next use.

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    S To Do This Are Very Easy And Can Be Done In About An Hour

  • Get some basic tools together. You will need a socket set with at least 11mm, 13mm, and 17mm sockets, as well as a ratchet for the bolts on your vehicles battery terminal connections.
  • Sit inside of the drivers seat so you can reach the steering column and disconnect the negative terminal from your cars battery
  • Remove the two bolts that hold down your steering column cover. The 17mm socket needed to remove both of these screws.
  • Pull off the plastic covering over your steering wheel by pulling outwards on each side, then move it up towards where you would rest your hands while driving
  • Now, you should be able to see the back of your steering column. Disconnect all electrical connections, then remove the four bolts that hold the lower half of this piece in place using a 13mm socket or wrench
  • Once these are removed, set aside and do not lose any screws/nuts/bolts as they are not interchangeable
  • There is a screw with a black cover over it on the top of your steering column. Remove this with an 11mm socket or wrench, and then push up on the tab thats holding down the bottom half of your steering wheel.
  • Now, ready yourself for installing new parts if you dont want to keep the old ones and insert some new ones. Be sure not to touch any of the metal on these parts as it could cause a spark when connecting them later
  • Reconnecting Your Battery Is Easy:

    Nissan Reset ECU in cabin no battery disconnect

    Just follow the steps backward for how we disconnected it since theres no need to disconnect anything else if youre doing this yourself. If someone else is helping, they may help lift the bottom half at the end while another person makes sure things are lined up right, so nothing gets bent out of shape or scratched. This how-to article should have you reset your cars computer in less than an hour so long as no other issues are found when doing this process.

    Now get out there and drive!

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    Should I Reset My Car Computer

    If not too happy with the vehicle outcomes, or taking the vehicle off-road to different terrain, you may want to consider resetting your engine control module. The process is simple and does not cause any damage to your car. Therefore, there is no need to fret over insurance covers when resetting the control modules.

    Does Touching The Battery Cables Together To Reset Computer

    Whenever you touch the battery cables together and drain the capacitors the clock will lose its memory, the radio stations will need to be reset, all fault codes will be cleared, the outside temperature may take some time to relearn, any systems with security codes will need to be reset and the computer will need to Apr 23, 2018.

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    How To Reset Car Computer Without Disconnecting Battery

    It is not difficult to reset the ECM , and you dont need to be an expert in automotive technology to do it.

    Following a few simple steps may be enough to clear your vehicles computer memory. It simply takes a few minutes and basic knowledge of your cars sensor to do it.


  • 7.1 Related posts:
  • Car Is Starting To Show Performance Issues

    SOLVED! How to reset car computer without disconnecting ...
    • The engine wont stay in a gear while driving
    • The issue may involve ECM related issues, like: Trouble with the CVT, first inboard, second inboard, or third inboard gear shift and/or transmission
    • If you observe any of the above symptoms, you should take immediate actions and take your car to the nearest authorized service center.

    The car might exhibit multiple other symptoms in addition to the above-mentioned ones. If this occurs, your cars computer or engine control module is probably failing.

    Also Read:How to Test a Fuel Pressure Sensor With a Multimeter

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    By Turning Your Car Off And On

    You guys do not require any specific tool if you follow this method by doing these easy steps.

  • Get in your car. It is totally up to you whether you close the door or not as it does not matter at all.
  • Put your key inside the socket and push the engine button to turn the car ON, but do not start it.
  • Push the gas pedal five times within five seconds immediately with the key inserted.
  • Then, wait for a few seconds while pushing the gas pedal.
  • After ten seconds, slowly release the gas pedal and see the check engine light .
  • Repeat steps 3, 4, and 5 and look at the check engine light again .
  • Turn off the car by removing the key.
  • Wait for two to three minutes for the complete alliance.
  • Now, turn the car ON again and drive it in a usual manner. It will reset the computer of your car.
  • If it doesnt work for you in the first go, try twice or thrice. It will work out. If it still does not work, contact your mechanic.

    By applying these two methods, you will not have to remove the negative and positive battery terminals. By disconnecting the battery, you will end up erasing the entire memory of your car. No doubt, it resolves the problem of resetting the car computer, but it resets all the other important information in your vehicle too that you might need later.

    These steps are tested and tried by many users, drivers, experts, and specialists. So, you can follow them to reset your car computer effectively without disconnecting the battery.

    How To Turn Off The Offending Check Engine Light

    The safest and most straightforward way to reset the Check Engine light is with the use of a code reader or code scan tool which you can buy from any store of vehicle aftermarket products.

    This method will apply only to car models manufactured starting 1996.

    When you see that irritating red or orange light comes on, heres what you should do:

    Step 1 Plug in the code scan tool or car code reader to the cars OBD-II port located under the steering column of your car. Switch on the ignition and turn off all electronic accessories.

    Step 2 Depress the Read toggle on the code reader or scan tool to see the engines trouble codes. Copy the code or codes sequentially. This can be used as a reference in the future or when there is a needed repair to be performed.

    Step 3 Depress the Erase or Clear toggle on the code reader or scan tool to clear the trouble codes. When you clear the trouble codes, the Check Engine light will automatically switch off or be reset.

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