Service Manual

Faults 7.2 Engine management
46
7
Engine protection function of the electronic
engine control EMR3
Depending on the design of the monitoring
functions, the EMR3 can protect the engine
from damage in certain fault situations by mo-
nitoring compliance with important limit values
during operation and checking the correct
function of the system components. Depen-
ding on how serious a detected fault is, the en-
gine may continue to operate with restrictions,
whereby the fault lamp indicates a serious sys-
tem fault by blinking. In this case, the engine
must be switched off as soon as it is safe to do
so. Depending on the engine configuration, the
blinking fault lamp may have the following me-
aning.
z Request to the operator to shut down
z Caution Failure to do so will void the warran-
ty!Automatic shutdown of the engine after a
short warning time, possibly connected with
a start prevention To cool down the engine,
forced engine operation at low ildling speed,
possibly with automatic shutdown.Start pre-
vention. See also
(  18 )
Use of the Diagnosis button
With the diagnosis button the fault at hand can
be read out as a blink code. The diagnosis but-
ton and the fault lamp are located in the vehicle
drive stand. The occurrence of errors is indica-
ted by flashing or steady lighting of the fault
lamp. More precise information regarding all
When the fault is corrected the light
goes out. For some faults it is neces-
sary to switch off the ignition, wait for
30 s and then switch the ignition back
on.
existing faults can be read out in the form of a
blink code, only when the engine is not run-
ning, in the following manner: After pressing
the diagnosis button for at least one second,
the fault light goes out and the first fault is out-
put as a blink code after releasing the button.
Analyse the blink code as per the table on the
following page. After outputting the fault blink
code, the fault lamp goes out for five seconds.
Then the next fault (i.e. the following one in the
fault memory) can be displayed by pressing
the diagnosis button. If the last existing fault
has been shown, by actuating the diagnosis
button once more the first fault will be shown
again.
Table of fault blink codes Diagnosis
button
The possible blink codes, their meaning and
measures for correcting faults can be found in
the table on the following page. The blink code
values in the first column indicate the number
of preliminary short blink signals (illuminated
duration approx. 0.4 s), the number of subse-
quent long blink signals (illuminated duration
approx. 0.8 s) as well as the number of conclu-
ding short blink signals. The code 2-1-4 for the
fault “overspeed” is made up of two short, one
long and four short blink signals, for example.
If a fault cannot be corrected by the measures
given in the table please contact your service
representative responsible.