Diesel Exhaust Fluid Injection Pump

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The Diesel Exhaust Fluid (DEF) injection pump is an assembly of 2 solenoid pumps, located in the DEF tank module. The pressure pump provides 6.5 bar operating pressure. The 6.5 bar pressure is required to maintain the complete DEF atomization in the exhaust gas. The purge pump purges the DEF from the DEF line at engine shut-down to prevent freezing in the DEF injector at low temperatures. The pumps have a fused power supply from the Rear Junction Box (RJB). The Powertrain Control Module (PCM) controls the ground connection of the pumps individually via hardwired connections.