Auxiliary Coolant Pump
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary coolant pump is an electric pump attached on a bracket, at the rear left side of the engine.
When the engine is turned off the auxiliary coolant pump provides engine coolant flow to prevent coolant boiling in the turbocharger and in the integrated exhaust manifold.
The auxiliary coolant pump has a 3 pin connector. A pin receives a permanent startup battery voltage, supplied from a fused output from the right Engine Junction Box (EJB). The second pin has a hardwired connection to the Powertrain Control Module (PCM) and the third pin has a ground connection.