Extended Idling And Aftertreatment System Conditioning - Mack Granite GU Series Operator's Handbook Manual

238 OPERATION
Extended Idling and Aftertreatment System
Conditioning
Extended idling performed on this vehicle equipped with an exhaust
aftertreatment system should be carried out at a low engine idle speed. There
is no benefit to using a raised engine idle speed for extended idling. The
only exception is for active PTO operation. Utilizing an engine speed above
1300 rpm is recommended for vehicles which perform extended idling with an
active PTO.
During periods of extended idling, normally greater than 8 hrs, the catalyzed
DPF system needs to perform a routine conditioning cycle. The conditioning
cycle is controlled by the Engine ECU and will start and stop automatically
as needed. The ATS conditioning is required to maintain normal exhaust
aftertreatment system function and should not be stopped. ATS conditioning
will not occur on non-catalyzed DPF systems.
During these events the engine speed will increase to approximately
1050–1400rpm, for non-PTO operation, in order to complete the exhaust
aftertreatment conditioning cycle. Exhaust temperatures will also elevate
slightly but remain much lower than those reached during regeneration and
present no danger.
If a compatible driver display is available a message will be displayed when
the conditioning cycle is in progress. The message indicated in the driver's
display will be "ATS Conditioning in Progress, No Action Required." If no driver
display is available there will be no indication of an ATS conditioning event
except for the automatic increase in engine speed.
IF ATS conditioning is unsuccessful and extended idling is continued a yellow
lamp will be displayed. If this fault occurs extended idling should be stopped
and driving resumed as soon as possible. If a yellow lamp is active and idling
is continued a red lamp will be displayed and finally an engine shutdown.
In the event that a red lamp is reached during extended idling the vehicle
should be serviced to diagnose the problem in the aftertreatment system
and inspect the DPF system for damage. Aftertreatment system hardware
problems, driver intervention, and certain PTO operations could cause an
ATS conditioning to fail.