tramp_drift240 wrote:
now srsly, what's the ECU have to "relearn" after you disconnect the battery?
i thought battery cutoff was a common thing for theft prevention.
well i dont want to type out everything but a quick search online came up with the basic idea, the ecu has to fine tune the controls do to things like weather conditions, parts being worn, driving conditions, and driving habbits, and resetting your ecu causes all of this data to be lost, which means decreased performance untl it relearns. Only the factory preset maps are saved when you reset the ecu.Your ecu also controls timing, in accordance with what octane rating fuel you are using.
but anyways here is the simple but accurate description that i found online
"The ECU of your car is like its brain. For your car to deliver it’s best performance you have to keep it in a fit condition at all times. This is the only way to ensure that you get the best in both driving as well as handling. Modern day cars do not have manual controls. Nowadays sophisticated technology is being incorporated in the form of computerized controls that guide and ensure Engine performance. Whenever you make a physical intervention the data pertaining to such intervention gets recorded in the memory banks of your car’s computer. The computer uses the mapped data to work out the optimum control conditions in which the engine should function. The ECU shuffles through the tons of data that come to it in the form of readings to decide the course of action that should be taken by the engine to ensure an ideal drive. The ECU tells your engine not only what to do but also how to do it. Thus the ECU in order to make accurate diagnosis on engine control utilizes stored data."
if you want to learn more theres alot of great site where you can find this info.