Range Rover Evoque: Transmission Description - Component Location
Component Location
COMPONENT LOCATION
- Auxiliary battery module
- Transmission Control Switch (TCS)
- Upshift (+) paddle switch
- Downshift (-) paddle switch
- Transmission and Gear Shift Module (GSM) breathers
- Automatic transmission
- Gear Shift Module (GSM)
- Transmission Control Module (TCM)
- Transmission fluid cooler (all markets)
- Transmission fluid cooler (hot climate markets)
Overview
OVERVIEW
The AW F21 automatic transmission is a 6 speed, electronically controlled unit manufactured by Aisin AW in Japan. The transmission represents the latest in automatic transmission technology for a transverse, AWD (all-wheel drive) unit. The transmission features lock-up slip control, 'CommandShift' functions and automatic and driver selectable modes to give the optimum on and off road performance.
The transmission is controlled by a TCM (transmission control module) which contains software to provide operation as a semi-automatic 'CommandShift' transmission and a Gear Shift Module (GSM). The GSM is a rotary actuator which converts driver selections for P, R, N, D and S on the rotary TCS (transmission control switch) into rotary movement of the transmission selector shaft allowing the system to operate as a 'shift by wire' system, with no mechanical link to the transmission for drive selections.
The TCM allows the transmission to be operated as a conventional automatic unit by selecting P, R, N, D, S on the TCS.
Rotation of the TCS to the 'S' position puts the transmission into electronic 'Sport' mode. Operation of the steering wheel mounted + or - paddle switches puts the transmission into electronic manual 'CommandShift' mode.
Refer to: External Controls (307-05 Automatic Transmission/Transaxle External Controls - Vehicles With: AWF21 6-Speed Automatic Transmission, Description and Operation).
The transmission system uses an auxiliary battery module which powers a failsafe system to allow the engagement of 'Park' in the event of vehicle power failure.
The AW F21 transmission has the following features:
- Designed to be maintenance free
- Transmission fluid is fill for life
- The torque converter features a controlled slip feature with electronically regulated lock-up control on gears 2 to 6
- Shift programs controlled by the TCM
- TCM has an adaptive capability to ensure efficient gear shift quality throughout the service life of the transmission
- Diagnostics available from the TCM and the GSM via the high speed CAN (controller area network) bus.
READ NEXT:
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)
Battery
Battery Junction Box (BJB)
Engine Control Module (ECM)
Centr
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
SEE MORE:
Electronic Engine Controls
Principles of Operation
For a detailed description of the 2.0L GTDi petrol electronic engine
controls, refer to the relevant Description and Operation
section in the workshop manual. REFER to: (303-14B Electronic Engine Controls -
GTDi 2.0L Petrol)
Inspection and Verification
CAUTION: Diagnosis by
Front Seat Backrest Cover
Removal
WARNINGS:
To avoid accidental deployment and possible personal injury, the backup
power supply must be depleted before
repairing or replacing any air bag supplemental restraint system (SRS)
components. To deplete the backup power supply
energy, disconnect the battery ground cable and wait
