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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
Inp:
Input
Inst:
Bosch Automotive Service Solutions Inc.
HDS 200 HD Scan Tool for Class 4-8 Diesel, Light and Medium Vehicles | User guide | 47 | en
Instant
Intk:
Intake
IPC:
Instrument panel cluster
ISC:
Idle speed control. A small electric motor mounted on
the throttle body and controlled by the PCM. The PCM
can control idle speed by commanding the ISC to adjust
its position.
ISO:
International Organization of Standardization also know
as International Standards Organization.
JStick:
Joystick
KAM:
Keep alive memory
Knock sensor (KS):
Used to detect engine detonation or knock. The sensor
contains a piezoelectric element and is threaded into the
engine block. Special construction makes the element
sensitive only to engine vibrations associated with deto-
nation.
Knock:
Uncontrolled ignition of the air/fuel mixture in the cylin-
der. Also referred to as detonation or ping. Knock indi-
cates extreme cylinder pressures or "hotspots" that are
causing the air/fuel mixture to detonate prematurely.
KOEO:
Key ON engine OFF. Turn the ignition key to on, but don't
start the engine.
KOER:
Key ON engine running. Start the vehicle.
LCD:
Liquid crystal display
LT:
Long-term
LTFT:
Long term fuel trim
Lvl:
Level
M/T:
Manual transmission or manual transaxle.
MAF:
Mass air flow (sensor). Measures the amount and den-
sity of air entering the engine and sends a frequency or
voltage signal to the PCM. The PCM uses this signal in
its fuel delivery calculations.
MAP:
Manifold absolute pressure (sensor). Measures intake
manifold vacuum or pressure and sends a frequency or
voltage signal (depending on sensor type) to the PCM.
This gives the PCM information on engine load for con-
trol of fuel delivery, spark advance, and EGR flow.
MAT:
Manifold air temperature (sensor). A resistance sensor
in the intake manifold that sends a voltage signal to the
581618 | REV. A | 11.2017
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