Introducing the New Aisin-Warner 6-Speed

FUN WITH TRANSMISSIONS

Introducing the
NEW Aisin-Warner by Bill Brayton

6-Speed
F
ord has a new front wheel drive:
the AWF-21. It’s a real gas sav-
ing 6-speed transmission. With
gas prices climbing astronomically
around the country, that’s an important
consideration.
In this edition of Fun with
Transmissions, we’ll be looking at the
AWF-21. This transmission is built in
Japan by Aisin-Warner for Ford Motor
Company (figure 1A, 1B). Ford uses
the AWF-21 in the Montego, Fusion,
Freestyle, Five Hundred, Zephyr and
Milan. It’s also used, in different con-
figurations, by Volkswagen (09G),
Mini Cooper (Aisin TF-60SN) Mazda
(AW6A-EL) and Volvo (TF-80SC).
To get six speeds, this transmis-
sion uses the Lepelletier geartrain. The
Lepelletier geartrain can be identified
by the stationary sun gear in the input
planetary gearset (figure 2). Because
the front planetary gearset is always Figure 1A
rotating around the stationary sun gear,
this type of transmission never achieves
a 1:1 gear ratio (figure 3). This is the
same geartrain used in Ford’s 6R60 rear
wheel drive transmission.

Figure 1B

Figure 2

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 Figure 3 Figure 4

Figure 5

The look of the clutch and band those old Ford names, identifying
application chart is also a departure for these clutches as C1, C2 and C3.
Ford. In the past, Ford has used terms As with all Aisin-manufac-
such as forward clutch and intermediate tured transmissions, any band or
band. The AWF-21 moves away from clutch pack that locks a spinning
component to the case, such
as a planetary gearset, is called
a brake (B). The AWF-21 has
two brakes: The B1 brake is a
band which applies in 2nd and
6th gears. The B2 brake is a Figure 6
clutch pack splined to the case. lever position switch (MLPS), but it’s
The B2 clutch applies in reverse actually the transmission controller.
and provides engine braking in The vehicle’s harness plugs into the
manual low (figure 4). connector and the TCM plugs into the
The transmission control mod- transmission (figure 5).
ule (TCM) is easy to find on this You’ll need an up-to-date scan tool
transmission. It looks like a manual with CAN BUS capability to diagnose
this unit. There are only a few wires
on the case connector (figure 6). You
can remove the TCM and check sole-
noid, speed sensor and transmission
temperature sensor circuits’ continu-
ity when needed (figure 7). The TCM
should be reprogrammed with the lat-
est calibrations from the factory web
site — www.motorcraftservice.com —
Figure 7 during every rebuild.

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Introducing the New Aisin-Warner 6-Speed

Figure 9

Figure 8

Most Ford-produced transmissions only have a

tap for checking line pressure, and maybe a tap for
EPC pressure. Because the AWF-21 is an Aisin trans-
mission, this unit has several taps for Figure 10
checking clutch apply pressures (figures
8 and 9). Keep in mind these are mini-
mum and maximum pressure specifica-
tions. This will make it easier to diag-
nose shift problems (figure 10).

Valve Body
The AWF-21 has a complicated
valve body. It has lots of little parts
that are going to get lost if you aren’t
extremely careful. The pictures included
here are the first to be published. Ford
Motor Company hasn’t produced pic-
tures of this valve body, and hasn’t
named the valves at the time of this writ-
ing (figures 11-17).
Figure 11

Figure 12 Figure 13

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Introducing the New Aisin-Warner 6-Speed

Figure 14

Figure 15

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 Figure 16

When you remove the bracket for the speed

sensors during the valve body R&R, it exposes a pin
that retains a solenoid to the valve body (figure 18).
Be very careful turning the valve body over: This
pin will surely drop out and get lost! If that happens,
the measurements for all solenoid retaining pins are
0.118” x 0.932”.
There are no checkballs in this unit; instead, it
uses relief valves that do the same thing as checkballs
(figure 19).
Ford is using the AWF-21 in six late-model
vehicles, in part due to its gas mileage benefits. And
as the price at the pump continues to climb, look for
the Aisin-Warner six-speed to become a very popular
transmission in all its variations over the coming
years.

Figure 17

When you remove

the bracket for the
speed sensors during
the valve body R&R,
it exposes a pin that
retains a solenoid to
the valve body.

Figure 18 Figure 19

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