Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 213
Figure 16.3 DEF System State Control
DEF becomes a solid form at temperatures below -11DegC. To ensure that
the DEF remains soluble in cold ambient and NOx emissions can be
controlled the DEF system is fitted with electrical heating elements within the
DEF pump and around the DEF lines. Thaw of the fluid within the DEF tank is
provided by the supply of engine coolant to the tank header unit via the
operation of the coolant diverter valve.