Before starting any work, you must disable the mechanism through the article center. The message center is located on the instrument cluster and also displays crucial information through a constant monitoring of auto systems. Choose display attributes on the message center for a display screen of sta
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tus behavior by a quick chime. The device will additionally notify the driver the potential automobile problems with a display screen of mechanism warnings adhered to by a long indicator chime. The message facility is supplied to disable and allow the vehicle air suspension system. Once the driver elects come disable the air suspension system, the message center sends a blog post over the High speed Controller Area Network (HS-CAN) bus to the wait suspension module. As soon as the post is received, the waiting suspension module will take no further action to inflate or deflate the air springs. The mechanism will default to ON when the ignition an essential is cycled.

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Turn the ignition to the on position, close every doors and also clear warnings.Select the SETUP control duty on the blog post center.Select the waiting SUSPENSION function to screen the current status that the waiting suspension system.Press the RESET manage to turn the air suspension off or ON.

The waiting bag and also shock absorber have the right to be separated. Make sure you know the orientation of the upper mount and air spring before you take it the assembly apart. To deflate the spring, eliminate the air line from the solenoid, remove the retaining clip and also rotate the solenoid counter-clockwise. Air need to rush out. The o-rings ~ above the shaft and also upper mount should constantly be replaced and also lubricated through a silicone-based spray lubricant. These aid to seal the unit from exterior debris. If friend are just replacing the waiting spring, make certain the body of the shock is very clean.
Operation

The system uses two ride elevation sensors an installed to the behind axle. The voltage calculation decreases (goes native high come low) together the suspension device raises the vehicle. The output voltage is between 0.5 and 4.5 volts. These signals are sent out to the auto Dynamics Module (VDM).

Testing this sensors deserve to be done v a meter, border or scan tool. Through a meter, the is possible to observe changes in the voltage or resistance.

The air bags have solenoids placed to the next that allow the bladder come either fill or compress. Over there is no air reservoir on this system.

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When the an essential is in the ~ above position, the load leveling feature instantly makes adjustments to the automobile height so the the vehicle is always at target elevation and continuous front-to-rear vehicle perspectives are kept when loads change.
The system will collection C- or chassis codes that will be collection if the device notices abnormal behavior. This codes commonly start C17XX. Criteria because that these codes commonly involve a ride elevation sensor detecting to adjust in suspension elevation if the compressor or solenoids room activated.

Calibration

Scan tools are necessary for functioning on part systems. Some magnified scan tools have the right to observe PIDs because that the air ride system like valve operation, modes and vehicle position. Some brand-new vehicles, like GM, have actually a calibration process for the ride regulate system.

The Expedition’s ride height and also trim deserve to be calibrated with a scan tool. No calibrating the ride height can an outcome in suspension and tire damage. To do this the auto must be on a level surface. The ride height is measured and also the scan tool deserve to vent or to fill the correct bag.

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Compressor Problems

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The heart of an wait ride mechanism is the piston, piston ring and cylinder. What hastens the failure of the piston ring is heat. The device is dry and no lubricants safeguard the piston. The VDM regulate modules regulate just how long the compressor will certainly run to keep temperatures in a designated range. The manage module will certainly look in ~ ambient temperature and other factors to identify when and also how lengthy the compressor have to run to manage the heat.