Transmission Oil Pump Operation

The transmission oil pump is located just behind the torque converter, between the pump housing and cover assemblies. The torque converter drives the pump assembly using a chain and sprockets. The transmission oil pump is a double-stroke vane pump. The transmission oil pump has dual chambers, two inlet and two outlet ports, allowing it to produce the fluid volume necessary for all operating conditions. The transmission oil pump draws fluid through a filter and pressurizes the fluid as the transmission oil pump rotates. After the fluid is pressurized, it exits the transmission oil pump through two exhaust ports that feed the system pressure valve. The system pressure valve maintains fluid pressure and allows excess pressure to be returned to the transmission oil pump. This reduces cavitation and noise. A slipping clutch can often be determined by comparing which internal units are applied in the various gear ranges. The Solenoid Application chart provides a basis for analyzing road test results.

TP = Touch Point Pressure

± = Variable Actuation