Mazda CX-9 Grand Touring 2009 Manual page 1751

Disconnect the air intake actuator connector.
Measure the voltages at the following climate control
unit terminals.
Terminal 10 (RECIRCULATE motor drive
4
signal)
Terminal 1M (FRESH motor drive signal) (See
FRONT CLIMATE CONTROL UNIT
INSPECTION .)
Are voltages normal?
INSPECT TO SEE WHETHER MALFUNCTION IS IN
WIRING HARNESS (SHORT TO B+ BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR) OR ELSEWHERE
Disconnect the climate control unit connector.
5
Measure the voltages at the following climate control
unit terminals.
Terminal 1O (RECIRCULATE motor drive
signal)
Terminal 1M (FRESH motor drive signal)
Are voltages approx. 0 V?
INSPECT TO SEE WHETHER MALFUNCTION IS IN
WIRING HARNESS (SHORT TO GROUND
BETWEEN CLIMATE CONTROL UNIT AND AIR
INTAKE ACTUATOR) OR ELSEWHERE
Turn the ignition switch to the LOCK position.
6
Inspect for continuity at the following terminals
between the climate control unit and ground.
Terminal 10 (RECIRCULATE motor drive
signal)
Terminal 1M (FRESH motor drive signal)
Is there continuity?
INSPECT AIR INTAKE LINK
Inspect the air intake links for followings:
is there grease on link?
7
Are the links securely and properly installed?
Are the links free of obstructions and
hindrances?
Are the above items normal?
INSPECT TO SEE WHETHER MALFUNCTION IS IN
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Inspect the air intake actuator,
Yes
then go to Step 9.
No Go to the next step.
Yes Go to the next step.
Repair the wiring harness
between the climate control unit
No
and air intake actuator, then go
to Step 9.
Repair the wiring harness
between the climate control unit
Yes
and air intake actuator, then go
to Step 9.
No Go to the next step.
Yes Go to the next step.
Apply grease to the links. If any
the links are damaged, replace
No
the air intake actuator, then go to
Step 9.