Motor Electronics Cooling Pump (MECP)
The motor electronics cooling system is required to maintain an acceptable temperature for the transaxle and the DC/DC converter. The system temperature is monitored by the motor electronics coolant temperature (MECT) sensor, which is an input to the PCM. The PCM commands the MECP using the MECP relay. The MECP is commanded on whenever the traction battery contractors are closed. The coolant in the system flows in a loop from the MECP, to the transaxle, then into the motor electronics radiator bottom hose port, out of the top hose port of the motor electronics radiator, into the DC/DC converter, and back into the MECP. The cooling system has a degassing system that is connected in parallel between the electronics radiator and the MECP. The degassing system bleeds air/gases into the coolant reservoir.