Mazda CX-9 Grand Touring 2009 Manual page 1769

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