This graph is used to compensate line pressure with temperature. A cold transmission will shift harder. Depending on specific firmware this graph will compensate either line pressure or shift control pressure. The example above is line pressure. If it is for shift pressure the graph may have a rising slope.
When tuning a transmission from the start disable the temperature sensor. Then afterwards enable it and modify this graph when it is cold so that it could shift softly. Don’t go too soft as it may slip in some cases. Note that this graph should cross the zero line at working temperature.
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