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CAUTION!
Extended periods of idle time may not allow the
vehicle’s exhaust aftertreatment system to properly
regenerate. This can lead to the illumination of the
Malfunction Indicator Light (MIL) or an Electronic
Vehicle Information Center (EVIC) warning message.
Operating the engine for extended periods with the
MIL illuminated or an EVIC warning message dis-
played can cause extensive engine and exhaust sys-
tem damage.
NOTE: For EVIC messages related to the vehicle’s
exhaust system, refer to “Intervention Regeneration
Strategy — EVIC Message Process Flow” in Section 7 of
this manual.
An optional driver-controlled high idle speed is available
on automatic transmission equipped vehicles with speed
control. This feature allows the driver to select an el-
evated idle speed between 1,100 and 1,500 RPM. Your
dealer can enable this feature.
The optional driver-controlled high idle speed will help
increase cylinder temperatures and provide additional
cab heat, however, may still cause the exhaust aftertreat-
ment system to not properly regenerate. Extended peri-
ods of idle time should be avoided.
Stopping The Engine
Idle the engine a few minutes before routine shutdown.
After full load operation, idle the engine three to five
minutes before shutting it down. This idle period will
allow the lubricating oil and coolant to carry excess heat
away from the combustion chamber, bearings, internal
components, and turbocharger. This is especially impor-
tant for turbocharged, charge air-cooled engines.
48 STARTING AND OPERATING