The Air mix actuator(Temperature actuator) located at heater unit. It contains temp motor that changes temp door position and potentiometer that monitors position of temp door. The Air mix actuator(Temperature actuator) regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp door by operating temp motor and then temperature will be regulated by the hot/cold air ratio decided by position of temp door. In operation, potentiometer delivers temp door position transformed into voltage value to A/C ECU.
The ECM sets DTC B1246 if there is a short to power in the driver air mix actuator signal harness.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage check | ● Open circuit in harness ● Short circuit in harness ● Faulty DR Air Mix actuator |
Threshold value | ●＞4.9V | |
Detecting time | ● 0.3sec | |
FAIL SAFE | ● setting temperature : 17℃-24.5℃ fix at max. cooling position ● setting temperature : 25℃-32℃ fix at max. heating position |
※ Voltage value of Air Mix potentiometer as a function of temp door position.
Door position | Voltage | Error Detecting Condition |
Max. cool | 0.3±0.15V | Undervoltage : 0.08V or less |
Max.warm | 4.7±0.15V | Overvoltage : 4.9V or more |
