Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
Transmission (AW81-40)
DESCRIPTION AND OPERATION
Item Description
1 5 1 Generic Electronic Module (GEM) I
I
1 6 1 Turbine Shaft Speed (TSS) sensor I
1 7 1 Output Shaft Speed (OSS) sensor I
1
2
3
4
l tem Description
Transmission control unit
Data Link Connector (DLC)
Powertrain Control Module (PCM)
Instrument cluster
1 8 I Transmission Range (TR) sensor I
1 9 1 Starter inhibit relay I
1 10 1 Backup lamp relay I
11 Transmission Fluid Temperature (TFT)
I I sensor
1 12 loverdrive switch I
1 13 1 Driver's side door ajar switch I
1 14 1 Solenoid valves in the main control body 1
Transmission control unit
Item Description
Electrical connector, vehicle wiring
harness
connector, transmission wiring
harness
--
The transmission control unit is located in the
'engine compartment on the left-hand side member.
The transmission control unit evaluates incoming
signals and controls the actuators accordingly.
2006.0 Fiesta 1212006 G380530en
procarmanuals.com
Automatic Transmission/Transaxle -
Vehicles With: 4-Speed Automatic
307-01 -40 Transmission (AW81-40)
307-01 -40
DESCRIPTION AND
OPEMION
Driver's side door ajar switch
The door ajar switch is located in the door lock on
the driver's side.
When the door is closed a ground connection is
signalled to the transmission control unit.
When the door is opened this ground connection
is interrupted.
The transmission control unit uses the signal from
the driver's side door ajar switch to warn the driver
if the selector lever is not in position
"P" and the
driver's door is open.
In this case the transmission control unit transmits
the warning tone request via the CAN
databus to
the instrument cluster.
The instrument cluster passes this request on to
the GEM, which then generates a warning tone.
Consequences of signal failure:
no warning tone request.
Actuators
Main regulating valve
Item Description
I 1 I Main regulating valve I
The main regulating valve is a proportional valve
which converts the applied electric current into a
proportional hydraulic pressure.
The currentless state corresponds to maximum
pressure.
/
The main regulating valve is used to determine the
main line pressure and therefore the actuating
pressure for the clutches and brakes.
Consequences of signal failure:
hydraulic emergency running mode.
SSA and SSB shift solenoid valves
Item Description
2006.0 Fiesta 1212006 G380530en
1
2
SSA
SSB
(- t..
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