Solenoid/Clutch Application

Figure 5 shows the solenoid/clutch logic for each gear. The "*" symbol indicates that a solenoid is active or being regulated in the case of pressure regulating solenoids. The "-" symbol indicates that a solenoid is inactive, but does not differentiate between inactive on or inactive off. A further explanation of this situation will be made using the application of the torque converter clutch for example.

The pressure regulating solenoid (EDS) number 4 is used to apply the torque converter clutch in 4th and 5th gears. The sequence of symbols in the gear logic chart shows "-*-". The sequence of symbols represents the actions taking place. The first "-" represents the torque converter clutch open, EDS 4 inactive. The "*" represents EDS 4 under regulation, or active, to engage the converter clutch. The last "-" represents EDS 4 inactive, torque converter clutch closed. There is a voltage difference between inactive, torque converter open (approximately 1 VDC) and inactive, torque converter clutch closed (approximately 5 VDC).

EDS 1 regulates transmission mainline pressure and delivers maximum pressure with minimum current and minimum pressure with maximum current. EDS 2, 3, 4, and 5 regulate clutch application and release pressures and deliver maximum pressure with maximum current and minimum pressure with minimum current.