Mazda MX-5 Miata Sport 2007 Manual page 2034

2007 ENGINE PERFORMANCE Symptom Troubleshooting - MX-5 Miata
NO.23 A/C DOES NOT WORK SUFFICIENTLY [LF]
POSSIBLE CAUSE & DESCRIPTION (A/C DOES NOT WORK SUFFICIENTLY)
DESCRIPTION
POSSIBLE CAUSE
DIAGNOSTIC PROCEDURE
A/C DOES NOT WORK SUFFICIENTLY DIAGNOSTIC PROCEDURE TABLE
STEP
1
2
2007 Mazda MX-5 Miata Sport
information is not available, replace the PCM.
(See PCM REMOVAL/INSTALLATION [LF] .)
23
INSPECTION
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?
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
A/C DOES NOT WORK SUFFICIENTLY.
A/C compressor magnetic clutch does not engage
when the A/C switch is turned on.
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
RESULTS
Yes
No
Yes
No
ACTION
DTC is displayed:
Go to the appropriate
DTC inspection.
(See DTC TABLE
[LF] .)
No DTC is displayed:
Go to the next step.
Inspect for GND
condition of magnetic
clutch on A/C
compressor.
If GND condition is
normal, inspect for open
circuit magnetic clutch
coil.
Go to the next step.