NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY
[MZI-3.7]
NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY (MZI-3.7) DETECTION
CONDITIONS AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY (MZI-3.7) DIAGNOSTIC
PROCEDURE
4
Reconnect connector to
refrigerant pressure switch.
Start the engine and turn the A/C
switch on.
Does the fan operate?
No
Inspect the following and repair or replace if
necessary:
z
Refrigerant charging amount
z
A/C compressor for seizure
5
z
Verify test results.
{
If normal, return to diagnostic index to service any additional symptoms.
(See
SYMPTOM DIAGNOSTIC INDEX [MZI-3.7]
.)
{
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
z
If vehicle is repaired, troubleshooting completed.
z
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See
PCM REMOVAL/INSTALLATION [MZI-3.7]
.)
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-3.7]
.)
No
No DTC is displayed:
Go to the next step.
Inspect for the following:
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
Page 83
© 2005 Mitchell Repair Information Company, LLC.
