Chapter 9
Automatic Transmission Control
Components . . . . . . . . . . . . . . . . . . . . . 185
Control System Overview 186
Transmission Oil Pump 186
Transmission Oil Filter 189
Transmission Oil Cooler 189
Main Oil Cooler / Auxiliary Oil Cooler
Valve Body 189
Oil Transfer Tubes
Hydraulic Valves 190
Pressure Regulator Valve / Manual Valve / Shift
Valves / Throttle Valve / Governor Valve / Detent
Valve / Check Valves
Accumulators 198
Automatic Transmission Shift Linkage 198
Selector Lever / Shift Linkage / Neutral Start Switch /
Parking Gear / Shift-Brake Interlocks
Electrical Components 202
Switches / Solenoids
Chapter 10
Automatic Transaxle Construction and
Operation . . . . . . . . . . . . . . . . . . . . . . . 207
Transaxle Construction and Basic Operation 208
Automatic Transaxle Case / Transaxle Oil Pans /
Thermostatic Elements / Torque Converter /
Magnetic Powder Clutch / Transaxle Shafts / Input
Shafts / Output Shafts / Oil Pump Shaft / Stator Shaft /
Transfer Shaft / Chain Drives / Planetary Gearsets /
Parallel Shaft Gearsets / Holding Members / Final
Drive Units / Differential Assembly / Final Drive
Lubrication / Transaxle Oil Pump / Transaxle Oil
Filter / Transaxle Oil Cooler / Valve Body /
Automatic Transaxle Shift Linkage / Electronic
Components
Automatic Transaxle Power Flow 223
Power Flow Diagrams 224
All Clutch Transaxle 230
Continuously Variable Transaxle 230
Rear-Wheel Drive Transaxles 232
Chapter 11
Transmission and Transaxle Circuits . . . 235
Basic Hydraulic Circuit Operation 236
Simple Automatic Transmission / 3-Speed Automatic
Transmission
Transmission and Transaxle Oil Circuits 240
Transmission Hydraulic System Operation 241
Park, Engine Running / Neutral, Engine Running /
Drive, First Gear / Drive, Second Gear / Drive,
Third Gear / Drive, Third Gear – Converter Clutch
Apply / Drive, Fourth Gear (Overdrive) / Part
Throttle Downshift to Third / Detent Downshift
(Passing Gear) / Manual Third / Manual Second /
Manual First / Reverse
Transaxle Hydraulic System Operation 258
Overdrive—First Gear / Overdrive—Second Gear /
Overdrive—Third Gear / Converter Clutch Apply /
Overdrive—Fourth Gear / Reverse
Chapter 12
Electronic Control Systems . . . . . . . . . . 267
Development of Electronic Controls 268
Electronic versus Hydraulic Controls 268
Electronic Control System Components 268
Input Sensors / ECM / Output Solenoids / Governor
Pressure Solenoids
Electronic Transmission and Transaxle
Operation 281
Sensor Inputs and Computer Operation / Electronic
Transmission with Two Shift Solenoids / Electronic
Transaxle with Three Shift Solenoids
Partial Electronic Shift Controls 298
CVT Pulley Controls 302
Manual Shifting Programs 303
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