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Air suspension went out, air motor. Truck is low.

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You can get inexpensive but good replacement parts at americanairsuspension.com the pump will go bad if the drier isn't replaced every few years. most people never do. the air springs also should be sprayed with silicone spray. the pump can go bad and blow fuses, there are also relays on the air lines, or leaky bags.

Posted on Sep 05, 2010

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1 Answer

Air suspension is to height


Bad height sensor or air suspension compressor has died? If you hear the pump, then it might be the sensors. If there's nothing, could be a blown fuse or the system was swtiched off (switch in the trunk)

Dec 07, 2013 | 2004 Lincoln Navigator

1 Answer

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...


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.

Jun 09, 2017 | 2000 Ford Expedition

1 Answer

HOW TO LET AIR OUT OF LEVELING SYSTEM REAR


first you need to disable turn electrical power off to the air suspension system then remove air spring solenoid valve electrical connector then remove air line to the air valve solenoid. you need have have raise vechicle safely support vechicle with suspension is fully down with no load.WARNING TURN OFF DISABLE ELECTRICAL POWER TO AIR SUSPENSION IF NOT UNEXPECTED INFLATION OF THE AIR SPRINGS COULD CAUSE SHIFTING OF THE VECHICLE WHICH IS DANGEROUS CAUSE INJURY TO YOU ALSO VECHICLE, DONT WORK ALONE IF YOU ARE WORKING UNDERNEATH VECHICLE HAVE FRIEND OR SOME ONE AROUND THAT RULE A PERSONAL MECHANICS OR ANY BODY WORKING ON VECHICLES.

Sep 17, 2012 | Cars & Trucks

1 Answer

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?

Sep 08, 2012 | Cars & Trucks

1 Answer

I have a 2006 toyota tacoma, FWD, SBDC with the towing package. The truck has been sitting in my garage for about 4 hours and when I just went outside, I heard what seemed to me a small motor running. ...


If you have air suspension on the rear axle then that could be an air pump which is restoring pressure to the reservoir. Normally this would not take very long so it is possible that you may have a leak or loose connection in the air suspension lines.

Cheers.

Apr 07, 2011 | 2006 Toyota Tacoma

1 Answer

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

1 Answer

Lincoln is very low and air suspension not working. No light is on indicating any problems and system shows air suspension is ok.


my air bag went bad and the samething happend i changed the shockes and did away with the air it was cheaper

Sep 21, 2010 | 2004 Lincoln Navigator

1 Answer

Low rear suspension on my 1999 Cadillac DeVille


Do you hear your compressor running? It may be that it is getting tired and ready to burn out on you. I replaced the compressor twice on my Deville before I found that there were so many holes and nicks in the air bags and it was going to cost me almost $1500 to fix the whole system. I went online and found Strutmasters. I got a non air conversion kit for my car and love it. Saved me money and headache.

May 20, 2010 | 1999 Cadillac DeVille

1 Answer

99 lincoln naviagator that bounces bad and sits low in rear<


your truck comes with suspension airbag for a smooth right..all lincoln naviagator come with it..if your take it the shop and they forget to disable that before they lift it up..most likely they blown the airbag for your suspension...those air suspension are rear spring for your truck

Apr 21, 2010 | 2001 Lincoln Navigator

1 Answer

Air suspension light came on I turned the car off light went off, then I noticed the rear end of my car was low. What could that be?


It is your air ride suspension. It could be the air bags, the sensors, compressor, wires and many other things. What I did was bought an after market coil spring suspension and converted it from the air ride suspension. The air ride is lovely but costly. It is hard to diagnose that air ride suspension without spending a lot more money then you want. I suggest getting an after market converter kit, but I would make sure it has the sensor plug so that your warning light on your dash goes out....otherwise it will be on forever!

Jan 10, 2010 | 2000 Lincoln Town Car

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