B0268

DTC B0268












CIRCUIT DESCRIPTION
The recirculation actuator is an electronic device that incorporates a stepper motor and a feedback potentiometer. The HVAC control module controls the recirculation door position by sending a control signal to the actuator. The signal's value is dependent upon the desired mode that the vehicle occupants select. While the actuator moves, the potentiometer produces the actual door position signal that is sent to the HVAC control module. The HVAC control module continues to command the actuator to move until the desired value is equal to the actual value. The door directs airflow through the outlets which the vehicle occupants selected.

CONDITIONS FOR RUNNING THE DTC
-> The ignition is ON.
-> Ignition voltage is between 9-16 volts.
-> An attempt was made in order to change the position of the recirculation actuator.

CONDITIONS FOR SETTING THE DTC
-> The actual recirculation door position differs from the commanded recirculation door position by 4 counts or more.

ACTION TAKEN WHEN THE DTC SETS
-> The recirculation actuator is considered stalled, and the HVAC control module will command the mode actuator to stop rotation (2.5 V).

CONDITIONS FOR CLEARING THE DTC
-> If the HVAC control module no longer detects a condition, then the DTC will become history.
-> The history DTC will clear after 50 ignition cycles without a condition.
-> The DTC can be cleared with a scan tool.

DIAGNOSTIC AIDS
-> A dead zone exists in a range from 10 counts above the maximum mode door position to 10 counts below the minimum mode door position. When the mode door Actual Data parameter is within the dead zone, the DTC will not set. If the Commanded Data parameter differs from the Actual Data parameter by 4 counts or more outside the dead zone, the DTC will set.
-> A damaged or broken recirculation door or a damaged or broken actuator can cause this DTC to set.