TK 56433-5-MM-EN
79
and reconnect the wires.
3.
Pressurize the low side and check for leaks. If no
leaks are found, evacuate the low side.
4.
Open the refrigeration valves and place the unit in
operation.
Electronic Throttling Valve (ETV)
Removal
1. Pump down the low side and equalize the pressure
to slightly positive.
2. The ETV must be open to remove the stepper motor
and piston assembly. Open the ETV by placing the
unit in the Evacuation Mode/Test, and
disconnecting the four-pin connector on the main/
unified harness from the four-pin connector on the
ETV before turning the unit off. The microprocessor
closes the ETV when the unit is turned off. Refer to
the appropriate Diagnostic Manual for information
about the Evacuation Mode/Test.
Figure 96.
ETV
1.
Four-Pin Connector
2.
Stepper Motor
3.
Valve Body
C
CA
AU
UT
TIIO
ON
N
R
Riisskk o
off IIn
njju
urry
y!!
IIff tth
he
e E
ET
TV
V iiss ssttu
ucckk iin
n tth
he
e ccllo
osse
ed
d p
po
ossiittiio
on
n,, m
mu
ucch
h o
off
tth
he
e rre
effrriig
ge
erra
an
ntt cch
ha
arrg
ge
e m
ma
ay
y b
be
e ttrra
ap
pp
pe
ed
d iin
n tth
he
e
e
ev
va
ap
po
orra
atto
orr a
an
nd
d a
accccu
um
mu
ulla
atto
orr.. IIff y
yo
ou
u h
he
ea
arr
rre
effrriig
ge
erra
an
ntt b
be
eg
giin
n tto
o ffllo
ow
w tth
hrro
ou
ug
gh
h tth
he
e v
va
allv
ve
e w
wh
he
en
n
tth
he
e sstte
ep
pp
pe
err m
mo
otto
orr a
an
nd
d p
piisstto
on
n a
asssse
em
mb
blly
y a
arre
e
llo
oo
osse
en
ne
ed
d,, u
un
nssccrre
ew
w tth
he
e ffo
ou
urr ssccrre
ew
wss o
on
n tth
he
e sstte
ep
pp
pe
err
m
mo
otto
orr n
no
o m
mo
orre
e tth
ha
an
n ffo
ou
urr ttu
urrn
nss e
ea
acch
h a
an
nd
d cch
he
ecckk tth
he
e
ssu
uccttiio
on
n ((llo
ow
w ssiid
de
e)) p
prre
essssu
urre
e o
on
n tth
he
e g
ga
au
ug
ge
e m
ma
an
niiffo
olld
d..
IIff tth
he
e ssu
uccttiio
on
n p
prre
essssu
urre
e h
ha
ass iin
nccrre
ea
asse
ed
d ffrro
om
m tth
he
e
p
prre
essssu
urre
e tto
o w
wh
hiicch
h iitt w
wa
ass e
eq
qu
ua
alliizze
ed
d a
afftte
err tth
he
e llo
ow
w
ssiid
de
e p
pu
um
mp
p d
do
ow
wn
n,, rre
effrriig
ge
erra
an
ntt iiss ttrra
ap
pp
pe
ed
d a
an
nd
d m
mu
usstt
b
be
e rre
ecco
ov
ve
erre
ed
d.. S
Sccrre
ew
w tth
he
e sstte
ep
pp
pe
err m
mo
otto
orr a
an
nd
d p
piisstto
on
n
a
asssse
em
mb
blly
y b
ba
acckk iin
ntto
o tth
he
e v
va
allv
ve
e b
bo
od
dy
y.. A
Atttta
acch
h a
a
rre
effrriig
ge
erra
an
ntt rre
ecco
ov
ve
erry
y d
de
ev
viicce
e tto
o tth
he
e sse
errv
viicce
e p
po
orrtt o
on
n
tth
he
e rre
ecce
eiiv
ve
err tta
an
nkk o
ou
uttlle
ett v
va
allv
ve
e.. M
Miid
dsse
ea
att tth
he
e rre
ecce
eiiv
ve
err
tta
an
nkk o
ou
uttlle
ett v
va
allv
ve
e,, a
an
nd
d rre
ecco
ov
ve
err tth
he
e rre
effrriig
ge
erra
an
ntt
cch
ha
arrg
ge
e.. T
Th
he
e sstte
ep
pp
pe
err m
mo
otto
orr a
an
nd
d p
piisstto
on
n a
asssse
em
mb
blly
y
m
ma
ay
y tth
he
en
n b
be
e rre
em
mo
ov
ve
ed
d..
3. Remove the four screws that attach the stepper
motor to the valve body.
Figure 97.
Removing Stepper Motor
1.
Remove Four Screws
4. If the complete ETV assembly is being replaced,
unsolder and remove the valve body. It may be
necessary to unsolder the tubes above or below the
valve body to obtain enough clearance to remove
the valve body. Note the position of the valve body
so the new one will be placed in the same position.
The new ETV could interfere with other
components if it is not placed in the same position
as the old one.
