ALC Sensor

The ALC sensor is an electronic device. The following is controlled by the ALC sensor:

• The Real Suspension Leveling Air Compressor
• The Exhaust Solenoid Valve

The sensor circuitry provides a 20 second delay before either circuit can be completed to prevent falsely actuating the compressor or to prevent falsely actuating the solenoid valve circuits during normal ride motions.

The sensor also limits the compressor run time or the solenoid valve energized time to a maximum of 255 seconds. This time limit function is necessary to prevent continuous compressor operation in the case of a severe system leak or in the case of a continuous exhaust valve operation. Turning the ignition off and on resets the electronic timer to renew the 255 second maximum run time. The sensor is located in the rear of the vehicle mounted to the underbody. The actuator arm of the sensor attaches to the rear suspension by a link.