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.
The ALS ECU monitors the valve relay for a normal operation and if it is detected as a fault in the valve relay, this DTC is set.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Monitoring valve relay |
•
Short in the valve relay circuit
•
Faulty valve relay(inside ALS ECU) |
Threshold value |
•
Short to battery side: When the valve relay is OFF, the output voltage is detected at more than 3V.
•
Short to ground side: When the valve is ON, the output voltage is detected at less than 3V. | |
Fail-Safe |
•
The level control of a vehicle is Inhibited.
•
The warning lamp is activated. |
