• NH3 sensor
• Temperature sensors
• SCR catalyst
The DEF injection system and SCR catalyst enable the
achievement of diesel emissions requirements; while
maintaining outstanding fuel economy, drivability,
torque and power ratings.
Refer to “Electronic Vehicle Information Center (EVIC) or
#Driver Information Display (DID)” in “Understanding
Your Instrument Panel” for system messages and warn-
ings.
NOTE:
• Your vehicle is equipped with a DEF injection system.
You may occasionally hear an audible clicking noise.
This is normal operation.
• The DEF pump will run for a period of time after
engine shutdown to purge the DEF system. This is
normal operation.
274 STARTING AND OPERATING
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