The present invention provides a method for approximating the flow rate of hydraulic fluid in an automatic transmission. The method includes estimating a flow rate value for each of a plurality of temperatures. Thereafter, the current transmission temperature is measured. The flow rate corresponding to the current transmission temperature is then learned in the following manner. The process of learning the flow rate initially includes identifying the presence of a predefined shift aberration. If the predefined shift aberration was not identified, the flow rate estimation corresponding to the current transmission temperature is iteratively adjusted. If the predefined shift aberration was identified, the flow rate estimation corresponding to the current transmission temperature is reversed by one iterative step thereby providing the learned flow rate value for the current transmission temperature.