A/C Does Not Work - Mazda MX-5 1990 Workshop Manual

TROUBLESHOOTING GVIDE
34 Ale DOES NOT WORK
DESCRIP· • Blower fan operates but cool air not expelled
TION
[TROUBLESHOOTING HINTS]
• Open or short circuit in wiring harness
• Ale
relay malfunction
• Ale
switch malfunction
• Magnetic clutch malfunction
• ECU malfunction
STEP INSPECTION
Ground (LIB) wire at A/C relay with jumper wire
and check if condenser fan operates when igni-
tion switch turned ON
~B
,t1
/.~
2 Ground (LIB) wire at ECU with jumper wire and
check if condenser fan operates when ignition
switch tu rned ON
Irttt
I
I
°1
I i I I I
11f
I II
myml
LIB
3 Check if A/C switch is OK
c:r page
U-25
ACTION
Yes Go to next step
No Go to Ale system Troubleshooting
Yes Go to next step
No Repair (LIB) wire between ECU and
A/C
relay
Yes Try known good ECU
No Check
AIC
switch and wiring
F
a
page U-4
eJ>
page F-7
c:r page
F-127
c:r page U-25
05UOFX-051
F-73