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This test not only verifies the diagnosis but also examines other defects of the TCU. Before repairing a TCU, its known weak elements go through a comprehensive test. Remanufacturing: the processīefore we tell you about repairing, we’ll start at the beginning: the entry test. This is because Y3/8N4 stands for the ceramic circuit board and once its components are defective, it is not viable to remanufacture the TCU from an economic point of view. Unfortunately, we do not repair such TCUs and we recommend not sending it to us. Once in a while, there are defective TCUs with error codes regarding Y3/8N4. Such fillings might seriously disrupt the functioning of the speed sensors. Extra diagnostic tip:Ĭheck if there are iron fillings on the sensor rings in the gearbox. In some cases the defect is related to mechanic parts, but it might as well be located in the TCU. However, always try to ensure making a good diagnosis. These defects are not only recognisable by error codes, because you’ll always notice that the gearbox does not function like it should: it keeps changing gears, the clutch is sliding and the complete failure of the drive… so many things can go wrong. P2716 – Pressure Control Solenoid “D” Electrical P0705 – Transmission Range Sensor Circuit Malfunction P0723 – Output Speed Sensor (VGS) is defective Other internal speed sensor error codes: P2204, P2205, P2206, P2207. P2768 – Component Y3/8n2 (Internal speed sensor (VGS)) is defective P2767 – The signal from component Y3/8n2 (Internal speed sensor (VGS)) in not available P2201 – Component Y3/8n2 (Internal speed sensor (VGS)) is defective P2200 – The signal from component Y3/8n2 (Internal speed sensor (VGS)) in not available P0718 – Component Y3/8n1 (Turbine speed sensor (VGS)) is defective P0717 – The signal from component Y3/8n1 (Turbine speed sensor (VGS)) is not available Each sensor has its own specific error codes: Y3/8N1 – Turbine speed sensor
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These do not only concern speed sensors Y3/8N1, Y3/8N2 and Y3/8N3, but also transmission range sensor Y3/8S1. There are many complaints about this TCU, most of them regarding the various TCU sensors of the 7G-Tronic. Therefore we’ll only discuss the TCU and not the mechanical part of the mechatronics. ACtronics only developed a remanufacturing solution for the TCU, since almost all defects are related to the TCU. Mechatronics are made up of mechanics (in this case the actuators and the labyrinth) and electronics (the sensors and the brain: together the TCU). It is important to know that the TCU is part of the mechatronics of this gearbox. That’s why we call it a Continental 7G-Tronic (722.9) TCU in this article. In this article we won’t discuss the entire gearbox, but merely the electronics that control the gearbox. However, knowing that Mercedes-Benz developed and introduced the 7G-tronic by itself, why was the name Continental used? Continental is the name of the manufacturer that produced the TCU for the 7G-Tronic.