Transmission Oil Pan. . . . . . . . . . . . . . . . . . . . . . . .181 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 Shift Valve Control Devices . . . . . . . . . . . . . . . . . . .195 Th rottle 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 Transaxle Designs. . . . . . . . . . . . . . . . . . . . . . . . . .208 Automatic Transaxle Case | Transaxle Oil Pans | Th ermostatic Elements | Torque Converter | Magnetic Powder Clutch | Transaxle Shaft s | Chain Drives | Planetary Gearsets | Parallel Shaft Gearsets | Holding Members | Final Drive Units | Diff erential 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 First Gear | Second Gear | Th ird Gear | Fourth Gear | Reverse All Clutch Transaxle. . . . . . . . . . . . . . . . . . . . . . . . .229 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, Th ird Gear | Drive, Th ird Gear— Converter Clutch Apply | Drive, Fourth Gear (Overdrive) | Part Th rottle Downshift to Th ird | Detent Downshift (Passing Gear) | Manual Th ird | Manual Second | Manual First | Reverse Transaxle Hydraulic System Operation . . . . . . . . . . .258 Overdrive—First Gear | Overdrive— Second Gear | Overdrive—Th ird 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 Th ree Shift Solenoids Partial Electronic Shift Controls . . . . . . . . . . . . . . . .298 CVT Pulley Controls. . . . . . . . . . . . . . . . . . . . . . . . .302 Manual Shifting Programs. . . . . . . . . . . . . . . . . . . .303 Chapter 13 Troubleshooting Mechanical, Hydraulic, and Electrical Problems. . . . 309 The Seven-Step Troubleshooting Process . . . . . . . . .310 Step 1—Determine the Exact Nature of the Complaint | Step 2—Check for Obvious Causes | Step 3—Determine Which Component or System Is the Most Probable Cause of the Problem | Step 4—Perform Pinpoint Tests | Step 5— Check for Related Problems | Step 6— Correct the Defect | Step 7—Recheck System Operation | Th e Importance of Follow-Up 8 Automatic Transmissions and Transaxles