Newer transmission control modules can use the data from the sensor to modify the operation of the torque converter lockup clutch, or the line pressure. If an overheat event was detected, the transmission control unit may activate a limp mode to protect the transmission from further damage. The TFT sensor is often used by older transmission control units to monitor the health of the transmission. The ISS sensor helps the transmission control module to calculate the correct amount of slippage to apply to the transmission clutches, bands, and torque converter clutch. It can also help the TCM to control function on the torque converter. The WSS sensor data can help the transmission control module to understand what the vehicle is currently doing, so it can adjust the shift program accordingly. If this sensor goes bad, the TCM may select the wrong gear ratio, and the transmission may slip. The transmission control module uses this VSS sensor to determine how fast the vehicle is going, so it will know when it’s time to change gears. The TCM can also compare this data to the vehicle speed sensor data, to determine which shift program would best suit the situation. This information can help the TCM determine if an upshift or downshift will be necessary. The signal coming from the throttle position sensor tells the transmission control module how much load is being placed on the engine. The TPS sensor provides one of the most important data sources to the transmission control module. In order to decide what gear ratio is appropriate, the TCM has to interpret data from a number of sensors including Or it could be located inside the transmission next to the valve body. The transmission control unit may be located outside the transmission in-line with the wiring harness. transmission fluid) down the right channel to engage a clutch or lock/unlock a planetary gearset. It’s responsible for activating solenoid’s, which then direct the flow of pressurized hydraulic fluid (a.k.a.
In a nutshell, a transmission control module is a collection of circuit boards and microprocessors. What Transmission Do I Have? What is a transmission control module and how does it work?
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