dash, check the gauge with the engine off. If the yel-
low signal stays locked in the red zone once the en-
gine is shut down, or is at or above the values
shown in
Table 4.2, the air cleaner element needs to
be replaced.
Vehicles may be equipped with a go/no-go restriction
indicator without graduations (see
Fig. 4.7) instead of
a graduated indicator.
Air Intake Maximum Restriction Values (inH
2
O)
Engine Make
Pre-EPA07
Engines
EPA07 and
Newer Engines
Cummins 25 25
Detroit 20 22
Mercedes-Benz 22 22
Table 4.2, Air Intake Maximum Restriction Values
Application Air Pressure Gauge
An application air pressure gauge registers the air
pressure being used to apply the brakes, and should
be used for reference only. The gauge will not regis-
ter air pressure until the foot brake pedal is de-
pressed or the trailer hand brake is applied.
f080156
EXHAUST AFTERTREATMENT SYSTEM INFORMATION
Switch.
Level 1 Level 3Level 2 Level 4
Filter Regeneration
Recommended.
Filter is reaching
Bring vehicle to
highway speeds to
Filter
Regeneration
Filter is now
reaching maximum
capacity
.
To avoid engine
derate, bring vehicle
Parked Regeneration
Required − Engine
Derate
Filter has reached
maximum capacity
.
Vehicle must be
parked, and a Parked
Service Regeneration Required.
Engine Derate To Idle Only.
Filter has exceeded maximum
capacity.
Vehicle must be parked, and a
Service Regeneration must be
(Solid)
(Flashing) (Flashing)
CHECK
INDICATOR
LAMP(S)
Indicator Lamp
Message(s)
Diesel Particulate
Filter Condition
Required Action
capacity
.
STOP
allow for an
Automatic
Regeneration or
perform a Parked
to highway speeds
to allow for an
Automatic
Regeneration, or
perform a Parked
Regeneration as
soon as possible.
Regeneration must
be performed.
Engine will begin
derate.
performed. Check engine
operator’s manual for details.
Engine will shut down.
For a driver performed Parked Regeneration, vehicle must be equipped with a dash mounted Regeneration Switch.
02/20/2009
W
ARNING
HEST (High Exhaust
System Temperature)
Exhaust components
and exhaust gas are at
high temperature. When
stationary, keep away
from people and
flammable materials or
vapors.
A regeneration is in
progress.
Flashing
Solid
Regeneration.
Necessary
Fig. 4.5, ATS Warning Lamps
10/10/2001
f610568
Fig. 4.6, Air Intake Restriction Indicator
Instruments
4.8
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