Dodge Sprinter 2006 Manual page 2046

24 - 14 CONTROLS-FRONT
(5) In st a ll t h e t wo A/C-h ea t er con t r ol r et a in in g
scr ews. Tigh t en t h e scr ews t o 2 N·m (17 in . lbs.).
(6) In st a ll t h e cen t er bezel on t o t h e in st r u m en t
pa n el (Refer t o 23 - BODY/INSTRUME NT PANE L/
INSTRUME NT PANE L CE NTE R BE ZE L - INSTAL-
LATION).
(7) Recon n ect t h e n ega t ive ba t t er y ca ble.
A / C PRESSU RE T RAN S-
DU CER
DESCRIPTION
Th e A/C pr essu r e t r a n sdu cer is in st a lled on t h e liq-
u id lin e fit t in g loca t ed a t t h e t op of t h e r eceiver /dr ier
(F ig. 9). A r u bber O-r in g sea ls t h e con n ect ion
bet ween t h e t r a n sdu cer a n d t h e fit t in g. Th r ee t er m i-
n a ls wit h in a m olded pla st ic con n ect or r ecept a cle on
t h e t op of t h e t r a n sdu cer con n ect it t o t h e veh icle
elect r ica l syst em t h r ou gh a wir e lea d a n d con n ect or.
Th e A/C pr essu r e t r a n sdu cer ca n n ot be a dju st ed or
r epa ir ed a n d, if fa u lt y or da m a ged, it m u st be
r epla ced.
Fig. 9 A/C Pressure Transducer
1 - A/C PRESSURE TRANSDUCER
2 - PIEZORESISTIVE ELEMENT
3 - WIRE CONNECTOR
OPERA TION
Th e A/C pr essu r e t r a n sdu cer m on it or s t h e pr es-
su r es in t h e h igh side of t h e r efr iger a n t syst em
t h r ou gh it s con n ect ion t o a fit t in g on t h e liqu id lin e.
Th e t r a n sdu cer will ch a n ge it s in t er n a l r esist a n ce in
r espon se t o t h e pr essu r es it m on it or s. Th e ATC con -
t r ol m odu le pr ovides a five volt r efer en ce sign a l a n d
m on it or s t h e ou t pu t volt a ge of t h e t r a n sdu cer on t h e
t r a n sdu cer r et u r n cir cu it t o det er m in e r efr iger a n t
pr essu r e. Th e ATC m odu le is pr epr ogr a m m ed t o
r espon d t o t h is a n d ot h er sen sor in pu t s by con t r ollin g
t h e oper a t ion of t h e a ir con dit ion in g com pr essor
clu t ch a n d t h e a u xilia r y r a dia t or coolin g fa n t o h elp
opt im ize a ir con dit ion in g syst em per for m a n ce a n d t o
pr ot ect t h e syst em com pon en t s fr om da m a ge. Th e
A/C pr essu r e t r a n sdu cer in pu t t o t h e ATC m odu le
a lso pr even t s t h e A/C com pr essor clu t ch fr om en ga g-
in g wh en t h e a m bien t t em per a t u r e is below 0.556° C
(33° F ) du e t o t h e pr essu r e/t em per a t u r e r ela t ion sh ip
of t h e r efr iger a n t .
Th e A/C pr essu r e t r a n sdu cer is dia gn osed by per-
for m in g t h e ATC F u n ct ion Test u sin g t h e DRBIII
sca n t ool. Refer t o Body Dia gn ost ic P r ocedu r es.
Th e A/C pr essu r e t r a n sdu cer ca n n ot be a dju st ed or
r epa ir ed a n d, if fa u lt y or da m a ged, it m u st be
r epla ced.
DI AGN OSI S AN D T EST I N G
A / C PRESSURE TRANSDUCER
Th e A/C pr essu r e t r a n sdu cer is t est ed u sin g a
DRBIII sca n t ool. Refer t o Body Dia gn ost ic P r oce-
du r es. Befor e t est in g t h e A/C pr essu r e t r a n sdu cer, be
cer t a in t h a t t h e t r a n sdu cer wir e h a r n ess con n ect ion s
a r e clea n of cor r osion a n d pr oper ly con n ect ed. F or
t h e a ir con dit ion in g syst em t o oper a t e, a n A/C pr es-
su r e t r a n sdu cer volt a ge r ea din g bet ween 0.7 a n d 4.56
volt s is r equ ir ed. Volt a ge ou t side t h is r a n ge in dica t e
a low or h igh r efr iger a n t syst em pr essu r e con dit ion
t o t h e ATC con t r ol m odu le. Th e con t r ol m odu le is
pr ogr a m m ed t o r espon d t o a low or h igh r efr iger a n t
syst em pr essu r e by su ppr essin g oper a t ion of t h e com -
pr essor. Refer t o t h e A/C P r essu r e Tr a n sdu cer Volt -
a ge ch a r t for t h e possible con dit ion in dica t ed by t h e
t r a n sdu cer volt a ge r ea din gs.
VA