power. As soon as allowed after the DPF lamp
illuminates, maintain highway speeds to allow
automatic regeneration, or park the vehicle in a
safe location and perform a parked regen.
A DPF lamp blinking at the same time as a steadily
illuminated yellow Check Engine lamp indicates that
a parked regen must be performed immediately, or
an engine derate will occur. If the red Stop Engine
lamp illuminates with the blinking DPF lamp and the
yellow Check Engine lamp, a parked regen must
occur or an engine shutdown will occur. Park the ve-
hicle and perform a parked regen. See
Fig. 9.12 and
Fig. 9.4.
The DPF regen switch, located on the dash, may
have three selectable positions:
•
Request Regeneration
•
Default (can include appropriate normal state
condition—either in an automatic regeneration
or inhibit state)
•
Inhibit regeneration (optional when available)
NOTE: The regen switch can start a regen only
when at least one of two conditions exists: ei-
ther the DPF lamp is lit, or the engine software
calls for it. If neither of those conditions exist,
the regen switch cannot cause a regen to hap-
pen.
The function of the switch will vary by the engine
make and model in the vehicle. See the engine op-
eration manual for switch operation details.
When diesel particulate filter servicing is needed, it
must be performed by an authorized technician, and
a record must be maintained for warranty purposes.
The record must include:
•
date of cleaning or replacement
•
vehicle mileage
•
particulate filter part number and serial number
A steadily illuminated Malfunction Indicator Lamp
(MIL) indicates an engine fault that affects the emis-
sions. The MIL lamp applies to the Mercedes-Benz
engine only. See
Fig. 9.13.
High-Soot-Load Idle Shutdown
Extended idle operation can cause soot to accumu-
late in the DPF, which can eventually trigger an ECM
fault, cause the Stop Engine lamp to illuminate, and
require replacement of the DPF. The High-Soot-Load
Idle Shutdown feature (if equipped), determines if the
extended engine idling needs to be shut down before
there is a triggering of the stop engine warning.
The High-Soot-Load Idle Shutdown feature monitors
the soot load during the idle or high-idle operation. If
high-soot-load occurs, the DPF lamp will illuminate,
09/11/2007 f490294
Fig. 9.11, Exhaust Diffuser
07/09/2009 f611036
123
CHECK
STOP
1. Malfunction Indicator Lamp (MIL)
2. Check-Engine Lamp
3. Stop-Engine Lamp
Fig. 9.12, Engine Protection Lamps
09/25/2006 f610814a
Fig. 9.13, Malfunction Indicator Lamp (MIL)
Exhaust Aftertreatment Systems
9.9
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