Question about 2000 Ford Expedition

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I have a 99 expedition, air ride suspension went out. Changed the air compressor and still will not air up. Checked the relay and seems to be working. One other time this happened and friend changed a little plastic piece by the compressor, not sure what it was so cant check it. Anyone know what this piece could have been? Maybe pressure switch or direct inlet air filter? Not sure where those are located? Cant get ahold of friend and this girl needs back on the road!!

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David Straughan

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  • Ford Expert
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Https://www.strutmasters.com/suspension-parts/ford/ford-expedition/1999-ford-expedition/

Posted on Sep 25, 2017

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Jeff Armer

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  • Ford Master
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Your best bet take it an have it diagnosed ! This is computer controlled an may have DTC'S - diagnostic trouble codes stored !
C1724 Air Suspension Height Sensor Power Circuit Failure Air Suspension Control Module GO to Pinpoint Test F . C1726 Air Suspension Rear Pneumatic Failure Air Suspension Control Module GO to Pinpoint Test G . C1760 Air Suspension Rear Height Sensor High Signal Circuit Failure Air Suspension Control Module GO to Pinpoint Test H . C1770 Air Suspension Vent Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test I . C1790 Air Suspension LR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test J . C1795 Air Suspension RR Air Spring Solenoid Output Circuit Failure Air Suspension Control Module GO to Pinpoint Test K . C1830 Air Suspension Compressor Relay Circuit Failure Air Suspension Control Module GO to Pinpoint Test L
Symptom Chart Condition Possible Sources Action

  • No communication with the air suspension control module
  • CJB Fuse 4 (15A), 6 (5A) and 20 (5A).
  • Circuitry.
  • Air suspension control module.
  • Air suspension switch.
  • GO to Pinpoint Test A .

You replaced a part that you probably didn't need !
  • The compressor is inoperative
  • BJB Fuse 109 (50A).
  • Air compressor assembly.
  • Circuitry.
  • Air suspension relay.
  • GO to Pinpoint Test Q .

There is a lot to this system an guessing as to what the problem is ,isn't the way to fix it.
Measure the voltage between air compressor relay C1000 Pin A, Circuit 1053 (LB/PK), harness side and ground.
  • Is the voltage greater than 10 volts?
Yes GO to Q3 .

No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
Measure the resistance between air compressor C1000 Pin B, Circuit 538 (GY/RD), harness side and air compressor assembly C194M Pin 4, Circuit 538 (GY/RD), harness side.
  • Is the resistance less than 5 ohms?
Yes GO to Q4 .

No REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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). Replace the air suspension height sensor as a unit.
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.
Compressor Relay
The compressor relay is energized by the air suspension control module to allow high current to flow from the battery to the compressor motor.
  • A solid state relay is used in the air suspension system for air compressor control. The relay incorporates a custom power metal oxide semi-conductor field effect transistor (MOSFET) and ceramic hybrid circuitry. The relay switches high current loads in response to low power signals and is controlled by the logic of the air suspension control module.
  • Air Suspension Control Module
    NOTE: The 4WAS air suspension control module is used for the RAS system. The internal processor recognizes external circuitry to determine if it is installed in a 4WAS or a RAS equipped vehicle.
    NOTE: The air suspension control module is calibrated with information from the air suspension height sensor. A new or exchanged air suspension control module requires a ride height adjustment calibration process to be performed.
    The air suspension control module controls the air compressor motor (through a solid state relay), and the air spring solenoids. The air suspension control module also provides power to the air suspension height sensor. The air suspension control module controls vehicle height adjustments by monitoring the air suspension height sensor, vehicle speed, a steering sensor, acceleration input, the door ajar signal, transfer case signals, and the brake pedal position (BPP) switch. The air suspension control module also conducts all fail-safe and diagnostic strategies and contains self-test and communication software for testing the vehicle and related components.
    The air suspension control module monitors and controls the air suspension system through a 32-pin two-way connector. The air suspension control module is keyed so that the air suspension control module cannot be plugged into an incorrect harness. There are two sides of the harness connection to the air suspension control module. Each is uniquely colored and keyed to prevent reversing the connections.

Posted on Jun 09, 2017

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5 Related Answers

rangerdth

  • 9 Answers

SOURCE: Air Suspension plomlem

1. make sure the switch is on (under the passenger side dash board). 2. check to make sure the relay is good (black little box under the right front bumper. 3. there are two (that I know of) switches/sensors.  1 is behind the left front tire.  The other is up behind the spare tire.  Taking the spare tire off gives you tons of room to work with.  The sensors look like mini shock absorbers with black rubber and can be compressed and pulled easily by hand.  Moving those will simulate the suspension going up and down and should trigger the compressor. 4. if the compressor doesn't come on (and all the above is fine) it sounds like your compressor is bad and should be replaced.  I got one from Arnott Industries in Florida and they have been very nice to work with so far.

Posted on Aug 06, 2008

Anonymous

  • 15 Answers

SOURCE: air ride suspension 1997 ford expedition

If the compressor is working and actually pumping out air, might need to check your lines dont have a leak by disconnecting them from the bags. If pressured air is making it to the end of the line, then bags may need to be inspected and one or both replaced. However it is more likely that the lines are leaking or the compressor pump needs a service. Just a new set of rings in the unit. Good luck, hope it helps.

Posted on Dec 31, 2008

Anonymous

  • 58 Answers

SOURCE: my air suspension compressor is

It sounds to me like your compressor got killed. What probably happened is that the airbag got a hole or tiny crack in it so the compressor has to work extra hard because it is like blowing up a balloon with a hole in it. Therefor the airbag killed the compressor. I would recommend going to strutmasters.com and taking a look at our conversion kits. these convert you from the airbag to a powder coated American made steel coil spring that is guaranteed to last the life of the car. I added the link below so you can check it out.
http://www.strutmasters.com/ford-suspension-parts-s/75.htm I hope I was of some help
Good Luck!!!

Posted on May 06, 2009

Anonymous

  • 12 Answers

SOURCE: Rear suspension on 1998 Ford EXP wont raise

More than likely you have an inner leak in one of the strut assem. in rear.

Posted on Jun 17, 2009

Anonymous

  • 8 Answers

SOURCE: 2000 ford expedition air suspension

just replaced air bag suspension on a 2000 ford expedition, but the check suspension light stil is on how do I disable it.

Posted on Sep 03, 2009

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1 Answer

2010 Ford Expedition Can someone tell me where the air suspension compressor relay is? Not talking about a relay in the fuse box but the other one that has two bolt holes in it and a pigtail running in it....


I have not looked at your part but there usually is a plastic panel cover on one of the rear quarter panels inside the rear cargo area. Sometimes it is paired with the inertia switch relay.

Wanted to inform you that some of the better scanners can diagnose Air suspension problems. Some of the big auto-parts stores offer free scans but few use the better scanner. Call ahead.

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Location of rear air suspension relay 99 expedition


The system is fused only, it is located in the underhood fuse box.
Fuse #109 50A** Air Suspension Compressor

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I changed my air compressor for my air ride suspension and now i have no power to my compressor. i changed the compressor relay as well.


check the fuses and the switch in drivers side rear compartment to make sure there is power to it.

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Back end of my 2001 Ford Expedition FWD, Eddie Bauer, was dragging. Had diagnostic test run and found out it needed a new air ride compressor. Had compressor installed, but compressor continues to run...


The compressor should only run until the rear suspension reaches the desired height. If it continues to run after the suspension has raised to ride height then you may have a leaking air bag/solenoid or line. If you dont have any leaks it is possible the EVO(air suspension module} or relay is at fault.

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my compressor for my air ride suspension went out,so i changed it and now i cannot get power to my compressor.

Aug 23, 2010 | 2000 Ford Expedition

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


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.

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Suspension - back suspension makes car look like low rider


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Jul 10, 2009 | 2000 Ford Expedition

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