User Manual

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User guide
| HDS 200/HDS 250
HD Scan Tool for Class 4-8 Diesel, Light and Medium Vehicles
581618 | REV. B | 11.2018
Bosch Automotive Service Solutions Inc.
SFI or SEFI:
Sequential fuel injection or sequential electronic fuel
Injection. A fuel injection system that uses one or more
injectors for each cylinder. The injectors are mounted in
the intake manifold and are fired individually.
Snsr:
Sensor
Solenoid:
A device consisting of an electrical coil which when
energized, produces a magnetic field in a plunger, which
is pulled to a central position. A solenoid may be used as
an actuator in a valve or switch.
Spd:
Speed
Src:
Source
ST:
Short-term
Std:
Standard
STFT:
Short term fuel trim
Stim:
Stimulation
STS:
Service throttle soon
Sup:
Supplemental
Sw:
Switch
Sw’d:
Switched
Sys:
System
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. 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.
Temp:
Temperature
TFP:
Transmission fluid pressure
TFT:
Transmission fluid temperature (sensor)
Thresh:
Threshold
Throt:
Throttle
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.
Torq:
Torque
Tot :
Total
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.
Trans:
Transmission
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.
Turbo:
Turbocharger
Util:
Utility
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 OBD II compliant.
Veh:
Vehicle
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