Toyota Celica 1993 AT200 series Repair Manual page 1029

AC-74
AIR CONDITIONING SYSTEM - PRESSURE SWITCH
PRESSURE SWITCH
O N - V E H I C L E I N S P E C T I O N
1. INSTALL MANIFOLD GAUGE SET
(See page AC - 1 5)
2. DISCONNECT CONNECTOR FROM PRESSURE
swtTcH
3.
RUT{ ENGINE AT APPROX. 2,OOO RPM
4. INSPECT PRESSURE
SWITCH OPERATION
M!gnctic Clutch Cont?ol:
(a) Conn€ct th6 positiva (+) lead from the ohmmeter to
t e r m i n a l 4 a n d n e g a t i v e ( - ) l e a d t o t € r m i n a l 1 .
(b) Check continuity betw€sn t€rminals when refrigerant
prossure is changed, as shown.
lf operation is not as specified, replace the prossure
swrtch.
Cooling Fan Control:
(a) Connect th6 positive (*) lead from the ohmmet6r to
t e r m i n a l 2 a n d n e g a t i v e ( - ) l e a d t o t e r m i n a l 3 .
(b) Check continuity betweon lerminals when refrigerant
prossurs is changed, as shown.
lf operation is not as specified, raplace the pressure
switch.
5 .
S T O P E N G I N E A N D R E M O V E M A N I F O L D G A U G E
SET
6. CONNECT CONNECTOR TO PRESSURE SWITCH
( M a g n e t i c C l u t c h C o n t r o l i
Low Pressur€ Side High Pressure Side
1 2 . 0 k g f / c m ' , 2 8 p s i ) ( 3 2 . 0 k g t / c m 2 , 4 5 5 p s i )
O F F ( N o C o n t i n u i t y ) O F F ( N o C o n t i n ! l t y )
N o l l ' 1
^ ) < L , ,
O N ( C o n r i n u i t y )
3 , 1 4 0 k P a
(Cooling Fan Controt)
1 5 2 0 k p !
( 1 5 . 5 k g f l c h 2 , 2 2 0 p s t )
1.?26 kpr
(No continuity)
( 1 2 . 5 k q f / q h : , 1 7 8 p s l )