The Evaporator sensor located at heater unit detects the core temperature and interrupts compressor relay power, in order to prevent evaporator freezing by excessive cooling. It is a negative type thermistor whose resistance is inversely proportional to temperature
The ECM sets DTC B1241 if there is a short circuit in evaporator sensor signal harness or the measured resistance value of sensor is less than threshold value(about 0.9㏀)
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage check | ● Short circuit in harness. ● Fault Evaporator sensor ● Fault A/C Control Unit |
Threshold value | ● < 0.1V | |
Detecting time | ● 0.3sec | |
FAIL SAFE | ● Control with the vlaue of -2℃ |
Temperature(℃) | Resistance(㏀) | Temperature(℃) | Resistance(㏀) |
-10 | 13.6 | 15 | 3.9 |
0 | 8 | 30 | 2 |
5 | 6.2 | 40 | 1.3 |
10 | 4.9 | 50 | 0.9 |
