Actron OBD II AutoScanner CP9175 Instructions Manual page 58

STFT:
Short Term Fuel Trim.
STS:
Service Throttle Soon.
TAC:
Throttle Actuator Control.
TBI:
Throttle Body Injection. A fuel injection system having one or more
injectors mounted in a centrally located throttle body, as opposed to
positioning the injectors close to an intake valve port. Central Fuel
Injection (CFI) is another name for TBI on some vehicles.
TCC:
Torque Converter Clutch.
TCM:
Transmission Control Module.
TCS:
Traction Control System for PCM and brakes.
TDC:
Top Dead Center. When a piston is at its uppermost position in the
cylinder.
TFP:
Transmission Fluid Pressure.
TFT:
Transmission Fluid Temperature (Sensor.)
Throttle Body:
A device which performs the same function as a carburetor in a fuel
injection system. On a throttle body injection (TBI) system, the throttle
body is both the air door and the location of the fuel injectors. On port
fuel injection systems (PFI, MPFI, SFI, etc.), the throttle body is simply
an air door. Injectors receive fuel as each intake port activates. In each
case, the throttle body is attached to the accelerator pedal.
TPS:
Throttle Position Sensor. Potentiometer-type sensor connected to the
throttle shaft. Its voltage signal output increases as the throttle opens.
The PCM uses this signal to control many systems such as idle speed,
spark advance, fuel delivery, etc.
A-10