Disconnecting a car battery to reset computer 64,battery acid games highway rider 1.7.2,batteries in parallel equation,gp rechargeable batteries nimh - Easy Way

13.10.2014
Disconnecting or replacing a battery on a computer-equipped vehicle may cause starting, driveability and a number of other problems, including loss of air conditioning, power accessory functions (door windows, seats, sunroof), false warning lights, even damage to certain electronic modules!
One of the things I wanted to do with the article was list all of the vehicle applications that have known battery disconnect issues. On vehicles with known battery disconnect issues, there should be a big red warning label on or near the battery to warn people. Warning: Disconnecting the battery to reset the PCM on a growing number of late model (2003 and newer) vehicles can do more than erase the Keep Alive memory. Also Note: Disconnecting the battery will NOT allow a vehicle to pass an OBD II plug-in emissions test.
Erasing the PCM's adaptive memory may also affect the way the transmission shifts and feels. It resets the FMEM (Failure Mode Effects Management) module on certain late model Ford vehicles.
It resets the ABS (Antilock Brake System) and SIR (Supplemental Inflation Restraint) or airbag modules. Chevy Tahoe Loss of voltage to the vehicle electrical system causes the 4WD module to go to sleep permanently. Toyota (various models) If the battery is disconnected while the key is on, it can set a fault code for the airbag system and turn on the airbag warning light (which deactivates the airbag system until the fault is cleared with a scan tool). Subaru (various models) Disconnecting the battery can trigger the anti-theft system, preventing the vehicle from starting when the battery is reconnected. Honda (various models) Disconnecting the battery will set a code and turn on the air bag light (which also disables the airbag system). WARNING: Regardless of the year, make or model of vehicle NEVER disconnect the battery while the engine is running or the ignition key is on. If a battery has to be disconnected prior to doing electrical work on a vehicle (which is highly recommended to prevent an accidental short that might damage wiring or modules), or if an old or weak battery is being replaced, voltage MUST be maintained to the PCM and other modules while the battery is disconnected. Voltage to the PCM and other modules can be provided by connecting a 12v backup power supply to the battery cables, using jumpers to attach another 12v battery to the battery cables, or plugging a small 9 volt battery Keep Alive Memory (KAM) saver into the cigarette lighter or a 12v power receptacle. The Schumacher OBD Memory Saver Cable is another handy device for preserving learned data, stored codes and programmed electronic settings such as clocks, radios, seat positions, keyless entry systems, alarms and more. The Keep Alive Memory chips in most modules require very little current to retain their settings, anywhere from a few milliamps up to 10 to 15 milliamps depending on the module. Many modules have internal timers that either turn off the module to put it into a "sleep mode," or power down the module to a "standby mode" to reduce the parasitic power drain after a predetermined length of time when the key is turned off or the vehicle's occupants leave the car.


As a rule, the parasitic drain on most late model vehicles should be less than 50 milliamps one hour after the vehicle has been shut off and left undisturbed. Keep in mind, though, that opening a door, the trunk or turning anything on can wake up various modules and start the timer countdown all over again. If replacing a battery (new or used), make sure the battery is FULLY CHARGED before installing it. Connect the POSITIVE (+) battery cable first (which may be color coded RED), then the NEGATIVE (-) GROUND cable last (which may be color coded BLACK). This article applies to the Ford F-150 (2004-2014) and F-250, F-350 Super Duty (2005-2014). Your car will not take you anywhere without the battery, so knowing how to replace your battery will help get you back on the road quicker and cheaper. Don’t touch any wrenches between the battery terminal and any other part of your vehicle.
Read your owner’s manual to determine if there is a reset procedure for your vehicle, expecially if it has a Battery Monitoring System (BMS).
Remove the negative terminal first and then remove the positive terminal by holding onto the rubber tubing and not the exposed metal terminal to avoid shock. Install the new battery by placing the battery back in the tray, tighten the clamps, and attach the cables starting with the positive one first. If you go to turn the key but the motor isn't turning over on your Ford F-150, you may have a bad starter. If your truck is rumblin' and stumblin' at idle, it is time to service the idle air control (IAC) valve. This article applies to the Ford F-150 (2004-2014), and the F-250, F-350 Super Duty (2005-2014). The F-150 is a hard working truck, except for when it fails on the job and refuses to start. Spark plug wires can affect your Ford F-150 or Super Duty in ways that will keep you scratching your head.
It can also erase vital learned information that is absolutely necessary for other modules to function normally. Wear rubber gloves and keep them and the battery away from your clothes so the acid doesn’t destroy them. About us Use of this site constitutes acceptance of the Terms of use, Cookie policy, and Privacy policy of eHow.


Your car battery lives 2 to 3 years, and if it lives longer, you should be ready with a replacement. So if your lights are dim, your car sounds weak when you're starting it, or if you are not getting any power at all, it means it's time for you to read this article and change your battery. If this is not the case, refer to the owner's manual of your vehicle to identify the battery location. Some cars store the battery under the back seat or in a special compartment in the front bumper. The owner's manual will identify the battery location and provide instructions for how to gain access. Sometimes it is connected directly to the negative battery post, but some cars attach it directly to the car body. Disconnect the cable and position it so that the end of the cable is not touching any grounded metal. You have never taken away the power supply to the central computer, although some electricity is still stored in the car's capacitor.
Even though the battery has been disconnected, there will still be a small amount of electricity that is stored in the engine. The easiest way to drain the electricity is to hold down on either the brakes or the car horn until there is no power left.
This will deplete all electrical components of having power, including the car's central computer. Many cars have a safety feature built into the computer where the memory will remain unaltered for a period of time after being cut off from a power supply. Once both cables have been connected, start the engine of the car to begin supplying power to all of the electrical components again, including the on-board computer. If you are resetting the computer due to a check engine light, you will get better results by using an OBD II scanner. This scanner will tell you precisely what is causing the error, and will allow you to delete the error code from the computer's memory, effectively turning the light off.



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