DIAGNOSTIC PROCEDURE
NO.3 AIR INTAKE MODE FROM FRONT VENT DOES NOT CHANGE DIAGNOSTIC
PROCEDURE
STEP
INSPECTION
ACTION
1
INSPECT AIR INTAKE ACTUATOR
z
Is the air intake actuator normal?
Yes Go to the next step.
No
Replace the air intake actuator,
then go to Step 9.
2*
INSPECT TO SEE WHETHER MALFUNCTION
(OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE
ACTUATOR, WIRING HARNESS (BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR) OR ELSEWHERE
z
Turn the ignition switch to the ON position.
z
Measure the voltages at the following climate control
unit terminals.
{
Terminal 1O (24-pin, RECIRCULATE motor
drive signal)
{
Terminal 1M (24-pin, FRESH motor drive
signal)
(See
FRONT CLIMATE CONTROL UNIT
INSPECTION
.)
z
Are voltages normal?
Yes Go to the next step.
No
Go to Step 4.
3*
INSPECT TO SEE WHETHER MALFUNCTION
(OPEN OR SHORT CIRCUIT) IS IN AIR INTAKE
ACTUATOR OR WIRING HARNESS (BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR)
z
Measure the voltages at the following air intake
actuator terminals.
{
Terminal C (RECIRCULATE motor drive
signal)
{
Terminal A (FRESH motor drive signal)
z
Are voltages as shown below?
{
Terminal C:
approx. 0.5 V
during FRESH and
approx. 10 V during RECIRCULATE
{
Terminal A:
approx. 10 V
during FRESH and
approx. 0.5 V during RECIRCULATE
Yes Go to Step 7.
No
Repair the wiring harness
between the climate control unit
and air intake actuator, then go
to Step 9.
INSPECT TO SEE WHETHER MALFUNCTION IS IN
AIR INTAKE ACTUATOR OR ELSEWHERE
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:50 AM
Page 9
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