blower fan to any speed.
Does the A/C compressor
engage?
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.
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?
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
5
Inspect cooling fan control
system operation.
Yes
Go to the next step.
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 88
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