NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY
[LF]
POSSIBLE CAUSE & DESCRIPTION (A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS
CONTINUOUSLY)
DIAGNOSTIC PROCEDURE
A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY DIAGNOSTIC
PROCEDURE TABLE
If vehicle is not repaired or additional diagnostic
information is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
24
A/C IS ALWAYS ON OR A/C COMPRESSOR
RUNS CONTINUOUSLY.
DESCRIPTION
A/C compressor magnetic clutch does not
disengage.
POSSIBLE CAUSE
A/C compressor magnetic clutch engagement
is stuck.
A/C relay is stuck closed.
Short to GND in wiring harness between A/C
switch and PCM
Short to GND in wiring harness between A/C
relay and PCM
Short circuit to battery power in A/C relay to
magnetic clutch
STEP
INSPECTION
RESULTS
ACTION
1
Connect the M-MDS or
equivalent to the DLC-2.
Turn the ignition switch
to the ON position
(Engine off).
Retrieve any DTCs.
Are there any DTCs
displayed?
Yes
DTC is displayed:
Go to the appropriate
DTC inspection.
(See
DTC TABLE
[LF]
.)
No
No DTC is displayed:
Go to the next step.
2
Start the engine and idle
it.
Turn the A/C switch on.
Remove the A/C relay.
Does the A/C magnetic
clutch disengage?
Yes
Inspect for the following:
A/C relay is stuck
closed.
Short to GND in
wiring harness
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:42:10 PM
Page 103
© 2005 Mitchell Repair Information Company, LLC.