Mazda CX-9 2007 Service Highlights page 298

ON-BOARD DIAGNOSTIC FUNCTION
Malfunction detection function
• Detects errors in the input and output signals. (The ignition switch is at the ON position or the engine is
running.)
• If a malfunction is detected, a DTC is output to the check connector through the malfunction display function. At
the same time, malfunction detection results are sent to the fail-safe and memory functions.
Fail-safe function
• If a malfunction is detected by the malfunction detection function and a malfunction is determined, the following
controls are performed to prevent an operating malfunction of the full-auto air conditioner and malfunction of
output parts.
Fail-safe Function Table
Part where malfunction is
determined
Cabin temperature sensor
Ambient temperature
sensor
Evaporator temperature
sensor
Solar radiation sensor
Engine coolant temperature
sensor
Rear airflow volume control
(Rear control switch on)
Rear airflow temperature
control
(Rear control switch on)
Air mix actuator
(potentiometer)
Airflow mode actuator
(potentiometer)
Air mix actuator
(motor lock)
Airflow mode actuator
(motor lock)
Memory Function
• Stores the signal determined to be malfunctioning by the malfunction detection function, and the memory is not
cleared even if the ignition switch is turned off (LOCK position) or the malfunction has been repaired.
• To clear stored malfunction information, press the front climate control unit AUTO switch and REC switch
simultaneously during past malfunction display mode.
Display Function
• Function for outputting present or past malfunction to the information display as DTCs.
Present Malfunction Display Mode
• Presently occurring malfunctions (open/short circuits) are detected and the DTCs are indicated on the
information display.
07-02–2
ON-BOARD DIAGNOSTIC
Malfunction determined when IG SW at ON
Cabin temperature sensor input value is fixed at
25 °C {77 °F}.
Ambient temperature sensor input value is fixed
at 15 °C {59 °F}.
Evaporator temperature sensor input value is
fixed at 0 °C {32 °F}.
Solar radiation sensor value is fixed at 0 W/m
Engine coolant temperature sensor input value
is fixed at 80 °C {176 °F}.
Until a malfunction is detected, perform manual
control using the normal value that was last
detected. During malfunction determination, the
rear airflow amount is controlled based on the
rear target temperature calculated from the set
temperature of the rear temperature setting dial.
Until a malfunction is detected, perform control
using the normal value that was last detected.
During malfunction determination, the rear
temperature setting is controlled at 22 °C {72
°F}
Air mix actuator drive signal is stopped right
when the malfunction is determined.
Airflow mode actuator drive signal is stopped
right when the malfunction is determined.
Air mix actuator drive signal is stopped right
when the malfunction is determined.
Airflow mode actuator drive signal is stopped
right when the malfunction is determined.
Malfunction already exists when IG SW
turned to ON
←
←
←
←
2
.
←
←
←
←
←
After the IG SW is at ON, the air mix actuator
drive signal is again output normally.
After the IG SW is at ON, the airflow mode
actuator drive signal is again output normally.
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