en
|
5 4
| User guide |
OBD 1350
ProGrade OBDII Scan Tool
580001 | REV. A | 11.2016
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. TBI is also called Central
Fuel Injection (CFI) in 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 carbure-
tor in a fuel injection system. On a throttle body injec-
tion (TBI) system, the throttle body is both the air door
and the location of the fuel injectors. On port fuel injec-
tion systems (PFI, MPFI, SFI, etc.), the throttle body is
simply an air door. Fuel is not added until the injectors
at each intake port are activated. 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 is opened. The PCM uses this
signal to control many systems such as idle speed, spark
advance, fuel delivery, etc.
Traction assist:
Assist in traction with brakes only.
Trip:
Vehicle operation for a period of time so the systems can
be monitored.
TTS:
Transmission temperature sensor. A resistance sensor
mounted in the transmission housing in contact with the
transmission fluid. It sends a voltage signal to the PCM
indicating the temperature of the transmission.
VECI:
Vehicle emission control information. A decal located in
the engine compartment containing information about
the emission control systems found on the vehicle. The
VECI is the authoritative source for determining whether
a vehicle is OBDII compliant.
VIN:
Vehicle identification number. This is the factory-
assigned vehicle serial number. This number is stamped
on a number of locations throughout the vehicle, but the
most prominent location is on top of the dashboard on
the driver’s side, visible from outside the car. The VIN
includes information about the car, including where it
was built, body and engine codes, options, and a
sequential build number.
VSS:
Vehicle speed sensor. Sends a frequency signal to the
PCM. The frequency increases as the vehicle moves
faster to give the PCM vehicle speed information used to
determine shift points, engine load, and cruise control
functions.
VTD:
Vehicle theft deterrent
Warm-up cycle:
Warm-up cycle is when the engine coolant temperature
rises at least 40 degrees above that at engine start up.
WOT:
Wide-open throttle. The vehicle operating condition
brought about when the throttle is completely (or
nearly) open. The PCM typically delivers extra fuel to the
engine and de-energizes the A/C compressor at this time
for acceleration purposes. The PCM uses a switch or the
TPS to identify the WOT condition.
