Range Rover Evoque: Transmission Description - System Operation and Component Description

Control Diagram

NOTE: A = Hardwired; D = High Speed Controller Area Network (CAN) bus; O = Local Interconnect Network ( LIN)

Range Rover Evoque. Automatic Transmission/Transaxle - Vehicles With: AWF21 6-Speed Automatic Transmission

  1. Battery
  2. Battery Junction Box (BJB)
  3. Engine Control Module (ECM)
  4. Central Junction Box (CJB)
  5. Transmission paddle switches
  6. Clockspring
  7. Auxiliary battery module
  8. Transmission Control Switch (TCS)
  9. Transmission Control Module (TCM)
  10. Gear Shift Module (GSM)

System Operation

OPERATION

Operation of the transmission is controlled by the TCM (transmission control module), which electrically activates various solenoids to control the transmission gear selection. The sequence of solenoid activation is based on programmed information in the TCM memory and physical transmission operating conditions such as vehicle speed, throttle position, engine load and rotary TCS (transmission control switch) position.

Engine torque is transferred, via operation of single or combinations of clutches to the planetary gear trains. The gear trains are controlled by reactionary inputs from brake clutches to produce the 6 forward gears and 1 reverse gear.

The shift elements (clutches and brakes) are actuated hydraulically. Fluid pressure is applied to the required clutch and/or brake, pressing the plates together and allowing drive to be transmitted through the plates. The purpose of the shift elements is to perform power-on shifts with no interruption to traction and smooth transition between gear ratios.

Component Description

DESCRIPTION

The transmission comprises the main casing which houses all of the transmission components. The torque converter is located in a separate converter housing.

AW F21 Automatic Transmission - Sectional View

  1. Clutch - C2
  2. Brake - B2
  3. One-way clutch - F1
  4. Clutch - C1
  5. Brake - B1
  6. Clutch - C3
  7. Torque converter
  8. Fluid pump
  9. Differential assembly
  10. Counter driven gear
  11. Counter drive gear

The main casing retains the fluid at the bottom. A combined drain/level plug is located in the bottom of the casing. The oil level is checked by removal of the inner level plug, with the engine running and the transmission fluid at a temperature of between 50 to 60

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 Torque Converter, Valve Block

TORQUE CONVERTER Torque converter housing Lock-up clutch Turbine Impeller Stator Fluid pump Input shaft The torque converter is the coupling element between the engine and the transmission

 Drive Clutches, Planetary Gear Train

DRIVE CLUTCHES Multiplate Drive or Brake Clutch - Typical Input shaft Main pressure supply port Piston Cylinder - External plate carrier Clutch plate assembly Baffle plate Diaphragm spring O

 Power Flows

Operation of the transmission is controlled by the TCM which electrically activates various solenoids to control the transmission gear selection. The sequence of solenoid activation is based on prog

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 Steering column lock

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