Temperature sensor, evaporator A/C (621)
| Temperature sensor, evaporator A/C (621) |
| Location |
Temperature sensor, evaporator A/C (621) .
| Main function |
The sensor provides information regarding the current temperature of the air surrounding the evaporator.
| Type |
The NTC sensor is located in a bracket.
| Connection |
Sensor pin 1 has an internal ACC unit ground connection via pin 39 (K42) and sensor pin 2 receives a 5 V feed from pin 22 (K42) via an integrated 10 kOhm resistor in the ACC unit.
NTC resistor characteristics allow the resistance to decrease as the temperature rises. This means that the voltage fed over the resistor also decreases as the temperature rises. The voltage level from the A/D sensor is converted and is then available in digital form. The digital voltage level is then converted to a temperature value which is stored in the ACC unit operating memory. Voltage levels near 0 V or 5 V are determined as circuit faults.
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