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, a height sensor is set up between an axle and an chassis body. And this sensor measures the height of an vehicle and gives it to ALS ECU. This height sensor converts the movement of rod into a voltage value. And ALS ECU receives the height sensor signals and becomes aware of a vehicle's height.
The ALS ECU monitors the output signals of height sensor and if it is out of normal range, this DTC is set.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
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Monitoring the output signals of height sensor |
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Open or short in the left height sensor
•
Damaged lever/ link/bracket of height sensor
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Faulty left height sensor | |
Threshold value | Case 1 |
•
When the output signal is less than 0.15V or more than 4.85V | |
Case 2 |
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When the changes of output signal is below 0.05V. ( The vehicle speed is 35 km/h and the vehicle height is below 72 mm, and the engine speed is above 1000 rpm.)
•
When the changes of output signal is below 0.05V at controlling a vehicle height. | ||
Case 3 |
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When the output of the sensor is less than the specified value (0.5 + offset)
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When the output of the sensor is more than the specified value (4 + offset) | ||
Fail-Safe |
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In a case of one sensor's failure - The self-leveling is enabled
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In a case of two sensors' failure - Inhibition of a vehicle level control
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The warning lamp is activated. | ||
