TRANSMISSION 12 The transmission electrical connector is an important part of the transmission operating system. Any interference with the electrical connection can cause the transmission to set diagnostic trouble codes or affect proper operation. Internal Mode Switch (IMS): The transmission manual shift shaft position, given by the Internal Mode Switch (IMS), is a sliding contact switch that connects to the manual valve located inside the mechatronic. The four inputs to the TCM from the position switch assembly indicate which transmission gear range (PRND) is selected. Note: This is for information only. Disassembly of this component is not allowed. Input & Output Speed Sensors: The Input and Output Speed Sensor (ISS & OSS) are hall-effect type sensors. They both connect to the TEHCM through a wire harness and connector. These signals are used to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ration addition to the CAN bus data Note: This is for information only. Disassembly of this component is not allowed. Transmission Fluid Temperature (TFT) Sensor: The Transmission Fluid Temperature (TFT) sensor is located in TEHCM. The TFT is a thermistor, which changes value based on transmission oil temperature. Shift Scheduling The Controller Area Network (CAN) was created in order to increase communication reliability, rapidity, capacity and flexibility between the electronic systems of the vehicle and to create a database to avoid information transmission failures. Clutch-to-Clutch transmission technology performs gear shifts by simultaneously applying one clutch while releasing another. A precise timing is required to ensure optimal shift quality. Direct Pressure Control of Clutch to Clutch: Two pressure commands are required to make a shift, one to control the oncoming clutch, one to control the off going clutch. A Variable Bleed Solenoid (VBS) is used to directly generate each pressure command which acts on a control valve to regulate the pressure delivered to the clutch. Shift valves can be used to multiplex the clutches on which the regulator valves act and to give failure mode protection. Terminology: Oncoming clutch: The clutch being applied during a shift. If two are to be applied, one is selected as the Primary and one as the Secondary. Off going clutch: The clutch being released during the shift. Common or Holding clutch: This is the clutch that remains applied during a shift. Under lap: When the Off going clutch is released before the oncoming clutch has capacity. In power on conditions this often known as Flare. Overlap: When the oncoming and Off going both have capacity at the same time, also known as Tie-Up. Towing recommendation: Vehicle recovery towing requirement, Vehicle to
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