“If someone is going away for a few months over the winter, they should definitely disconnect the battery. It’s the only way to prevent battery drain,” Rashidi said. I would recommend taking the negative battery post out, and wrapping something around the end so it doesn’t touch anything while you’re not there.”

The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode. Electrons repel each other and try to go to a place with fewer electrons.

Positive and Negative terminals The electrode from which the electrons emerge is the negative terminal. It is also called the cathode. The electrode that receives electrons is the positive terminal. It is called the anode.

The terminal of a battery or other voltage source that has more electrons than normal; electrons flow from the negative terminal through the external circuit to the positive terminal.

Negative pole first: Whole car (except a few parts like the positive pole) are connected. Any mistake with the other lead will lead to a short. If you mess up by touching the car with the other lead nothing will happen.

NHRA rules mandate that a battery-disconnect switch be installed on the positive side of the battery.

Does Disconnecting Battery Reset Check Engine Light? Yes, disconnecting the engine is one method of resetting your check engine light. Other experts recommend turning on the light switch for a few minutes (the lights won’t come on) after disconnecting the engine to drain any remaining current on the computer.

To prevent this, you may be instructed to disconnect the battery cables and touch them together. Connecting the positive and negative battery cables together for approximately 5 minutes will drain all of the capacitors in the computers and forces them to cold reboot.

If you directly touch the negative and positive terminals of the same cell? A short circuit. Your cell will begin to discharge rapidly as electrons flow from the anode to cathode with little resistance. the + and – will create a massive spark.

Just so, 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.

Leaving the battery disconnected for about 15 minutes will ensure the vehicle systems will completely reset when you reconnect the battery. Disconnecting the battery will clear the error codes and reset the check engine light.

And removing your battery cables for safety precaution’s doesn’t remove the tune . It will reset everything as far as your air/fuel ratio so when you start it up again and let it do the idle adjustment . Then take it out for a normal drive so the Ecu can relearn your driving habits again.

It could take as little as 30 minutes if you drive exactly in a specified way. Other times it may take a week or so. In the end, it does matter though because the engine control module is constantly learning and making sure your car is running optimally.

One way to reset computer is by disconnecting your battery cable for 2 to 3 minutes and then waiting to check if the check engine light comes back on as you reconnect the battery then starting the car.

Your vehicle’s check engine light will will reset by itself once the issue or problem has been repaired; this is true for most models. But the issue may be a bit more involved than simply resetting it. The issue may stem from your car having to run several cycles.

Yes they can make the light go out temporarily. They do it by using a scanner to erase the readiness monitors. Then until the readiness monitors reset (might be days, weeks or months) the light will stay off. That is, unless there is a hard failure then the light will come back when the car is restarted.

A. How to Disable the “Check Engine” Light Permanently

1. Drive car and allow the Check engine light go off. On how to disable the check engine light permanently, the first technique is driving and time.
2. Turn the automobile on and off thrice.
3. Separate and reconnect battery.
4. Use an OBD Code Reader.

Did you know that you can get your check engine light scanned for free? Any of the major parts stores in the country, such as: Napa, Advance Auto, Autozone and O’Reilly’s, will scan your vehicle, and tell you the P codes for no charge at all.

By the way the easiest way to turn off the check engine light would be to disconnect the battery for 30 seconds. Inorder to pass inspection your car needs to complete a full drive cycle so that all (8) internal monitors have a status of “Ready”.

To make sure the check engine light does not reappear, it’s recommended that you drive your car 30 to 100 miles. This enables the vehicle’s “Drive Cycle” to reset, as the various sensors need time to recalibrate.

How Long does it Take to Complete a Drive Cycle. Preparation for it will take eight hours but, all in all, a basic drive cycle test should take around 30 minutes to complete, with about 20 minutes of actual driving. Understanding your vehicle’s overall health can help you ensure it drives smooth and lasts long.

A drive cycle is one of the methods used by a vehicle’s powertrain control module (PCM) to determine whether an emissions system repair was performed successfully. It involves a special test drive that duplicates the scenario of a person starting the car and making a short freeway trip, as if driving to work.

Answer: Your vehicle may pass the smog inspection with an incomplete EVAP monitor. It will be the only monitor allowed to be incomplete on a 2000 & newer gasoline powered vehicle.

15 minutes of steady driving on an expressway/highway followed by 20 minutes of stop-and-go driving with at least four 30-second idle periods. Allow the vehicle to sit for at least eight hours without starting the engine. Then, start the engine and complete the above driving cycle.

4-7 days