DTC 21


DTC 21	Airflow mode actuator (potentiometer) (present)
POSSIBLE CAUSE	• Airflow mode actuator malfunction • Climate control unit malfunction • Open circuit between airflow mode actuator and climate control unit • Short circuit between airflow mode actuator (terminal C) and climate control unit (terminal 1W: 24-pin)


STEP	INSPECTION		ACTION
1	• Inspect airflow mode actuator. • Is it okay?	Yes	Go to the next step.
1	• Inspect airflow mode actuator. • Is it okay?	No	Replace airflow mode actuator.
2	• Disconnect air mix actuator connector. • Is resistance between terminals 1W and 1I of climate control unit connector (24-pin) more than 387 ohms?	Yes	Go to the next step.
2		No	Repair wiring harness. (Short circuit)
3	• Disconnect climate control unit connector (24-pin). • Is resistance between terminals 1B and 1I of climate control unit connector (24-pin) less than 4.8 kilohms?	Yes	Go to the next step.
3		No	Repair wiring harness. (Open circuit)
4	• Is resistance between terminals 1B and 1W of climate control unit connector (24-pin) less than 4.2 kilohms?	Yes	Replace climate control unit.
4		No	Repair wiring harness. (Open circuit)