1999 Ford Expedition Vehicle Lean

ADJUSTMENTS
INFLATING/DEFLATING AIR SUSPENSION SYSTEM
NOTE:Inflating or deflating air suspension system is necessary to adjust ride height.

Turn ignition on. Connect New Generation Star (NGS) tester (007-00500) to Data Link Connector (DLC). DLC is located under steering column. Select proper vehicle, year and engine type.
Select AIR SUSPENSION CONTROL MODULE under active command mode. Turn on following active commands as necessary:
Select VENT FRNT to lower front of vehicle.
Select LIFT FRNT to raise front of vehicle.
Select VENT REAR to lower rear of vehicle.
Select LIFT REAR to raise rear of vehicle.

The only way to alter the ride height is via diagnostic computer !

AIR SUSPENSION CONTROL MODULE
Air suspension control module may also be referred to as simply control module or 4 Wheel Air Suspension (4WAS) module. Air suspension control module is located behind right center of instrument cluster panel. Module controls air compressor and all system solenoids. Control module also provides power to height sensors. Control module outputs are controlled by monitoring height sensors, Vehicle Speed Sensor (VSS), steering sensor, acceleration input, door ajar signal, 2 transfer case signals (on 4WD models) and brake switch feedback signals. Control module conducts all fail-safe strategies and incorporates self-diagnostic and communication capabilities.
AIR SHOCK ABSORBER
Two system-specific front air shock absorbers are used in the 4WD system. Air shock absorber is not repairable. If one fails, both should be replaced.