z
When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors
while performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.
DIAGNOSTIC PROCEDURE
NO.9 NO COOL AIR FROM FRONT/REAR VENTS DIAGNOSTIC PROCEDURE
z
Malfunction in A/C relay
z
Malfunction in evaporator temperature sensor
z
Malfunction in BCM unit
STEP
INSPECTION
ACTION
1
INSPECT AIR FLOW FROM VENTS
z
Does air blow out?
Yes Go to the next step.
No
Go to Step 1 of troubleshooting indexes
No.1 and 2.
2
INSPECT A/C COMPRESSOR OPERATION
z
Start engine.
z
Turn A/C switch and fan switch on.
z
Does A/C compressor operate?
Yes Go to Step 1 of troubleshooting index
No.7.
No
Go to the next step.
3
INSPECT FOR DTC IN PCM
z
Inspect for DTCs related to the PCM onboard
diagnostic system.
z
Are any DTCs displayed?
Yes Go to appropriate inspection procedure.
No
Go to the next step.
4
INSPECT TO SEE WHETHER
MALFUNCTION IS IN CLIMATE CONTROL
UNIT OR ELSEWHERE
z
Does cool air blow out when terminal 1S of
climate control unit connector (24-pin, A/C
signal) is grounded?
Yes
Replace climate control unit, then go to
Step 16.
No
Release short, then go to the next step.
5*
INSPECT TO SEE WHETHER
MALFUNCTION IS IN A/C SIGNAL
CIRCUIT (BETWEEN REFRIGERANT
PRESSURE SWITCH AND PCM) OR
ELSEWHERE
z
Test voltage at following terminal of
refrigerant pressure switch.
{
Terminal B (A/C signal)
z
Is voltage
approx. 12 V?
Yes Go to Step 7.
No
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 27
© 2005 Mitchell Repair Information Company, LLC.
