Join Date: Jan 2013
Location: Central California
While the real time fuel settings are a combination of the base map and fuel trim tables, you DO HAVE TO accept the trims if you want your AT to continue tuning, especially early on. When setting up the AT functions in the PCV, one of the things you do is set the limits on how much fuel the AT is permitted to add/remove. This is done in order to safeguard the engine should an O2 sensor crap out on you as it will prevent the AT from making any drastic changes.
Say for example you set the maximum "add" to 10 and "remove" to 5. The AT is now restricted to that variance from the base map. If at a certain RPM/throttle combination the AT determines it wants to add more than 10 (or remove more than 5), it must wait until you accept the trims thereby "clearing the slate" on the trim table. With the base map adjusted and the trim table zeroed out, the AT can then resume tuning until it once again hits the limits.
When you no longer see any of the limit numbers (10 or -5 in this example) in any of the cells on your trim table, the AT is essentially done tuning your bike. Some folks even turn off and/or remove their AT at this point. If left on, it will continue to adjust for changes in riding conditions, but you no longer need to continue the routine of accepting the trims because they more than likely will remain within the limits. If you decide down the road that you want to change your intake/engine/exhaust set up or start playing with your air/fuel ratio target table, the process of accepting the trims starts all over again.
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