Airflow Volume Control System Diagram; Airflow Volume Control Operation; Airflow Volume Automatic Control - Mazda CX-9 2007 Service Highlights

AIRFLOW VOLUME CONTROL SYSTEM DIAGRAM

ENGINE
COOLANT
TEMPERATURE
ECT
SENSOR SIGNAL
EVAPORATOR
TEMPERATURE
SENSOR
(FRONT/REAR)
End Of Sie

AIRFLOW VOLUME CONTROL OPERATION

Airflow Volume Automatic Control

• The front climate control unit calculates the applied voltage to the blower motor based on the input from the
target temperature, ECT sensor and evaporator temperature sensor (front/rear), and outputs the drive signal to
the power MOS FET (front/rear). However, the warm-up correction, mild start correction, MAX HOT and MAX
COLD correction and defroster correction take precedence under the operation conditions of the warm-up
correction, mild start correction, MAX HOT and MAX COLD correction and defroster correction.
BLOWER MOTOR
APPLIED VOLTAGE
• Switches the front blower motor applied voltage in 31 steps when the front power MOS FET is on. The front
blower motor applied voltage is as follows:
Fan level
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CONTROL SYSTEM
FRONT
CLIMATE
CONTROL
UNIT
OUTPUT
FEEDBACK
TARGET
TEMPERATURE
(V)
LO
TARGET TEMPERATURE
Front blower motor
applied voltage
3.41 V
3.73 V
4.05 V
4.37 V
4.69 V
5.01 V
5.33 V
5.65 V
5.97 V
6.29 V
6.61 V
6.93 V
7.25 V
7.57 V
7.89 V
8.21 V
POWER MOS FET
BLOWER MOTOR
(FRONT/REAR)
(FRONT/REAR)
OPERATION
HI
°C {°F}
Fan level
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 (MAX HI)
id074000102500
AIRFLOW
VOLUME
CHANGE
ac9uun00000230
id074000102600
07-40
am8rrn00000275
Front blower motor
applied voltage
8.53 V
8.85 V
9.17 V
9.49 V
9.81 V
10.13 V
10.45 V
10.77 V
11.09 V
11.41 V
11.73 V
12.05 V
12.37 V
12.69 V
V
B
07-40–23