Bosch OBD 150 Originalbetriebsanleitung Seite 30

en 30 | OBD 150 | All you need to know about OBD
4. All you need to know
about OBD
4.1 What are OBD, OBD II, OBD-2
and EOBD
OBD (on-board diagnosis) means that
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Emission-related components and systems
are monitored by the vehicle whilst driving
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Any malfunctions are recorded and indicated
by a warning lamp (MIL)
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This information can be read by a diagnostic
tester
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A further purpose of OBD is to protect
vulnerable components such as catalytic
converters.
In these operating instructions, OBD is always
used to refer to the standard OBD-2 (OBD II).
OBD-2 has been obligatory in the USA for all
new vehicles since 1st January 1996. In the EU,
OBD-2 was introduced for new vehicles with
gasoline engine in January 2001 with the EURO-
3 standard and for diesel vehicles in January
2004. EOBD is the abbreviation for European
on-board diagnosis based on OBD-2.
The OBD diagnostic system is integrated into the
electronic control unit and constantly monitors
defined emission-related components in the
vehicle. The malfunction indicator light (MIL)
informs the driver of OBD faults reported by the
electronic control unit.
A minimum of five monitoring systems are
provided:
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Emission-related components
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Missing combustion
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Fuel system
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Upstream and downstream Lambda sensors
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Catalytic converter efficiency
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Exhaust gas recirculation
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Secondary air system
The following are permanently monitored:
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Missing combustion
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Fuel system (injection times)
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Circuits for emission-related components
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569630 Rev "D" 2016-02-19
The following are monitored once per drive
cycle:
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Lambda sensor function
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Catalytic converter function
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Speed, temperature and Lambda sensor val-
ues can also be read out by way of the OBD
diagnostic socket.
4.2 Is my vehicle provided with OBD
In the EU, OBD-2 was introduced for new vehicles
with gasoline engine in January 2001 with the
EURO-3 standard and for diesel vehicles in Janu-
ary 2003.
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Vehicles manufactured before these dates
may however also be provided with OBD.
4.3 Where is the OBD diagnostic
socket located
The OBD diagnostic socket is usually situated
in the driver's footwell in the area of the center
console or in the glove compartment.
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The installation location can also be looked
up in the owner's manual of the vehicle con-
cerned or found in the internet.
4.4 Why and when does the mal-
function indicator light (MIL)
come on
The malfunction indicator light must come on
briefly when switching on the ignition. The mal-
function indicator light must go out at the latest
when the engine is started. The MIL status (mal-
function indicator light "On" or "Off") is read
from the vehicle electronic control unit. If the
vehicle has detected an emission-related fault,
the status is set to "faulty". It is then no longer
possible to pass the exhaust emission test. In
such cases the malfunction indicator light is per-
manently lit to show the driver that the vehicle
should be taken to a workshop.
Robert Bosch GmbH