NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF]
POSSIBLE CAUSE & DESCRIPTION (A/C DOES NOT WORK SUFFICIENTLY)
DIAGNOSTIC PROCEDURE
A/C DOES NOT WORK SUFFICIENTLY DIAGNOSTIC PROCEDURE TABLE
information is not available, replace the PCM.
(See
PCM REMOVAL/INSTALLATION [LF]
.)
23
A/C DOES NOT WORK SUFFICIENTLY.
DESCRIPTION
A/C compressor magnetic clutch does not engage
when the A/C switch is turned on.
POSSIBLE CAUSE
Improper refrigerant charging amount
Open the A/C magnetic clutch
Open circuit in wiring harness between A/C
relay and A/C magnetic clutch
Poor GND of A/C magnetic clutch
Refrigerant pressure switch is stuck open.
A/C relay is stuck open.
Seized A/C compressor
Open circuit in wiring harness between A/C
switch and PCM through both refrigerant
pressure switch and A/C amplifier
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
Disconnect A/C
compressor connector.
Start engine and turn A/C
switch on.
Is there correct voltage at
A/C compressor
magnetic clutch terminal?
Specification
10.5 V or more
Yes
Inspect for GND
condition of magnetic
clutch on A/C
compressor.
If GND condition is
normal, inspect for open
circuit magnetic clutch
coil.
No
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 101
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