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.
Inp:
Input
Inst:
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
PCM indicating the temperature of the incoming air. The
PCM uses this signal for fuel delivery calculations.
Max:
Maximum
Mgt:
Management
MIL:
Malfunction indicator lamp. The MIL is most commonly
known as the check engine or service engine soon light.
A required on-board indicator to alert the driver of an
emission-related malfunction.
Min:
Minimum
Misfire:
Caused by the air fuel ratio being incorrect.
Monitor:
A test performed by the on-board computer to verify
proper operation of emission-related systems or compo-
nents.
MPFI or MFI:
Multi-port fuel injection. MPFI is a fuel injection system
using one (or more) injector(s) for each cylinder. The
injectors are mounted in the intake manifold, and fired in
groups rather than individually.
Neu:
Neutral
Nom:
Nominal
NOx:
Oxides of nitrogen. The system EGR and Camshafts
injects exhaust gases into the intake manifold to reduce
these gases at the tailpipe.
O2S:
Oxygen sensor. Generates a voltage of 0.6 to 1.1 volts
when the exhaust gas is rich (low oxygen content). The
voltage changes to 0.4 volts or less when the exhaust
gas is lean (high oxygen content). This sensor only oper-
ates after it reaches a temperature of approximately
349ºC (660ºF). O2 sensors are usually found both
upstream and downstream of the catalytic converter.
The PCM uses these sensors to fine tune the air-fuel
ratio and to monitor the efficiency of the catalytic con-
verter. See Bank 1, Bank 2, Sensor 1, Sensor 2.
OBD II:
On-board diagnostics, second generation. OBD II is a
U.S. Government-mandated standard requiring all cars
and light trucks to have a common data connector,
connector location, communication protocol, DTCs and
code definitions. OBD II first appeared on vehicles in
late 1994, and is required to be present on all cars sold
in the US after January 1, 1996.
ODM:
Output device monitor
OP:
Operating
Open loop (OL):