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. The reservoir tank is one of ALS system's components and its capacity is 2.5 liters. The ALS system stores the compressed air in the reservoir tank. and then during stopping, when the ALS ECU gets a vehicle leveling signal by a ECS switch or it performs the self-leveling control, the compressed air in the reservoir tank would be used. Also, the reservoir tank is installed for a quick control of a vehicle leveling.
The ALS ECU monitors the inner pressure for a normal operation and if the pressure is below a certain value at charging the air into the reservoir tank, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
At the air charging, monitoring the inner pressure |
•
Faulty pressure sensor
•
Faulty compressor
•
Air leakage
•
Stuck reservoir valve |
Threshold value |
•
When the inner pressure is maintained below a certain value for more than 30 seconds, at charging the air into the reservoir tank. | |
Fail-Safe |
•
The level control of a vehicle is Inhibited.
•
The warning lamp is activated. |
