Symptom:
REFRIG PRESS SENSOR HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
5 VOLT SUP PLY CIRCUIT SH ORTE D TO VOLTAGE
RE F RIGERANT PRE SSURE SE NSOR FE EDBACK CIRCUIT SH ORTE D TO VOLTAGE
5 VOLT SUP PLY CKT SH ORTE D TO REF RIGE RANT PRE SSURE SE NSOR FE EDBACK CKT
AUTOMATIC TE MPE RATURE CONTROL (ATC)
5 VOLT SUP PLY CIRCUIT OPE N
RE F RIGERANT PRE SSURE SE NSOR FE EDBACK CIRCUIT OPE N
SENSOR GROUND CIRCUIT OPEN
RE F RIGERANT PRE SSURE SE NSOR
TE S T ACTION AP PLICAB ILITY
1 Tur n th e ign it ion off.
NOTE: Ch e c k c o n n e c to rs - Cle an /re pa i r a s n e c e ss a ry.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol (ATC) C1 ha r n ess conn ect or.
Tur n th e ign it ion on .
Mea su r e th e volt a ge of th e 5 Volt Su pply cir cu it .
Is t h e volt a ge above 0.2 volt s?
All
Ye s → Repa ir t h e 5 Volt Su pply cir cu it for a sh or t t o volta ge.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Go To 2
2 Tur n th e ign it ion off.
NOTE: Ch e c k c o n n e c to rs - Cle an /re pa i r a s n e c e ss a ry.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol (ATC) C1 ha r n ess conn ect or.
Tur n th e ign it ion on .
Mea su r e th e volt a ge of th e Refr iger a n t Pr essu r e Sen sor F eedba ck cir cu it.
Is t h e volt a ge above 0.2 volt s?
All
Ye s → Repa ir t he Refr iger a n t Pr essu r e Sen sor Feedba ck cir cu it for a
sh or t to volt a ge.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Go To 3
3 Tur n th e ign it ion off.
NOTE: Ch e c k c o n n e c to rs - Cle an /re pa i r a s n e c e ss a ry.
Discon n ect t he Refr iger a n t Pr essu r e Sen sor ha r n ess con n ect or.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol (ATC) C1 ha r n ess conn ect or.
Mea su r e th e r esist a n ce bet ween t h e 5 Volt Su pply cir cu it a n d th e Refr iger a n t
Pr essu r e Sen sor Feedba ck cir cu it.
Is t h e resista n ce below 10k ohm s?
All
Ye s → Repa ir th e 5 Volt Su pply cir cu it for a sh or t t o th e Refr iger a n t
Pr essu r e Sen sor Feedba ck cir cu it.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Go To 4
171
HEAT IN G & A/C
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