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Suspension system off 2006 Ford Expedition - Light says suspension system off- car is riding low. Compressor not coming on

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Common failure is the air compressor relay,But in some rare cases the relay will fail due to the faulty air compressor.You may wanna have a shop diagnose the issue before you replace any parts.

Posted on Jan 31, 2010

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02 Ford Expedition Air Ride Suspension


The compressor may be leaking and in need of an overhaul. Had that happen on a Buick Sport Wagon. Remember those?

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I have an 2004 Ford Expedition Eddie Baurer, Check Air Suspension light is on. The suspension is not working at all truck rides very low and bounces every time a bump is hit, what could be wrong?


Any part of the air ride suspension system could have failed.
I would replace the air suspension, with a conversion, such as strutmaster or similar product,other wise you have to diagnose your current system and repair.

Oct 04, 2010 | 2004 Ford Expedition

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Air ride suspension diagram, I need to locate the compressor the system wont hold air


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Aug 23, 2010 | 2000 Ford Expedition

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Suspension - back suspension makes car look like low rider


Number one reason the rear sags in a air suspension expedition is because of a 5 dollar or so relay. Their is a TSB addressing this issue with the relay being the fix

Number 2 reason is the compressor is bad.

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1 Answer

EXPEDITION REAR AIR RIDE PROBLEM


do you have just rear air suspension? here's rear only. 4 wheel different. Deler an run a diagnostic test with WDS machine and get fault codes.
-------------------------------------------------------------------------------------
The air suspension system is designed to improve ride, handling and general vehicle performance for static, on-road and off-road driving conditions:
  • Ride is improved by using an air type spring (the soft ride is inherent).
  • Handling is improved by maintaining constant vehicle attitude.
The system consists of unique rear air springs, the air compressor, air lines, air spring solenoids, height sensor, air suspension control module, attachments and associated signals derived from both driver and road inputs. With these components and signals, the air suspension control module commands changes in vehicle height that are necessary for the load leveling features.
The load leveling feature rear air suspension (RAS) systems shall automatically make adjustments in vehicle height so that the vehicle is always at trim height and constant front-to-rear vehicle attitudes are maintained over the expected load range of the vehicle. Adjustments in height that are necessary to correct height differences between the vehicle's left and right sides for the RAS system shall be restricted to what can be reliably achieved with one air suspension height sensor.
The system uses one air suspension height sensor, a steering sensor, generic electronic module (GEM) and other vehicle sensors to measure driver and road inputs. The system changes vehicle height using an air compressor, two air lines and the use of air springs with air spring solenoids.
The air suspension system holds vehicle height when the rear hatch or any door is opened. The system stores rear vehicle height the moment any open door is detected. The system then maintains this height regardless of the addition or removal of a load. The system will return to its commanded height when all doors are closed or the vehicle speed exceeds 16 km/h (10 mph).
----------------------------------------------------------------------------------------
Air Suspension Height Sensor
One air suspension height sensor is mounted on the vehicle. The air suspension height sensor sends a voltage signal to the air suspension control module. The output ranges from approximately 4.75 volts at minimum height (when the vehicle is low or in full jounce), to 0.25 volts at maximum height (when the vehicle is high or in full rebound). The air suspension height sensor has a useable range of 80 mm (3.2 in) compared to total suspension travel of 200-250 mm (8 to 10 in) at the wheel. Therefore, the air suspension height sensor is mounted to the suspension at a point where full rear suspension travel at the wheel is relative to 80 mm (3.2 in) of travel at the air suspension height sensor. The air suspension height sensor is attached between the No. 5 frame crossmember (upper socket) and the panhard rod (lower socket).
When the air suspension height sensor indicates that the rear of the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the air springs. When the sensor indicates that the rear of the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the air springs to lower the vehicle back to its trim height level
------------------------------------------------------------------------------
  • Uneven vehicle height
  • Circuitry.
  • Rear pneumatic fault.
  • Air compressor assembly.
  • Air suspension control module.
  • Go To Pinpoint Test I .

Feb 21, 2009 | 2001 Ford Expedition

1 Answer

Rear Suspension 2002 Ford Expedition


they make aftermarket spring kits for air ride removal. you can also get used parts from an expedition without air ride. My personal opinion there isn't a great difference in ride quality the only advantage the air ride has is that it will raise the vehicle ground height when in 4x4

Nov 25, 2008 | 2002 Ford Expedition

1 Answer

1997 expedition 2 wheel drive air suspension problem


There are ride height sensors in the rear that send a signal to the ride height/load leveling control module, one of these ,may be defective. Have Ford dealer run an active test of the system, they will find out what the part is that has failed, otherwise you are guessing, that equals wasted $$$

Nov 04, 2008 | 2000 Ford Expedition

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