2007 FORD FIESTA Workshop Manual

Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
Transmission
(AW81-40)
DESCRIPTION AND OPERATION
Clutches and brakes
/
Description The clutches are multi-plate clutches.
I 1 I I st - 3rd gear clutch I
1 2 14th gear brake I
1 3 1 Reverse gear clutch I
1 4 12nd - 4th gear brake I
1 6 1 3rdl4th gear clutch I
1 7 1 1st gear one-way clutch I
1 8 12nd gear one-way clutch I
The transmission is equipped with three clutches
and five brakes. The brakes
are three multi-plate brakes and two
one-way sprag clutches.
The clutches serve to transmit the torque from the
transmission input
shaft to certain components of
the planetary
gearset.
The brakes serve to hold certain components of
the planetary
gearset.
In order to achieve a given transmission ratio, it is
necessary for at least one component of the
planetary
gearset to be held while the torque is
transmitted to another component.
These combinations produce the different
transmission ratios for the individual gears.
2006.0 Fiesta 1212006 G380521 en
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Automatic Transmission/Transaxle -
Vehicles With: $-Speed Automatic
Transmission
(AW81-40)
DESCRIPTION AND OPERATION
Overview of operation
Item Descri~tion
I 1 I I st - 3rd gear clutch I
1 2 12nd gear one-way clutch I
1 3 12nd - 4th gear brake I
1 4 1 1st gear one-way clutch
1 5 1 Reverse gear brake I
1 6 13rd14th gear clutch
Item Description
1 8 1 Output wheel, planetary gearset
I
1 7 1 From the torque converter
1 9 ( Intermediate gear stage I
I
1 10 1 Differential assembly I
I A I Planetary gearset, rear I
11
12
I B I Planetary gearset, front I
4th gear brake
Reverse gear clutch
2006.0 Fiesta 1212006 ~380521 en
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
Transmission
(AW81-40)
DESCRIPTION AND OPERATION
i '
Intermediate gear stage and differential assembly
1 I
Component Connects
2006.0 Fiesta 1212006 G380521 en
3rdl4th gear clutch
Reverse gear clutch
2nd
- 4th gear brake
4th gear brake
Reverse gear brake
1st gear one-way clutch
2nd gear one-way clutch
* Only in selector lever position 2
** Only in selector lever position 1
Transmission input shaft to planet gear
carrier
Transmission input shaft to large sun gear
Transmission housing to large sun gear
Transmission housing to 2nd gear one-
way clutch
Transmission housing to planet gear
carrier
Transmission housing to planet gear
carrier
4th gear brake to large sun gear
X
X
X**
X X*
X X
XXX X
X
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -1 2 Transmission (AW81-40) 307-01 -1 2 --
DESCRIPTION AND OPERATION
Item Description The output wheel of the planetary gearset drives
I 1 I Output wheel, planetary gearset
2
I I 1
The annulus of the planetary gearset is fixedly Any differences in rotational speed between the
connected to the output
wheel of the planetary two halfshafts are compensated by the differential.
gearset.
the input wheel of the intermediate gear stage.
3
4
Main control body
Output wheel, intermediate gear stage
Item Descri~tion The hydraulic lines and pressures are electronically
The output
wheel of
the intermediate gear stage [<.
drives the spur gear of the differential assembly.
Differential assembly
Input wheel, intermediate gear stage The
differential assembly transmits the torque
via
the halfshafts to the front wheels.
In addition, the manual selector slide in the main
control body provides a hydraulic emergency
running programme which
allows the vehicle to be
Manual selector lever driven in 3rd aear with the selector lever in position
.
1
Shift timing solenoid valve
5
2006.0 Fiesta 1212006 ~380521 en
regulated by a proportional solenoid valve (main
regulating valve) and four shift solenoid valves.
1 6 1 SSA shift solenoid valve
SSB
shift solenoid valve
transmission control unit-fail. -
"D", "2" or "ll'and in reverse gear with the selector
lever in position "R if key components or the
The hydraulic pressure is distributed to the The
manual selector slide is actuated by the driver
individual clutches and brakes in the main control via the selector lever, the selector lever cable, the
body. selector shaft lever and the internal gearshift
mechanism.
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -1 3 Transmission (AW81-40) 307-01 -1 3
DESCRIPTION AND OPERATION
Internal gearshift mechanism
Item Description The movement is then transferred via the selector
1
2
I I I The cone displaces the parking pawl when the
The mechanical parking lock secures the vehicle
selector lever position wPw is against rolling away.
The parking pawl engages in the teeth on the
When the vehicle is stationary it is engaged purely
output wheel of the planetary gearset. mechanically via the selector lever when the
selector lever position "P" is engaged. Accordingly,
the differential is blocked via the
intermediate shaft, and the vehicle is secured and
The movement of the selector lever is transmitted
cannot roll away. via the selector lever cable to the selector shaft Stepped cam
with actuating lever for the
3
4
lever. Selector
shaft
2006.0 Fiesta 1212006 G380521 en
shaft to the stepped cam.
forms part of the stepped cam, and it is used to
actuate the manual selector slide in the main
Actuating rod for the parking pawl with cone
Parking pawl
manual
selector slide
control body.
The actuating rod for the parking pawl with cone
is hooked into the stepped cam.
The actuating lever for
the manual selector slide
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
Transmission
(AW81-40)
DESCRIPTION AND OPERATION
Fluid circuit
Item Description
I 1 I Transmission control unit
1 2 1 Solenoid valves and main control body I
1 3 I Clutches and brakes I
1 4 1 Planetary gearset
1 5 1 Fluid pump I
1 6 1Oil pan I
1 7 1 Fluid cooler I
Item Description
1 8 I Torque converter I
I A I Electric actuation of the solenoid valves I
B Actuating pressure of the clutches and
1 lbrakes
I C ITo the oil pan I
I D I From the oil pan I
I E I Fluid pump pressure I
2006.0 Fiesta 121~006 ~380521 en
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
Transmission
(AW81-40)
DESCRIPTION AND OPERATION
Item Description
I H I To the fluid cooler I
, i
2006.0 Fiesta 1212006 G380521 en
F
G
Lubrication
To the torque converter
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Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -1 6 Transmission (AW81-40) 307-01 -1 6
DESCRIPTION AND OPERATION
Identification Tags
'.. Type plate
Item Description In addition, the serial number is also stamped on
I 1 I Ford part number the transmission housing.
2
2006.0 Fiesta 1212006 G380522en
3 1 Stamped serial number
Serial number G: Month
of manufacture: July
Serial number (example:
03GS112345)
03: Year
of manufacture 2003
The serial number and the Ford part number are
' S: Model code for 80-series
shown on a sticker on the transmission housing.
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