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DTC 21

id070200803300

DTC 21 | Airflow mode actuator (potentiometer) (present)
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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)

Diagnostic Procedure

STEP | INSPECTION | ACTION
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1 | • Inspect airflow mode actuator. • Is it okay? | Yes | Go to the next step.
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.
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.
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.
No | Repair wiring harness. (Open circuit)