General Information

Component Location





General Description

The Evaporator sensor located on heater unit detects the core temperature. It is a negative type thermistor whose resistance is inversely proportional to temperature. Evaporator sensor transforms measured temperature into voltage value and delivers it to A/C ECU. when core temperature is blow threshold value, A/C ECU interrupts compressor relay power, in order to prevent evaporator freezing by excessive cooling.

DTC Description

The ECM sets DTC B1241 if there is a short circuit in evaporator sensor signal harness or the measured voltage value of the sensor is less than the threshold value (0.1V)

DTC Detecting Condition





Schematic Diagram





Signal Waveform

** Resistance value of evaporator sensor as a function of temperature.