A degraded fluid can accelerate clutch wear. The fact that these transmissions allow us to enjoy the car as it ages does not mean that ATF should not be replaced when necessary. If the transmission has adapted to the pressures of a very old fluid, replacing fluid with new one without performing a relearn might result in a transmission that does not function well or transmission that does not function at all. If a component of the transmission is changed or the fluid is replaced and transmission relearn is not done, it can result in rough or erratic shift and transmission damage. WHAT COULD HAPPEN IF TRANSMISSION RELEARN IS NOT DONE? For instance, when transmission control unit, solenoid, transmission fluid, clutches are changed, this procedure should be carried out. When any transmission part is charged or transmission service is done, performing a relearn process is necessary.
In some cars, all you need to do is to drive and the transmission performs the relearn procedure automatically. Relearning in some cars could entail following an instructed driving pattern, usually a drive and stop pattern, a number of times, over a particular distance. It continues to learn to fine-tune these values. This is the process whereby the transmission relearns new shift pressure and timing values. Resetting the transmission is resetting the transmission control unit such that the stored shift pressure and timing values that have been learned over time are reset to default values.
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This is why many vehicle manufacturers claim to have maintenance free transmissions with lifetime fluids in them. The values can also change when a transmission component or fluid is replaced.Īdaptive transmission function should not be confused with driver's driving style adaptation that has more to do with how responsive the throttle is, based on driving style.Īdaptive transmission function makes the transmission to last longer, enables the use of transmission fluid for a longer period, reduces frequency and cost of maintenance and improves shift feel and comfort.Īdaptive transmissions make maintenance free operation of the transmission possible. This learning process is continuous as the components and fluid age until the limit is attained. What adaptive transmissions do is to keep learning the shift pressure and timing values and adjust them accordingly by using the new values for the next application of shift pressure and timing.
The transmission control unit automatically does this adjustment. Because of changes in the properties of the fluid, like viscosity and so on and also due to changes in the tolerance of the internal parts, the fluid pressure and timing changes. This shift pressure and timing in the valve body of the automatic transmission controls the application of the clutches.Īs the automatic transmission ages, the internal parts wear and the transmission fluid also wears out due to heat and sediments.
Two important parameters in the operation of an automatic transmission are shift pressure and shift timing. We can say that transmissions have become smart with the introduction of machine learning algorithms. Modern transmissions are not as simple as they used to be. WHAT IS ADAPTIVE AUTOMATIC TRANSMISSION RESET AND RELEARN? What is adaptive automatic transmission reset and relearn?
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