Lincoln Corsair: Automatic Transmission - Automatic Transmission – HF45 / Description and Operation - Pump Assembly - Plug-In Hybrid Electric Vehicle (PHEV)

Transmission Fluid Pump

The transmission fluid pump is an internal pump bolted to the transmission case. The transmission fluid pump is turned by the input shaft and circulates transmission fluid through the transmission for lubrication and through an oil-to-air cooler mounted in the front of the radiator for transmission cooling. The transmission fluid pump only operates when the engine is running. PHEV also have an electric auxiliary transmission fluid pump to circulate the transmission fluid during extended drive times without engine charging. The auxiliary transmission fluid pump is controlled by the ISC (inverter system controller).