Shift Solenoids (SSA, SSB, SSC) Three ON/OFF solenoids are used for electronic shift scheduling. The three solenoids are located in the main control valve body (7A100). The solenoids are two-way, normally open style. Solenoids SSA, SSB, and SSC provide selection of first through fourth gear by controlling the pressure of the three shift valves. Transmission Fluid Temperature (TFT) Sensor This sensor is located on the transaxle main control body. It is a temperature-sensitive device called a thermistor. The resistance value of the TFT will vary with temperature change. The PCM monitors the voltage across the TFT to determine the temperature of the transmission fluid. The PCM uses this initial signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows quicker shifts when the transmission fluid temperature is cold. The PCM also inhibits torque converter clutch operation at low transmission fluid temperatures. Corrects EPC pressures for temperature. Electronic Pressure Control (EPC) Solenoid This solenoid is a variable force style (VFS) solenoid. The VFS-type solenoid is an electro-hydraulic actuator combining a solenoid and a regulating valve. It supplies EPC which regulates transaxle line pressure and line modulator pressure. This is done by producing resisting forces to the main regulator and line modulator circuits. These two pressures control clutch application pressures. Torque Converter Clutch (TCC) Solenoid This solenoid is used in the transaxle control system to control the application, modulation and release of the torque converter clutch. Solenoids are inside on valve body, remove pan for access.
Saturday, January 16th, 2010 AT 1:24 PM