Mazda MX-5 Miata Sport 2007 Manual page 2021

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
blower fan to any speed.
Does the A/C compressor
engage?
4 Connect the M-MDS or
equivalent to DLC-2.
Access AC_REQ PID.
Start the engine and idle it.
Turn the A/C switch and fan
switch on.
Does AC_REQ PID read on?
5 Inspect cooling fan control
system operation.
2007 Mazda MX-5 Miata Sport
following and repair or
replace if necessary:
Refrigerant

charging amount
Open circuit in

wiring harness
between A/C
relay and PCM
terminal 11
Seized A/C

magnetic clutch
A/C magnetic

clutch
malfunction
If all items are normal,
go to the next step.
Yes Go to the next step.
No Inspect the following:
Refrigerant

pressure switch
operation
The A/C switch

is stuck open.
Open or short

circuit between
refrigerant
pressure switch
and PCM
terminal 1AU
Open circuit of

blower motor fan
switch and
resistor (if blower
motor does not
operate)
The evaporator

temperature
sensor and A/C
amplifier
Yes Go to the next step.