6*
INSPECT TO SEE WHETHER
MALFUNCTION IS IN WIRING HARNESS
(BETWEEN REFRIGERANT PRESSURE
SWITCH AND PCM) OR PCM
z
Test voltage at A/C signal terminal of PCM.
z
Is voltage
approx. 12 V?
Yes
Repair wiring harness between PCM and
refrigerant pressure switch, then go to
Step 16.
No
Inspect PCM, then go to Step 16.
7
INSPECT TO SEE WHETHER
MALFUNCTION IS IN REFRIGERANT
PRESSURE SWITCH, REFRIGERANT
AMOUNT, OR ELSEWHERE
z
Does cool air blow out when terminals B and
C of refrigerant pressure switch connector are
shorted?
Yes Go to the next step.
No
Go to Step 9.
8
INSPECT TO SEE WHETHER
MALFUNCTION IS IN REFRIGERANT
PRESSURE SWITCH OR REFRIGERANT
AMOUNT
z
Inspect refrigerant pressure switch.
z
Is it okay?
Yes
If refrigerant amount is empty, replace
condenser, vacuum refrigerant line more
than 30 min by vacuum pump, and add
refrigerant to specified level, then go to
Step 16.
No
Replace refrigerant pressure switch, then
go to Step 16.
9
INSPECT TO SEE WHETHER
MALFUNCTION (SHORT CIRCUIT) IS IN
A/C CONTROL SIGNAL CIRCUIT
(BETWEEN A/C RELAY AND PCM) OR
ELSEWHERE
z
Does cool air blow out when terminal A of
A/C relay connector (A/C control signal) is
grounded?
Yes Release short, then go to the next step.
No
Go to Step 11.
10*
INSPECT TO SEE WHETHER
MALFUNCTION (OPEN OR SHORT
CIRCUIT) IS IN PCM OR WIRING HARNESS
(BETWEEN A/C RELAY AND PCM)
z
Test voltage at the A/C relay control signal
terminal of PCM.
z
Is voltage
approx. 12 V?
Yes Inspect PCM, then go to Step 16.
No
Repair wiring harness between A/C relay
and PCM, then go to Step 16.
11*
INSPECT TO SEE WHETHER
MALFUNCTION IS IN MAGNETIC CLUTCH
OR ELSEWHERE
z
Test voltage at the following terminal of
magnetic clutch thermal protector.
Yes
Inspect magnetic clutch, then go to Step
16.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 28
© 2005 Mitchell Repair Information Company, LLC.
