Mazda CX-9 Grand Touring 2009 Manual page 1750

DIAGNOSTIC PROCEDURE
NO.3 AIR INTAKE MODE FROM FRONT VENT DOES NOT CHANGE DIAGNOSTIC
PROCEDURE
STEP
INSPECT AIR INTAKE ACTUATOR
1
Is the air intake actuator normal?
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
Turn the ignition switch to the ON position.
Measure the voltages at the following climate control
unit terminals.
2*
Terminal 1O (24-pin, RECIRCULATE motor
drive signal)
Terminal 1M (24-pin, FRESH motor drive
signal)
(See FRONT CLIMATE CONTROL UNIT
INSPECTION .)
Are voltages normal?
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)
Measure the voltages at the following air intake
actuator terminals.
3*
Terminal C (RECIRCULATE motor drive
signal)
Terminal A (FRESH motor drive signal)
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
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
INSPECTION ACTION
Yes Go to the next step.
Replace the air intake actuator,
No
then go to Step 9.
Yes Go to the next step.
No Go to Step 4.
Yes Go to Step 7.
Repair the wiring harness
between the climate control unit
No
and air intake actuator, then go
to Step 9.