Intake door located at heater unit controls the inlet of car. It contains intake motor that changes intake door position and potentiometer that monitors position of intake door. When driver operates the intake switch, ECU receives mode signal from intake switch and operates intake door motot to turn intake door to intended position. (with FRE mode signal, intake door is closed and with REC mode signal, intake door is opened)
In operation, potentiometer delivers intake door position transformed into voltage value to A/C ECU .
The ECM sets DTC B1208 if there is an open circuit or poor connection in the Intake actuator signal harness.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage check | ● Poor connection of connected part ● Open circuit in signal/power harness ● Short circuit in signal/power harness ● Faulty passenger air mix actuator |
Threshold value | ●< 0.1V | |
Detecting time | ● 0.3sec | |
FAIL SAFE | ● Setting mode : REC Fix at REC position ● Setting mode : Except REC Fix at FRE position |
※ Voltage value of Intake potentiometer as a function of position of Intake door.
Door position | Voltage | Error Detecting Condition |
FRE | 0.3±0.15V | Undervoltage : 0.08V or less |
REC | 4.7±0.15V | Overvoltage : 4.9V or more |
