Mazda MX-5 Miata Sport 2007 Manual page 2035

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
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?
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?
5
Verify test results.

2007 Mazda MX-5 Miata Sport
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.

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
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