Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 372

Published: 11-May-2011

Automatic Transmission/Transaxle - Vehicles With: 6-Speed Automatic Transaxle -
AWF21 - Transmission DescriptionVehicles With: 6-Speed Automatic Transaxle -
AWF21

Description and Operation

COMPONENT LOCATION - AW F21 6 SPEED AUTOMATIC TRANSMISSION 2009MY

Item

Part Number

Description

1

-

Selector cable

2

-

Cable bracket

3

-

Transmission selector lever assembly

4

-

Transmission Control Module (TCM)

5

-

Lever arm

6

-

Automatic transmission

7

-

Transmission fluid cooler

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 unit. The transmission features lock-up slip control, 'Jaguar
Sequential Shift' functions and automatic and driver selectable modes to give the optimum performance.

The transmission is controlled by a

TCM (transmission control module)

which contains software to provide operation as a semi-automatic

'Jaguar Sequential Shift' transmission. The

TCM

allows the transmission to be operated as a conventional automatic unit by selecting P, R,

N, D on the selector lever. Movement of the selector lever across the gate to the 'M/S' position puts the transmission into electronic 'Sport'
mode. Further movement of the lever in a longitudinal direction to the + or – position puts the transmission into electronic manual 'Jaguar
Sequential Shift' mode.
For additional information, refer to:

External Controls - Vehicles W ith: 6-Speed Automatic Transaxle - AW F21

(307-05B Automatic

Transmission/Transaxle External Controls - Vehicles W ith: 6-Speed Automatic Transaxle - AWF21, Description and Operation).

The AW F21 transmission has the following features:

Designed to be maintenance free
Torque capacity of 450 Nm
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

via the high speed

CAN (controller area network)

bus.

TRANSMISSION

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

Item

Part Number

Description

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/filler plug is located in the bottom of the casing. The oil level is checked
by removing the inner fill plug when the transmission fluid is at a temperature of between 50 to 60°C (122 to 140°F). When the oil flow
becomes a drip from the plug hole, the level is correct.

The transmission has a fluid cooler which is located on the

LH (left-hand)

end of the engine cooling radiator. The cooler is connected to the

transmission converter housing by 2 pipes. The fluid cooler is connected into the engine cooling system and cools the transmission fluid by
heat transfer through the cooler to the engine coolant.

For additional information, refer to:

Transmission Cooling - Vehicles W ith: 6-Speed Automatic Transaxle - AW F21

(307-02B

Transmission/Transaxle Cooling - Vehicles W ith: 6-Speed Automatic Transaxle - AW F21, Description and Operation).

TORQUE CONVERTER

Item

Part Number

Description

1

-

Torque converter housing

2

-

Lock-up clutch

3

-

Turbine

4

-

Impeller

5

-

Stator

6

-

Fluid pump

7

-

Input shaft

The torque converter is the coupling element between the engine and the transmission and is located in the transmission housing, on the
engine side of the transmission. The driven power from the engine crankshaft is transmitted hydraulically and mechanically through the
torque converter to the transmission. The torque converter is connected to the engine by a drive plate.

The torque converter comprises an impeller, a stator and a turbine. The torque converter is a sealed unit with all components located
between the converter housing cover and the impeller. The two components are welded together to form a sealed, fluid filled housing. W ith
the impeller welded to the converter housing cover, the impeller is therefore driven at engine crankshaft speed.

The torque converter contains a hydraulically operated lock-up clutch which is controlled by the

TCM

via a solenoid in the valve block which

actuates spool valves to control the hydraulic pressure applied to the clutch. This allows the

TCM

to provide 3 modes of converter operation;

unlocked, partially locked and fully locked.

VALVE BLOCK

The valve block is located in a vertical position at the front of the transmission main casing, behind a sealed cover. The valve block contains
a number of solenoids, dampers and spool valves to control the transmission operation. The solenoids are controlled by the

TCM

to provide

gear changes and smooth transition between ratio changes.

Solenoids

Item

Part Number

Description

1

-

3-Way solenoid - S2

2

-

Shift control solenoid - SLC2

3

-

Shift control solenoid - SLC1

4

-

Valve block

5

-

Lock-up control solenoid - SLU

6

-

Shift control solenoid - SLC3

7

-

Shift control solenoid - SLB1

8

-

3-Way solenoid - S1

9

-

Line pressure control solenoid - SLT

Shift Control Solenoids - SLC1, SLC2, SLC3, SLB1

The shift control solenoids (SLC1, SLC2, SLC3 and SLB1) are installed on the front valve body. The solenoids respond to inputs from the

TCM

and control the hydraulic pressure applied to the clutches (C1, C2 and C3) and to the brake B1 to provide smooth shifting. The

TCM

uses a

single or a combination of these solenoids to provide shifts from 1st to 6th gear.

If a solenoid fails, the

TCM

will remove the current to the shift control solenoids and the transmission will use limp home mode, to prevent

damage to the transmission.

Line Pressure Control Solenoid - SLT

The line pressure control solenoid (SLT) is installed on the front valve body. The solenoid is controlled in a linear manner by the

TCM

which

uses throttle opening degree signals and engine torque information from the

ECM (engine control module)

to determine the solenoid

operation. The solenoid controls the line pressure applied to the clutches and brakes to provide smooth shifting.

If the solenoid fails, the

TCM

will remove the current supplied to the solenoid. Maximum line pressure will be applied to the clutches and

brakes unless the failure is due to the solenoid valve sticking, which may result in low line pressure.

Lock-Up Control Solenoid - SLU

The lock-up control solenoid is installed on the front valve body. The solenoid is controlled in a linear manner by the

TCM

which uses engine

speed, throttle opening degree signals and transmission speed sensor signals to determine the solenoid operation. The solenoid controls
the amount of lock-up or slip required for the torque converter lock-up clutch.

If the solenoid fails, the

TCM

removes the current supplied to the solenoid which results in no torque converter lock-up being applied.

3-W ay Solenoid - S1, S2

The 3-way solenoid (S1) is located on the center valve body and solenoid (S2) is located on the front valve body. The solenoids are on/off
solenoids controlled by the

TCM

. A combination of the 2 solenoids is used to operate either the 1st gear engine braking or enable gear

shifts.

If a solenoid fails, the

TCM

will remove the current supplied to both solenoids.

Speed Sensors