1. Con n ect t h e DRBIII" to the DLC.
2. Pla ce t he sh ift lever in pa rk.
3. St a r t t h e en gin e.
4. Set t h e blower t o h igh speed.
5. Set t h e tem per at u re select or t o fu ll cold.
6. Pr ess a ir con dit ion in g swit ch on .
7. Wit h t he DRBIII" in Sen sor s, ver ify th at t h e:
A. am bien t t emper a tu r e is a bove 59F (15C).
B. r efr iger a nt pr essu r e is bet ween 29 a nd 348
PSI (2 an d 24 ba r ).
C. eva por a tor t em per a tu r e i s a bove 36.5F
(2.5C).
D. coola n t tem per at u re is a bove 158F (70C).
Wh en all of the pr er equ isit es ha ve been m et , u se
the DRBIII" t o r ecord a n d er a se a ll st or ed ATC
DTCs, a nd t h en select Syst em Test s, a nd r u n th e
ATC Fu nct ion Test . Wh en com plet e, ch eck t o see if
an y act ive DTCs a r e pr esen t. If so, r efer t o t he
sym pt om list in t h e H ea t in g & A/C ca t egor y for th e
dia gn ost ic pr ocedu re(s). If t her e a r e n o DTCs
pr esen t , yet th e per for ma n ce seem s less t h a n idea l,
use the DRBIII" to look at all sen sor va lu es a nd t h e
st at u s of t he va r iou s inpu t s an d ou tpu t s to see if
th er e is a deficien cy det ect ed t ha t h a s n ot fully sh u t
down th e syst em. For addit ion a l i n form a tion , r efer
to Sen sor Va lu es a n d In pu t/Ou t pu t St at u s u n der
Dia gn ost ic Tips in t h is sect ion an d t o Sect ion 11.0
for eva por at or t em per a tu r e sen sor a n d air ou tlet
tem per at u re sen sor r esist a nce t o t emper a tu r e spec-
ifica tion s ch a rt s. Also, con fir m th a t t h e wa t er cycle
va lve is fun ct ion in g. Rem ember t h a t t he va lve is
nor m ally open . The pu lse widt h sign a l will offer
in sigh t in t o t h e va lve’s oper a t ion . The lower t h e
percen t age n u mber, th e m or e open t h e va lve be-
comes. Con fir m th a t t he va lve is respon din g to t h e
sign al fr om t he ATC. If fu n ction in g cor rect ly, ver ify
mode a n d blen d door oper a tion . If oka y, th e dia gn o-
sis th en becom es pu rely r efr iger an t syst em r ela ted.
Att a ch t he appropr iat e ga uges a n d dia gn ose t h e
refr iger at ion syst em . Refer t o th e Ser vice In for ma -
tion for refr iger an t system diagn ost ic pr ocedu res.
DIAGNOSTIC TIPS
SENSOR VALUES
Ambie nt Air Temper at ur e
Th e In st ru m ent Clust er tr a nsm it s Am bien t Air
Tem per at u r e Sen sor da t a . In t h e even t of a CAN
Bu s com mu n ica t ion fa ilu r e, t he la st st or ed va lu e is
displayed as a substitu te va lu e.
In t e r io r Te mp er a ture
Th e n or ma l ra n ge for th e In t er ior Tem per a t u r e
Sensor is fr om 32°F t o 104°F. An im pla usible t em -
pera t ur e va lu e in dica t es t ha t t he In t erior Tem per-
at u re Sen sor is ba d. Th e r epa ir in t h is ca se would be
to r epla ce t h e ATC Modu le since t h e sen sor is
in t egr a l to t h e m odu le.
Evaporator Temperature
Th e nor ma l r an ge for th e Eva por at or Tem per at u r e
Sensor is fr om 14°F t o 104°F. A su bst it u t e va lu e of
14°F wit h n o u pda t es in dica t es a n E va por a tor Tem -
pera t ur e Sen sor cir cu it fa ilu r e.
Ai r O utl e t Temper atur e
Th e n or m al r a n ge for t h e Air Ou t let Tem per a tu r e
Sensor is fr om 32°F t o 203°F. A su bst it u t e va lu e of
111.1°F in dica t es an Air Out let Tem pera t ur e Sen sor
cir cu it fa ilu r e.
Co o la nt Te mp era t u re
Th e En gin e Con t r ol Modu le tr an sm it s Coola n t
Tem per at u r e Sen sor da t e. In t h e even t of a CAN
Bu s com m u nica tion failu r e, 257°F is displa yed as a
substitu te value.
In t e r io r Te mp er a ture Co n t ro l le r
Th e n or ma l ra n ge for th e Blen d con t r ol is from 62°F
to 144°F. Th is va lu e r epr esen t s th e t em pera t ur e set
by t h e oper at or. An im pla u sible tem per at u r e va lu e
or a tem per a t u r e va lu e t ha t fa ils t o cha n ge wh en
rot a tin g t h e Blen d con tr ol in dica tes tha t t h e Blen d
cont r ol is ba d. Th e r epa ir in t h is ca se wou ld be t o
repla ce t he ATC Modu le sin ce t h e Blen d con t r ol
in t egr a l to t h e m odu le.
Refrigerant P ressure
Th e n or ma l r an ge for the Refr iger an t Pr essu re
Sensor is from 29 PSI to 406 P SI. A su bst it u te va lu e
of 413 PSI in dica t es a Refr iger an t Pr essu re Sen sor
cir cu it fa ilu r e. In a ddit ion , th e n orm a l ra n ge for
Pr essu r e Sen sor volt a ge is 0 volt s to 5 volt s. A valu e
of 0.9 volt s i n dica t es an open volt age su pply cir cu it ,
wh ile a va lu e of -999 in dica t es an open in a ll t h ree
sensor cir cuit s.
Wa t e r C y c l e Va l v e
Th e n orm a l r a nge of t h e Wat er Cycle Va lve is from
0% t o 100%. Th e va lu e in dica tes th e ext en t to wh ich
th e va lve is closed. A va lu e of 100% in dica tes t ha t
th e va lve is fully closed.
In t e ns e Ins t Li g h t
Th e I nst r u m en t Clust er t r a n sm it s t h is da t a . Th e
nor m al r a nge for ligh t in g in t ensit y is from 0% t o
100%. Th e va lu e in dica tes t h e ext en t t o wh ich t h e
illu m in a tion ha s dim m ed. A va lu e of 0% in dica t es
br igh t wh ile a valu e >0% in dica tes dim min g. In t he
even t of a CAN Bu s comm u nica t ion fa ilu re, 0% is
displayed as a substitu te va lu e.
INPUT/OUTPUT STATUS
Co m p r e s s o r Clu t c h
Th e ATC Modu le t r a nsm it s t his dat a . A st a tu s of
#ON # in dica tes t ha t th e com pr essor is oper at ion a l. A
st at u s of #OF F # in dica tes t h e com pr essor is n ot
opera t ion a l.
6
GEN ERAL I N FORM AT I ON
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