Temperature control actuator located at heater unit regulates the temperature by the procedure as follows. Signal from control unit adjusts position of temp door by operating temp motor. then temperature will be regulated by the hot/cold air ratio decided by position of temp door
The ECM sets DTC B2406 if the air mix actuator dosen‘t move to intended position within 40sec (The ECM attempts to move the temp door for a 2 second duration at a frequency of 3 times every 20 seconds before storing a DTC.)
Item
Detecting Condition
Possible Cause
Monitor Strategy
? Voltage check
? Poor connection of connected part
? Open circuit in harness
? Short circuit in harness
? Faulty DR Air Mix potentiometer
? Faulty A/C Control Unit
Threshold value
?< 0.1V
Detecting time
? 0.3sec
FAIL SAFE