What controls shifting in automatic transmissions?
The most common type of automatic transmission uses hydraulic power to shift gears. This type of transmission has what is called hydraulic control. The transmission fluid is pressurized by an oil pump, which allows the speed to change depending on the vehicle’s speed, tire revolutions per minute, and other factors.
What sensors affect shifting?
Electrical Sensors that can affect automatic transmission operation.
Can a bad speed sensor affect shift timing?
Harsh or improper shifting. Without a valid speed signal from these sensors, the PCM will not be able to correctly control the shifting of gears within the transmission. This may cause the transmission to shift roughly or more quickly than normal. It’s also common that a problem with these sensors can impact the shift timing,…
How does a transmission speed sensor work in a car?
After registering data, the two transmission speed sensors, also commonly referred to as a vehicle speed sensors (VSS), send data to the powertrain control module (PCM), which compares these two inputs and calculates which gear the transmission should engage for efficient driving. The actual gear ratio is then compared to the desired gear ratio.
What are the symptoms of a bad speed sensor?
A faulty speed sensor can affect your speedometer operation and reduce your ability to drive safely. 5 Common Bad Speed Sensor Symptoms. Transmission problems. Vehicle speed information relayed by the VSS is used by the transmission control module (TCM) or powertrain control module (PCM) to determine shift timing.
Can a bad sensor cause automatic transmission problems?
This sensor may also cause the automatic transmission to go into failsafe mode – giving the appearance that the issue is more severe than it really is. The Turbine Shaft Sensor has the job of measuring the input shaft speed of the automatic transmission.