DTC P3147-239: Transmission Malfunction; DTC P3147-241: Transmission Malfunction: Description

The hybrid vehicle transmission assembly consists of the power split planetary gear unit, MG1, MG2, and the 2-stage motor speed reduction planetary gear unit. The power split planetary gear unit uses a planetary gear to split engine output in accordance with driving requests while the vehicle is driven or the HV battery is charged. MG2 assists engine output while increasing vehicle drive force. MG2 also converts the energy, which would otherwise be consumed in the form of heat during normal braking, into electrical energy. This recovered energy is put back into the HV battery to effect regenerative braking. The 2-stage motor speed reduction planetary gear unit reduces the output of MG2 in two stages, depending on vehicle speed. MG1 generates power, which is used for charging the HV battery or driving MG2. This regulation of the generation of electricity is used to control MG1 speed. In addition, MG1 is used as a starter motor to start the engine. The transmission input damper absorbs shock generated when the drive force from the engine is transmitted.