Automatic Transmission - 4T45-E - Description And Operation

• Description and Operation
  • Transmission General Information
    • How to Use This Section
    • Basic Knowledge
  • Definitions and Abbreviations
    • Throttle Positions
    • Shift Condition Definitions
    • Noise Conditions
    • Transmission Abbreviations
  • Transmission Identification Information
  • Transmission General Description
  • Transmission Component and System Description
  • Transmission Adaptive Functions
  • Electronic Component Description
    • Transmission Control Module
    • Torque Converter Clutch Pulse Width Modulated Solenoid Valve
    • Automatic Transmission Pressure Control Solenoid Valve
    • Shift Solenoid Valves: 1-2 and 2-3
    • Automatic Transmission Fluid Pressure Manual Valve Position Switch Assembly
    • Output Speed Sensor (OSS)
    • Input Speed Sensor (ISS)
    • Automatic Transmission Fluid Temperature Sensor
    • Park/Neutral Position Switch
    • Floor Shift Control, Some Models
  • Automatic Transmission Hydraulic Diagrams
    • Park - Engine Running (W/O Electronic Range Select Mode)
      • Notes
      • Pressure Regulation
        • Pressure Regulator Valve
        • Actuator Feed Limit (AFL) Valve
        • Pressure Control Solenoid (PCS) Valve
        • Torque Signal Regulating Valve
      • Low and Reverse Band Applies
        • Manual Valve
        • Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
        • 3-4 Shift Valve
        • Lube 2
      • Shift Accumulation
        • 1-2/3-4 Accumulator Valves
        • 1-2, and 3-4 Accumulator Assemblies
      • Torque Converter/Cooler and Lube Circuits
      • Park - Engine Running - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Park - Engine Running (With Electronic Range Select Mode)
      • Notes
      • Pressure Regulation
        • Pressure Regulator Valve
        • Actuator Feed Limit (AFL) Valve
        • Pressure Control Solenoid (PCS) Valve
        • Torque Signal Regulating Valve
      • Low and Reverse Band Applies
        • Manual Valve
        • Automatic Transmission Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
        • 3-4 Shift Valve
        • Lube 2
      • Shift Accumulation
        • 1-2/3-4 Accumulator Valves
        • 1-2, and 3-4 Accumulator Assemblies
      • Torque Converter
      • Cooler and Lube
        • Lube 1
        • Lube 2
      • Park - Engine Running - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Reverse (W/O Electronic Range Select Mode)
      • Notes
      • Pressure Regulation
        • Manual Valve
        • Pressure Regulator and Boost Valves
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Reverse Clutch Applies
        • Reverse Clutch
      • Low and Reverse Band Remains Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
      • Torque Converter Clutch
        • Pressure Regulator (PR) Valve
        • TCC Feed Limit Valve
        • TCC Regulated Apply Valve
        • TCC Control Valve
        • Torque Converter
      • Cooler and Lube
        • Lube 1
        • Lube 2
      • Reverse - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Reverse (With Electronic Range Select Mode)
      • Notes
      • Pressure Regulation
        • Manual Valve
        • Pressure Regulator and Boost Valves
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Reverse Clutch Applies
        • Reverse Clutch
      • Low and Reverse Band Remains Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
      • Torque Converter Clutch
        • Pressure Regulator (PR) Valve
        • TCC Feed Limit Valve
        • TCC Regulated Apply Valve
        • TCC Control Valve
        • Torque Converter
      • Cooler and Lube
        • Lube 1
        • Lube 2
      • Reverse - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Neutral - Engine Running (W/O Electronic Range Select Mode)
      • Notes
      • Reverse Clutch Releases
        • Manual Valve
        • Reverse Clutch
        • Boost Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Low and Reverse Band Remains Applied
        • Notes
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
      • Neutral - Engine Running - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Neutral - Engine Running (With Electronic Range Select Mode)
      • Notes
      • Reverse Clutch Releases
        • Manual Valve
        • Reverse Clutch
        • Boost Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Low and Reverse Band Remains Applied
        • Notes
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • Low and Reverse Servo
      • Neutral - Engine Running - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, First Gear (W/O Electronic Range Select Mode)
      • Notes
      • Manual Valve
      • Low and Reverse Band Releases
        • Low and Reverse Servo
      • Forward Clutch Applies
        • Forward Clutch
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, First Gear - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, First Gear (With Electronic Range Select Mode)
      • Notes
      • Manual Valve
      • Low and Reverse Band Releases
        • Low and Reverse Servo
      • Forward Clutch Applies
        • Forward Clutch
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, First Gear - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Second Gear (W/O Electronic Range Select Mode)
      • Notes
      • Second Clutch Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • #2 Checkball (Second Clutch Apply)
        • Second Clutch
      • Shift Accumulation
        • 1-2 Accumulator
        • 1-2 Accumulator Valve
        • TCC Control - Pulse Width Modulated (PWM) Solenoid Valve
        • Torque Converter Clutch
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
      • Overdrive Range, Second Gear - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Second Gear (With Electronic Range Select Mode)
      • Notes
      • Second Clutch Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • #2 Checkball (Second Clutch Apply)
        • Second Clutch
      • Shift Accumulation
        • 1-2 Accumulator
        • 1-2 Accumulator Valve
        • TCC Control - Pulse Width Modulated (PWM) Solenoid Valve
        • Torque Converter Clutch
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
      • Overdrive Range, Second Gear - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Third Gear - Torque Converter Clutch Not Applied (W/O Electronic Range Select Mode)
      • Notes
      • Direct Clutch Applies
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
        • #5 Checkball (Direct Clutch Apply)
        • Direct Clutch
        • 3-4 Shift Valve
      • Shift Accumulation
        • 2-3 Accumulator
        • Torque Converter Clutch (TCC)
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, Third Gear - TCC Not Applied - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Third Gear - Torque Converter Clutch Not Applied (With Electronic Range Select Mode)
      • Notes
      • Direct Clutch Applies
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
        • #5 Checkball (Direct Clutch Apply)
        • Direct Clutch
        • 3-4 Shift Valve
      • Shift Accumulation
        • 2-3 Accumulator
        • Torque Converter Clutch (TCC)
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, Third Gear - TCC Not Applied - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Fourth Gear - Torque Converter Clutch Applied (W/O Electronic Range Select Mode)
      • Notes
      • Intermediate and Fourth Band Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • 3-4 Shift Valve
        • Intermediate and Fourth Servo
      • Shift Accumulation
        • 3-4 Accumulator
        • 3-4 Accumulator Valve
      • Torque Converter Clutch Applied
        • TCC Control Solenoid Valve
        • TCC Regulated Apply Valve
        • TCC Control Valve
        • Torque Converter Clutch (TCC)
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, Fourth Gear - TCC Applied - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, Fourth Gear - Torque Converter Clutch Applied (With Electronic Range Select Mode)
      • Notes
      • Intermediate and Fourth Band Applied
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
        • 3-4 Shift Valve
        • Intermediate and Fourth Servo
      • Shift Accumulation
        • 3-4 Accumulator
        • 3-4 Accumulator Valve
      • Torque Converter Clutch Applied
        • TCC Control Solenoid Valve
        • TCC Regulated Apply Valve
        • TCC Control Valve
        • Torque Converter Clutch (TCC)
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Overdrive Range, Fourth Gear - TCC Applied - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Overdrive Range, 4-3 Downshift - Torque Converter Clutch Not Applied (W/O Electronic Range Select Mode)
      • Notes
      • Line Pressure Increases
        • Pressure Control Solenoid (PCS) Valve
        • Pressure Regulator Valve
      • Intermediate and Fourth Band Releases
        • 1-2 Shift Solenoid Valve
        • 3-4 Shift Valve
        • Intermediate and Fourth Servo
        • 3-4 Accumulator
        • 1-2/3-4 Accumulator Valve
      • Torque Converter Clutch
      • Overdrive Range, 4-3 Downshift - TCC Not Applied - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Drive Range, Manual Third (from Overdrive Range) (W/O Electronic Range Select Mode)
      • Notes
      • Fourth Gear Hydraulically Prevented
        • Manual Valve
        • 3-4 Shift Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Manual Third - Second and First Gears
      • Drive Range, Manual 3rd (from Overdrive Range) - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Manual Third Gear (With Electronic Range Select Mode)
      • Notes
      • Fourth Gear Hydraulically Prevented
        • Manual Valve
        • 3-4 Shift Valve
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
      • Manual Third - Second and First Gears
      • Manual Range 3rd - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Drive Range, Manual Second (from Drive, Manual Third) (W/O Electronic Range Select Mode)
      • Notes
      • Manual Valve
        • Notes
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
      • Direct Clutch Releases
        • Direct Clutch
        • #6 Checkball (Direct Clutch Release)
        • 2-3 Accumulator
      • Intermediate and Fourth Band Applies
        • 1-2 Shift Valve
        • #3 Checkball (Intermediate Band Apply)
        • Intermediate and Fourth Servo
      • Pressure Control
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • Pressure Control Solenoid Valve
        • Torque Converter Clutch
      • Drive Range, Manual 2nd (from Drive, Manual 3rd) - Without Electronic Range Select Modeh - A/T System Hydraulic Diagram
    • Manual Second Gear (With Electronic Range Select Mode)
      • Notes
      • Manual Valve
        • Notes
        • 2-3 Shift Solenoid Valve
        • 2-3 Shift Valve
      • Direct Clutch Releases
        • Direct Clutch
        • #6 Checkball (Direct Clutch Release)
        • 2-3 Accumulator
      • Intermediate and Fourth Band Applies
        • 1-2 Shift Valve
        • #3 Checkball (Intermediate Band Apply)
        • Intermediate and Fourth Servo
      • Pressure Control
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • Pressure Control Solenoid Valve
        • Torque Converter Clutch
      • Manual Range 2nd - With Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Drive Range, Manual First (from Drive, Manual Second) (W/O Electronic Range Select Mode)
      • Notes
      • Manual Valve
        • Notes
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • #1 Checkball (Low/PRN)
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
      • Second Clutch Releases
        • Second Clutch
        • 1-2 Accumulator
        • 1-2/3-4 Accumulator Valve
        • TCC Control Solenoid Valve
      • Intermediate Band Releases
        • Intermediate and Fourth Servo
      • Low and Reverse Band Applies
        • Low and Reverse Servo
      • Drive Range, Manual 1st (from Drive, Manual 2nd) - Without Electronic Range Select Mode - A/T System Hydraulic Diagram
    • Manual First Gear (With Electronic Range Select Mode)
      • Notes
      • Manual Valve
        • Notes
        • A/T Fluid Pressure Manual Valve Position Switch (TFP Val. Position Sw.) Assembly
        • #1 Checkball (Low/PRN)
        • 1-2 Shift Solenoid Valve
        • 1-2 Shift Valve
      • Second Clutch Releases
        • Second Clutch
        • 1-2 Accumulator
        • 1-2/3-4 Accumulator Valve
        • TCC Control Solenoid Valve
      • Intermediate Band Releases
        • Intermediate and Fourth Servo
      • Low and Reverse Band Applies
        • Low and Reverse Servo
      • Manual Range 1st - With Electronic Range Select Mode - A/T System Hydraulic Diagram
  • Fluid Passages