Diesel Exhaust Fluid Injection Pump
WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, and 2016 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
The Diesel Exhaust Fluid (DEF) injection pump is an assembly of two solenoid pumps, located in the DEF tank module.
The pressure pump provides 6.5 bar (94.27 lbf/in2 ) operating pressure. The 6.5 bar (94.27 lbf/in2 ) pressure is required to maintain the complete DEF atomization in the exhaust gas.
The purge pump is used to purge the DEF from the DEF line at engine shut-down to prevent freezing in the DEF injector at low temperatures.
The pumps receive a permanent power supply from the Battery Junction Box (BJB) and a Powertrain Control Module (PCM) controlled ignition signal from the Rear Junction Box (RJB). The PCM controls the ground connection of the pumps individually via hardwired connections.