Mazda MX-5 1990 Workshop Manual page 756

TROUBLESHOOTING GUIDE
Measured pressure
Low side:
Below 78.5 kPa
(0.8 kg/cm2, 11.4 psi)
High side:
785-883 kPa
(8-9 kg/cm2,
114-128 psi)
Low side:
Above 245 kPa
(2.5 kg/cm2, 35.6 psi)
High side:
Above 1,962 kPa
(20 kg/cm
2
,
284 psi)
Low side:
Above 245 kPa
. (2.5 kg/cm
2
, 35.6 psi)
High side:
Above 2,256 kPa
(23 kg/cm2, 327 psi)
Low side:
50 cmHg (2.0 inHg) of
Vacuum-147 kPa
(1.5 kg/cm2, 21.3 psi)
High side:
687-1.472 kPa
(7-15 kg/cm 2 ,
100-213 psi)
Low side:
76 cmHg (3.0 inHg)
of Vacuum
High side:
Below 589 kPa
(6 kg/cm2, 85 psi)
Low side:
Above 245 kPa
(2.5 kg/cm
2
,
35.6 psi)
High side:
1,864-1,962 kPa
(19-20 kg/cm 2 ,
270-284 psi)
Low side:
392-589 kPa
(4-6 kg/cm2,
57-85 psi)
High side:
687-981 kPa
(7-10 kg/cm2,
1 00-142 psi)
Possible cause
I nsufficient refrigerant
E.xcessive refrigerant or insuffi-
cient condenser cooling
Air in system -
Moisture in system
No refrigerant circulation
Expansion valve stuck open
Faulty compressor
u
Action
Case 1
(Refer to page U-14)
Case 2
(Refer to page U-15)
Case 3
(Refer to page U-15)
Case 4
(Refer to page U-16)
r
Case 5
(Refer to page U-16)
Case 6
(Refer to page U-17)
Case 7
(Refer to page U- 17)
05UOUX-022
U 13