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.
When the vehicle leveling is performed, the compressor presses the air and makes it into high-pressure air. And it is supplied to each air-spring. For controlling the height of a vehicle, the ALS ECU controls each valve and the air is charged into each airspring or a reservoir. And the exhaust valve is used to let the air out of ALS system.
The ALS ECU monitors the exhaust valve which is connected to the atmosphere and if it is detected as a fault in the valve, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitoring the exhaust valve |
•
Open or Short in the exhaust valve circuit
•
Faulty exhaust valve(inside compressor ASS'Y) |
Threshold value |
•
Short to battery side: When the valve is ON, the battery voltage is detected for more than 0.2 second.
•
Open/ Short to ground side: When the valve is OFF, the zero voltage is detected for more than 0.2 second. | |
Fail-Safe |
•
The level control of a vehicle is Inhibited.
•
The warning lamp is activated. |
