However, as mentioned above, if it receives a signal that is outside of the expected range, it will switch to secondary/emergency operation. These procedures are designed to protect the transmission from further damage that could be caused by the signal error.Īs long as the computer is receiving signals from the MAP, TPS, vehicle speed and other sensors that fall within their “normal” ranges based on the current conditions, the transmission will operate normally. When the signal value sent by a sensor to the computer is not within a pre-programmed range specified by the manufacturer, it will switch to “secondary” programming. The manifold absolute pressure (MAP) sensor and throttle position sensor (TPS) provide the engine’s load information which is used to manage the shift and downshifting in the transmission when you’re driving up an incline or you’ve put the pedal to the metal.įail Code conditions or “Limp Mode” occurs when there is a problem with the logic of a vehicle’s computer. The vehicle speed sensor provides input to help control ABS, fuel mixture, fuel injection and transmission operation. Today, nearly every system in your vehicle is operated by the computer – including the transmission’s line pressure, shift timing, sequence and feel. How the Computer Determines That a Sensor is Incorrect.Naturally, the first questions that go through your head are: Why did this happen? How severe is it? and How much will it cost to fix?
Limited to one gear and 30-45 mph, you know there is a serious problem with your car’s transmission and you have to get your car to either your dealer or transmission repair shop to have the problem diagnosed and repaired.
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