SECTION 4 –
ENGINE AND DRIVE SYSTEMS
4-7
DEF Quality Sensor
The DEF Quality Sensor (located inside
the tank) detects DEF tank level, as well as
quality and temperature of the DEF, which
are required for the Aftertreatment System to
function properly.
DEF Suction Strainer
The DEF Tank is equipped with a Suction
Strainer (located near bottom of tank). If
degraded system performance occurs,
remove drain plug (located at bottom of tank)
to drain sediment from tank. Remove and
clean Suction Strainer, ensuring the strainer
is reinstalled correctly when finished.
NOTE: Flush DEF Tank and components
with distilled water only to remove
any contamination. Refer to the
engine manufacturer’s operation
manual for further information.
DEF Supply Module Filter
(Located near the bottom
of the DEF Supply Module)
-Typical View
DEF Suction Strainer and Drain Plug
(Located near bottom of the DEF Tank)
-Typical View
• DEF
Suction
Strainer
• DEF Tank
Drain Plug
Summary of Contents for STS12i Combo
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