The ALS is the abbreviation for "Auto Leveling System". This ALS system automatically controls the height of a vehicle level according to road condition. So it improves riding comfort and steering stability. Among components of the ALS system, the temperature sensor is installed inside of the compressor ASS'Y and measures its temperature. It's signal is sent into ALS ECU. This sensor uses the NTC(Negative Temperature Coefficient) thermistor whose resistance changes with the temperature. So, as the temperature decreases, the resistance rises. Conversely, as the temperature increases, the resistance falls.
The ALS ECU monitors the output signals of temperature sensor and if the output voltage of the temperature sensor is too low or there is no change in the condition of charging air into a reservoir tank, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitoring the sensor's output |
•
Open or short in the temperature sensor circuit
•
Faulty temperature sensor(Inside of compressor ASS'Y) |
Threshold value |
•
When the output signal of the temperature sensor is below 0.23V
•
When the change of temperature is below 1 ℃ at charging the air into a reservoir tank for more than 30 seconds | |
Fail-Safe |
•
Restrict an operation of the compressor to a certain period. Only self-leveling is enabled.
•
The warning lamp is activated. |
