Charge Air Cooler

Electrical power for the charge air coolant pump is supplied from the Powertrain Control Module (PCM) relay, located in the Engine Junction Box (EJB). When the relay is energized, it connects power from the startup battery to the charge air coolant pump. Operation of the charge air coolant pump is controlled by the PCM with a Pulse Width Modulation (PWM) signal. When the charge air coolant pump is running, engine coolant flows from the charge air coolant pump outlet through the charge air cooler. Afterwards to the charge air radiator and back to the charge air coolant pump inlet connection.