Note: these abbreviations are from the GM workshop manual but are fairly common for most makes and models. Describe what they mean below.
PCM: Power-Train Control Module.
The Power-Train Control Module is a combined control unit, consisting of the Engine Management ECU and the Transmission Control Unit
TCC: Torque Converter Clutch
The Torque Converter Clutch acts as the equivalent of a manual clutch. It separates the load from the power source
TPS: Throttle Position Sensor
The Throttle Position Sensor or TPS is a sensor that monitors the position of the throttle in an internal combustion engine
ECT: Engine Coolant Temperature
The Engine Coolant Temperature is a sensor that turns on the electric fan or sends a signal to the operator when the coolant reaches a temperature above it's recommended parameters
VSS: Vehicle Speed Sensor
Detects how fast the wheel is rotating by using a rotor tooth and sensor that sends a signal to the ECU
PSA: Transmission Range Fluid Pressure Switch Assembly
The PSA is a sensor that detects all the shift points in the shifting of the gears in an Automatic Transmission
TTS: Transmission Temperature Sensor
The TTS lets the ECU know how warm or cold the transmission fluid is and adjusts the timing of the shifts.
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