BlueTec
®
exhaust gas aftertreatment off-highway version
4
The following indicator lamps could be available on the instrument panel:
Symbol
1
Reason for display/displayed message
þ
AdBlue
®
/DEF level
Fault message/action required (warning
before reduction in operating performance)
!
Check engine/exhaust gas
aftertreatment
Fault and misuse (failure in the monitoring
system)
È
lights up
(level 1)
Torque/speed limiter
active
2
Slight reduction in operating performance
È
flashes
(level 2)
Significant reduction in operating perform-
ance
Continuous brake
If increased braking power is required, the
engine can be equipped with a brake valve
downstream from the exhaust gas turbo-
charger in
conjunction with constant throttle
valves.
OM 904 LA/OM 924 LA constant throttle valve
:
Constant throttle valve
;
Pneumatically-actuated line
OM 926 LA constant throttle valve
:
Constant throttle valve
;
Hydraulically-actuated line
The brake valve uses exhaust back pressure
to increase braking power. The constant
throttle
valves
bring about a reduction of the
compression pressure in the power stroke
(third stroke), whilst the compression (sec-
ond stroke) is not significantly affected.
The constant throttle valve is an additional
valve in the cylinder head. When open, the
constant throttle valve establishes a connec-
tion between the combustion chamber and
4
Off-highway: vehicles without MOT approval.
1
Symbols may vary depending on the vehicle/equipment version.
2
In addition, a warning tone may sound.
26
General information
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