The Evaporator sensor is located on the AC/heater boxand it detects the evaporator core temperature. When the core temperature is below the threshold value, the A/C ECU interrupts the compressor relay in order to prevent evaporator freezing.
The Air conditioner Control Module sets DTC B1242 if Evaporator sensor has been detected over 4.9V for 0.3 seconds.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Voltage check |
•
Open in signal circuit
•
Short to battery in signal circuit
•
Faulty Evaporator sensor
•
Faulty Air conditioner control Unit |
Enable Conditions |
•
IG KEY ON | |
Threshold value |
•
Evaporator sensor has been detected over 4.9V for 0.3 seconds | |
Failsafe |
•
Control with the value of -2℃(28.4℉) |
Temperature(℃/℉) | Resistance(㏀) | Temperature(℃/℉) | Resistance(㏀) |
-10/-14 | 43.3 | 20/68 | 12.1 |
0/32 | 27.6 | 30/86 | 8.3 |
10/50 | 18 | 40/104 | 5.8 |
