Al, I am not sure about foreign cars, but for most US cars, you should connect the battery and then turn the key but not start for about 10 to 15 seconds. Then, once all sensors reset, start the car and just let it sit and idle for 15 to 20 minutes without touching anything. Then all should be fine.Click to see full answer. Also, why is my engine stalling after replacing the battery?But by disconnecting your battery when you replace it with a new one, you cut the flow of power to your vehicle’s computers, if only for a short time. If the power is disconnected for too long, these computers can lose their VRAM settings, including the engine idle settings.Subsequently, question is, how do you reset your car’s computer? 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. One may also ask, how do you reset Kia after battery disconnected? How to Reset KIA After Battery Is Disconnected Open the hood and locate the “Diagnostics” connector behind your Kia’s battery. Connect the other end of the jumper wire to the positive terminal on the battery. Enter your Kia and place the key in the ignition, turning it as far as it will go without starting the engine. Does disconnecting battery reset ECU?These trim values are stored in volatile memory, so removing the vehicle battery for a short while will reset them. 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.
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