Dodge RAM 1500 2018 Diesel Supplement page 126

124 STARTING AND OPERATING
Starting Procedure — Engine Manifold Air
Temperature Below 0°F (-18°C)
In extremely cold weather below 0°F (-18°C) it may be
beneficial to cycle the manifold heaters twice before at-
tempting to start the engine. This can be accomplished by
turning the ignition OFF for at least five seconds and then
back ON after the "Wait To Start" telltale has turned off,
but before the engine is started. However, excessive cycling
of the manifold heaters will result in damage to the heater
elements or reduced battery voltage.
NOTE:If multiple pre-heat cycles are used before start-
ing, additional engine run time may be required to
maintain battery state of charge at a satisfactory level.
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 rap-
idly 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 heaters 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.