NO.10 NOISE WHILE OPERATING A/C SYSTEM.
NO.10 NOISE WHILE OPERATING A/C SYSTEM DESCRIPTION AND POSSIBLE CAUSE
{
Terminal B (magnetic clutch operation
signal)
z
Is voltage
approx. 12 V?
No
Go to the next step.
12
INSPECT FUSE
z
Are A/C relay power supply fuses okay?
Yes Go to the next step.
No
Replace fuse, then go to Step 16. If fuse
burns out immediately, go to the next
step.
13
INSPECT WIRING HARNESS BETWEEN
FUSE BLOCK AND A/C RELAY FOR LACK
OF CONTINUITY
z
Test voltages at following terminals of A/C
relay.
{
Terminal E (A/C relay control signal)
{
Terminal C (A/C control signal)
z
Are voltages approx. 12 V?
Yes Go to the next step.
No Repair wiring harness between fuse block
and A/C relay, then go to Step 16.
14
INSPECT TO SEE WHETHER
MALFUNCTION IS IN A/C RELAY OR
WIRING HARNESS (BETWEEN A/C RELAY
AND MAGNETIC CLUTCH) AND
EVAPORATOR TEMPERATURE SENSOR
z
Test voltage at the following terminal of A/C
relay.
{
Terminal D (magnetic clutch operation
signal)
z
Is voltage
approx. 12 V?
Yes
Inspect wiring harness between A/C relay
and magnetic clutch.
z
If above wiring harness is OK, go
to the next step.
z
If above wiring harness
malfunctions, repair wiring harness,
then go to Step 16.
No
Replace A/C relay, then go to Step 16.
15
INSPECT EVAPORATOR TEMPERATURE
SENSOR
z
Inspect evaporator temperature sensor.
z
Is it okay?
Yes Go to the next step.
No Replace evaporator temperature sensor,
then go to the next step.
16
VERIFY REPAIR
z
Does cool air blow out from front/rear vents?
(Are the results of refrigerant system
performance test okay?)
Yes
Troubleshooting completed. Explain
repairs to customer.
No
Recheck malfunction symptoms, then
repeat from Step 1 if malfunction recurs.
10
Noise while operating A/C system.
z
Problem with A/C basic system installation
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 29
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