Dodge 2015 RAM Owner's Manual page 220

218 STARTING AND OPERATING
1. If the engine stalls after the initial start, the ignition
must be turned to the OFF position for at least five
seconds and then to the ON position to recycle the
manifold heaters.
NOTE: Excessive white smoke and poor engine perfor-
mance will result if manifold heaters are not recycled.
2. Heat generated by the manifold heaters dissipates
rapidly in a cold engine. If more than two minutes
pass between the time the "Wait To Start" telltale turns
off and the engine is started, recycle the manifold
heaters by turning the ignition switch to the OFF
position for at least five seconds and then back ON.
3. If the vehicle is driven and vehicle speed exceeds
19 mph (31 km/h) before the manifold heater post-
heat (after start) cycle is complete, the manifold heat-
ers will shut off.
4. If the engine is started before the "Wait To Start"
telltale turns off, the preheat cycle will turn off.
5. If the engine is cranked for more than 10 seconds, the
post-heat cycle will turn off.
NOTE:
• Engine idle speed will automatically increase to 1,000
RPM and engage the Variable Geometry Turbocharger
at low coolant temperatures to improve engine warm-
up.
• When a diesel engine is allowed to run out of fuel or
the fuel gels at low temperatures, air is pulled into the
fuel system. If your engine has run out of fuel, refer to
"Maintenance Procedures/Priming If The Engine Has
Run Out Of Fuel" in "Maintaining Your Vehicle" for
further information.