Mazda 2002 6 Workshop Manual page 1211

STEP
• Disconnect airflow mode actuator connector.
2
• Is resistance between terminals 1U and 1I of
climate control unit connector (24-pin) more
than 387 ohms?
• Disconnect climate control unit connector
3
(24-pin).
• Is resistance between terminals 1B and 1I of
climate control unit connector (24-pin) less
than 4.8 kilohms?
• Is resistance between terminals 1B and 1U
4
of climate control unit connector (24-pin) less
than 4.2 kilohms?
End Of Sie
DTC 19
DTC 19 Air mix actuator (potentiometer) system inspection
• Air mix actuator malfunction
• Climate control unit malfunction
POSSIBLE
• Open circuit between air mix actuator and climate control unit
CAUSE
• Short circuit between air mix actuator (terminal C) and climate control unit (terminal 1U: 24-pin)
Diagnostic Procedure
STEP
• Inspect air mix actuator.
1
• Is it okay?
• Disconnect climate control unit connector
2
(24-pin) and air mix actuator connector.
• Is there open circuit between following
terminals of climate control unit connector
(24-pin) and air mix actuator connector?
— 1B—B
— 1U—C
— 1I—A
• Is there short circuit to ground between
3
terminal 1U of climate control unit connector
(24-pin) and terminal C of air mix actuator
connector?
End Of Sie
DTC 21
DTC 21 Airflow mode actuator (potentiometer) system inspection
• Airflow mode actuator malfunction
• Climate control unit malfunction
POSSIBLE
• Open circuit between airflow mode actuator and climate control unit
CAUSE
• Short circuit between airflow mode actuator (terminal C) and climate control unit (terminal 1W: 24-pin)
Diagnostic Procedure
STEP
• Inspect airflow mode actuator.
1
• Is it okay?
• Disconnect air mix actuator connector.
2
• Is resistance between terminals 1W and 1I of
climate control unit connector (24-pin) more
than 387 ohms?
• Disconnect climate control unit connector
3
(24-pin).
• Is resistance between terminals 1B and 1I of
climate control unit connector (24-pin) less
than 4.8 kilohms?
• Is resistance between terminals 1B and 1W
4
of climate control unit connector (24-pin) less
than 4.2 kilohms?
End Of Sie
U–60
ON-BOARD DIAGNOSTIC
INSPECTION
INSPECTION
INSPECTION
Yes Go to next step.
No Repair wiring harness. (Short circuit)
Yes Go to next step.
No Repair wiring harness. (Open circuit)
Yes Replace climate control unit.
No Repair wiring harness. (Open circuit)
Yes Go to next step.
No Replace air mix actuator.
Yes Repair wiring harness.
No Go to next step.
Yes Repair wiring harness.
No This system is normal at present. (Erase the past failure
from memory.)
Yes Go to next step.
No Replace airflow mode actuator.
Yes Go to next step.
No Repair wiring harness. (Short circuit)
Yes Go to next step.
No Repair wiring harness. (Open circuit)
Yes Replace climate control unit.
No Repair wiring harness. (Open circuit)
ACTION
A6E857001038W12
ACTION
A6E857001038W13
ACTION