3
Disconnect refrigerant
pressure switch
connector.
Connect jumper wiring
between A/C high
pressure switch terminal.
Connect jumper wiring
between refrigerant
pressure switch terminal.
Turn the ignition switch
to the ON position.
Turn A/C switch on and
set blower fan to any
speed.
Does A/C work?
Yes
Inspect refrigerant
pressure switch
operation.
If switch is normal, go to
the next step.
No
Inspect for the following:
A/C switch is stuck
open.
Open circuit in
wiring harness
between refrigerant
pressure switch and
PCM terminal 1AU
Open circuit in
wiring harness
between blower
motor fan switch
and resistor (if
blower motor does
not operate)
Evaporator
temperature sensor
and A/C amplifier
4
Remove jumper wiring
from the switch
connector.
Reconnect connector to
refrigerant pressure
switch.
Start the engine and turn
the A/C switch on.
Does the fan operate?
Yes
Inspect whether A/C
relay is stuck open.
Replace if necessary.
No
Inspect the following and
repair or replace if
necessary:
Refrigerant
charging amount
A/C compressor
for seizure
5
Verify test results.
If normal, return to diagnostic index to service any additional
symptoms.
(See
ENGINE SYMPTOM TROUBLESHOOTING [LF]
.)
If malfunction remains, inspect related Service Bulletins and/or
On-line Repair Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 102
© 2005 Mitchell Repair Information Company, LLC.
