User Manual

581618 | REV. B | 11.2018
Bosch Automotive Service Solutions Inc.
HDS 200/HDS 250
HD Scan Tool for Class 4-8 Diesel, Light and Medium Vehicles
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User guide | 47
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en
Diagnostic trouble code. An alphanumeric identifier for a
fault condition identified by the on board diagnostic
system.
Duty Cycle:
A term applied to signals that switch between on and
off. Duty cycle is the percentage of time the signal is on.
For example, if the signal is on only one fourth of the
time, then the duty cycle is 25%. The PCM uses duty
cycle type signals to maintain precise control of an
actuator.
EBCM:
Electronic brake control module
EBTCM:
Electronic brake/traction control module
ECM:
Engine control module or electronic control module
Eco:
Economy
ECT:
Engine coolant temperature sensor. See CTS.
EEPROM:
Electrically erasable programmable read only memory
EFE:
Early fuel evaporation
EFI:
Electronic fuel injection. Any system where a computer
controls fuel delivery to the engine by using fuel injec-
tors.
EGR:
Exhaust gas recirculation. The PCM uses the EGR system
to recirculate exhaust gases back into the intake mani-
fold to reduce emissions. EGR is used only during warm
engine cruise conditions.
Eng:
Engine
EOP:
Engine oil pressure (switch)
EOT:
Engine oil temperature (sensor)
EPA:
Environmental protection agency
Equip:
Equipment
ESC:
Electronic spark control. An ignition system function that
warns the PCM when knock is detected. The PCM then
retards spark timing to eliminate the knocking condition.
Est:
Estimated
EST:
Electronic spark timing. An ignition system that allows
the PCM to control spark advance timing. The PCM
determines optimum spark timing from sensor informa-
tion — engine speed, throttle position, coolant tempera-
ture, engine load, vehicle speed, Park/Neutral switch
position, and knock sensor condition.
EVAP:
Evaporative emissions system
Exh:
Exhaust
FC:
Fan control
Fltr:
Filter
Freeze frame:
A block of memory containing DTCs of the vehicle oper-
ating conditions for a specific time.
Freq:
Frequency
Frict:
Friction
FTP:
Federal test procedure. Strict test of vehicle’s emissions.
Gen:
Generator
Ground (GND):
An electrical conductor used as a common return for an
electric circuit(s) and with a relative zero potential
(voltage).
Hall effect sensor:
Any of a type of sensor utilizing a permanent magnet and
a transistorized Hall Effect switch. Hall Effect type sen-
sors may be used to measure speed and position of the
crankshaft or camshaft — for spark timing and fuel injec-
tor control.
HO2S:
Heated oxygen sensor. See O2S.
HRes:
High Resolution
Htr:
Heater
HVAC:
Heating, ventilation, & air conditioning (system)
Hydr:
Hydraulic
I/M:
Inspection and maintenance. An emission control pro-
gram.
IAC:
Idle air control. A device mounted on the throttle body
which adjusts the amount of air bypassing a closed
throttle so that the PCM can control idle speed.
IAT:
Intake air temperature (sensor)
ICM:
Ignition control module.
Id:
Identification
Id:
Identifier
Ign:
Ignition
IMRC:
Intake manifold runner control
Inj:
Injector