![]() ![]() The Gear Actuator assembly is sold as a component. While the shift motors are identical, the connectors are unique, so you cannot swap the motors for testing purposes. The mechanically selected range is verified by a sensor located at each motor and solenoid in the assembly. One motor and solenoid shift the odd gear rail while the other set shifts the even gear rail. The actuator consists of two motors and two solenoids that engage internal linkage in the transmission to shift separate shift rails (figure 3) independently. The TCM controls gear selection by operating the Gear Actuator assembly. The TCM uses inputs from the driver, ECU, Skid Control Unit, and other sensors to determine clutch actuation and gear selection. A failing flywheel can cause vibrations and rattling or banging noises.Ī stand-alone TCM controls vehicle launch and shift timing by commanding the actuators according to driver input and vehicle sensor feedback. Check the flywheel for excessive lateral movement, damaged or broken dampener springs, and worn drive teeth. Inspecting the flywheel when the unit is removed is crucial to service the clutch assembly. The 7-speed DCTs use a dual-mass flywheel. All actuators and sensors are serviceable without removing the transmission. The unit is also equipped with an inhibitor switch. In addition, two input speed sensors provide TCM feedback for precise clutch actuation and shifting. The Gear Actuator has two shift motors, two select solenoids, and four sensors to monitor each component. The TCM commands the servos to operate the clutch to launch the vehicle and shift. The Clutch Actuator has two electric servos with position sensors built into them. Both actuators are serviceable without removing the transmission. ![]() A Clutch Actuator and Gear Actuator control all necessary functions to operate the transmission. Unlike other DCTs, the Hyundai/ Kia units use electric servos, motors, and solenoids to control gear shifting and clutch operation. Power is transferred from the engine through a dry dual-clutch assembly coupled to a dual-mass flywheel. A stand-alone TCM sends signals to actuators on the transmission. It uses electric servos and motors as actuators to control clutch operation and transmission shifting. The DCT allows sequential gears to be pre-shifted while operating in another range. Note that these units have considerable internal ratio differences based on application. The D7GF1 unit is behind the smallest, low-torque engines, while the D7UF1 handles higher torque output motors (figures 1 and 2). The D7GF1 and D7UF1 are 7-speed, dual-clutch (DCT), automatically shifted manual transmissions manufactured by Hyundai Powertech, the powertrain division of Hyundai Motors. So, let’s familiarize ourselves with these transmissions so we can confidently approach them! Recently, these vehicles have been showing up at more aftermarket shops with concerns. Hyundai and Kia capitalized on the advantages of dual-clutch transmissions with their 7-speed applications, which have been in production for over ten years. ![]() Because of these attributes, they have found a home behind low torque and low horsepower engines. ![]() Also, adding a direct mechanical transfer of torque through gears produces the most efficient throughput of any transmission. The absence of a torque converter and an engine-driven oil pump significantly reduces horsepower consumption. Dual-clutch transmissions have become more prevalent in a quest to improve car fuel efficiency. ![]()
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