Mazda 626 - Page 563

TROUBLESHOOTING
STEP
INSPECTION
ACTION
3 CHECK TO SEE WHETHER PROBLEM IS IN
AIR MIX ACTUATOR +5 V SIGNAL OR
POTENTIOMETER GND SIGNAL
• Is air mix actuator set at MAX HOT and airflow
mode actuator at VENT?
(Verify position of air mix actuator link and
airflow mode actuator link.)
Yes Go to next step.
No Go to Step 8. (Set actuators at MAX COLD and
DEFROSTER.)
*4
CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN WIRING
HARNESS (BETWEEN CLIMATE CONTROL
UNIT AND AIR MIX ACTUATOR) OR
ELSEWHERE
• Turn ignition switch to ON position.
• Is there voltage of
approximately 5 V at
climate control unit connector (16-pin) terminal
2N (+5 V signal)?
Yes Repair wiring harness between climate control
unit and air mix actuator, then go to Step 19.
No Go to next step.
*5 CHECK TO SEE WHETHER MALFUNCTION IS
IN AIR MIX ACTUATOR (SHORT TO GROUND)
OR ELSEWHERE
• Disconnect air mix actuator connector.
• Is there voltage of approximately 5 V at
climate control unit connector (16-pin) terminal
2N (+5 V signal)?
Yes Inspect air mix actuator, then go to Step 19.
No Go to next step.
*6 CHECK TO SEE WHETHER MALFUNCTION IS
IN AIRFLOW MODE ACTUATOR (SHORT TO
GROUND) OR ELSEWHERE
• Disconnect airflow mode actuator connector.
• Is there voltage of
approximately 5 V at
climate control unit connector (16-pin) terminal
2N (+5 V signal)?
Yes
Inspect airflow mode actuator, then go to Step 19.
No Go to next step.
*7
CHECK TO SEE WHETHER MALFUNCTION
(SHORT TO GROUND) IS IN CLIMATE
CONTROL UNIT OR WIRING HARNESS
(BETWEEN CLIMATE CONTROL UNIT AND
AIR MIX ACTUATOR)
• Disconnect climate control unit connector
(16-pin).
• Is there continuity between climate control unit
connector (16-pin) terminal 2N (+5 V signal)
and ground?
Yes
Repair wiring harness between climate control
unit and air mix actuator, then go to Step 19.
No Replace climate control unit, then go to Step 19.
*8
CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUITY) IS IN WIRING
HARNESS (BETWEEN CLIMATE CONTROL
UNIT AND AIR MIX ACTUATOR) OR
ELSEWHERE
• Disconnect climate control unit connector
(12-pin) and air mix actuator connector.
• Is there continuity between climate control unit
connector (12-pin) terminal 11 (potentiometer
GND signal) and air mix actuator connector
terminal C?
Yes Go to next step.
No
Repair wiring harness between climate control
unit and air mix actuator, then go to Step 19.
*9 CHECK TO SEE WHETHER MALFUNCTION
(SHORT TO B+) IS IN CLIMATE CONTROL
UNIT OR WIRING HARNESS (BETWEEN
CLIMATE CONTROL UNIT AND AIR MIX
ACTUATOR)
• Turn ignition switch to ON position.
• Test voltage at climate control unit connector
(12-pin) terminal 11 (potentiometer GND
signal).
• Is voltage approximately 12 V?
Yes Repair wiring harness between climate control
unit and air mix actuator, then go to Step 19.
No Replace climate control unit, then go to Step 19.
U-29