myecpro-laptop battery

1. Did not read the engine electronic control unit (ECU) records the fault code can not be dismantled before the battery cable

Because the fault code read before they hastily removed the battery cable or unplug the power supply fuse, due to interruption of power supply ECU, stored in its random access memory in the fault code will be automatically eliminate. If you want to re-access the fault information is necessary to repeat or reproduce the failure occurred when the working condition and environmental conditions, but who can not start the engine, so that the future operation would no longer be able to obtain fault code, lost an important failure to judge information, so Prior to the repair electric Inspiron 1100 battery,Inspiron 1150 battery motors, should be required to record the first ECU fault code, and then carry out other repairs.

2. Ignition switch is connected (ON) position, can not be easily removed battery cable

When the ignition switch is (ON) position, regardless of whether the engine running, you can not remove the batteries or unplug the power cord fuse. Because of sudden power cuts may produce self-inductance of the coil circuit electromotive force, which appears very high transient voltage (and sometimes even as high as ten thousand volts), so that ECU and related sensors, microelectronic devices were seriously damaged.

In addition, with the battery voltage is the same as any other electrical devices, wires, ignition switch in the ON position when they can not be removed, otherwise the same will produce self-inductance of the coil related to EMF, thus ECU or sensor. These electrical installations include: ignition system, idle speed stepper motor, ECU’s programmable read-only memory (PROM), fuel injector, air-conditioning, and other electromagnetic clutch, as well as some of the ECU connection lines.

3. Can not just remove Inspiron 1501 battery cable to use the method Clear fault code

For most electric motors run, remove the battery cable or remove the fuse leading to the ECU to maintain power for 30 seconds, you can clear the fault code stored in the ECU. But for some engines it is not suited to this approach, because the vehicle anti-theft, audio, quartz, etc. memory (including anti-theft password) are also stored in random access memory in the memory after the power failure will also be removed together, resulting in phenomena such as sound lock code on these engines should be based on the requirements of the maintenance manual methods to clear the fault code, and must not arbitrarily remove battery cable.