NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY
[MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
z
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
(see
PCM REMOVAL/INSTALLATION [MZI-3.5]
.)
24
A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
DESCRIPTION
A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE
z
A/C compressor magnetic clutch engagement is stuck.
z
A/C relay is stuck closed.
z
Short to GND in wiring harness between A/C switch and PCM
z
Short to GND in wiring harness between A/C relay and PCM
z
Short circuit to battery power in A/C relay to magnetic clutch
STEP INSPECTION
RESULTS ACTION
1
Connect the M-MDS 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 [MZI-3.5]
.)
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:
z
A/C relay is stuck closed.
z
Short to GND in wiring
harness between A/C relay and
PCM terminal 1N.
If both items normal, go to the next
step.
No
Inspect if circuit between the A/C
relay and magnetic clutch shorts to
battery power circuit.
If the circuit is normal, inspect the
magnetic clutch for stuck
engagement or clearance.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:38 AM
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