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The control module is powered by a permanent feed from the Battery Junction Box (BJB), and communicates with the ATC AUXILIARY COOLANT PUMP The auxiliary coolant pump is mounted on the heater casing and is used to assist coolant flow through the FFBH and the The auxiliary coolant pump runs continuously while the FFBH is active. When the FFBH is inactive, coolant flow is reliant on Stop/Start Vehicles - From 2010 MY During a Stop/Start cycle when the engine is shutdown and consequently the engine-driven coolant pump is stationary, the ECM (engine control module) , has been integrated into the cooling system to maintain the coolant flow through the cabin’s heater core. This supporting circulation prolongs the On vehicles fitted with a Fuel Fired Booster Heater (FFBH) the additional auxiliary coolant pump is not installed. In its CJB (central junction box) . For additional information, refer to: Starting System (303-06C Starting System - TD4 2.2L Diesel, Vehicles Built From: 01-03-2009, Description and Operation). AMBIENT AIR TEMPERATURE SENSOR |