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Old 02-26-2014, 21:16   #1 (permalink)
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Rear Suspension Down Air Ride Diagnosis

I just had one come in and made an easy to follow diagnostic video to see why that air compressor is not coming on and why your back end is down to the ground. Air ride truly is simple to diagnose and fix if you understand the system. This procedure applies to Expedition and Navigator pre 2003. Hope this helps!

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Old 06-04-2014, 23:30   #2 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

ok here is my question... kind of long

We have a 04 Lincoln Nav 4x4

We drove to Florida from Oklahoma we stopped in arkansas and got something to eat, When we came out the front passenger was deflated... We started the car and the compressor kicked on and it aired up then it dropped again... compressor kicks on and back up then deflates then says check air ride, when we pulled up to our hotel the nav was riding so ruff our kids were bouncing everywhere.

thinking it would air back up on the way home we just left it parked until it was time to go.... we were wrong the compressor runs for a min then shuts off and check air suspension comes on... Air sus ran completely flat all the way home. BUMPY!

replaced passenger air strut, replaced all front air lines and connecters and installed new compressor... started it up and the compressor ran for 2 min and shut off neither the front or back aired up and my wife is becoming fed up! at this point it's to bumby to drive

PLEASE HELP! should have converted to springs but im to much into this now
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Old 06-05-2014, 19:04   #3 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

From the sounds of things, I'd first look for a large air leak. A 50-50 mix of water and dish soap in a spray bottle, run the compressor and start spraying the pressurized components.
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Old 06-06-2014, 10:34   #4 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

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Originally Posted by Joshua74133 View Post
ok here is my question... kind of long

We have a 04 Lincoln Nav 4x4

We drove to Florida from Oklahoma we stopped in arkansas and got something to eat, When we came out the front passenger was deflated... We started the car and the compressor kicked on and it aired up then it dropped again... compressor kicks on and back up then deflates then says check air ride, when we pulled up to our hotel the nav was riding so ruff our kids were bouncing everywhere.

thinking it would air back up on the way home we just left it parked until it was time to go.... we were wrong the compressor runs for a min then shuts off and check air suspension comes on... Air sus ran completely flat all the way home. BUMPY!

replaced passenger air strut, replaced all front air lines and connecters and installed new compressor... started it up and the compressor ran for 2 min and shut off neither the front or back aired up and my wife is becoming fed up! at this point it's to bumby to drive

PLEASE HELP! should have converted to springs but im to much into this now
Did you pull the battery negative and clear the codes in the 4was module? While pumping the truck doesn't move at all even if you look close? Was the pump new from Ford?
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Old 06-06-2014, 16:53   #5 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

Im going to clear codes right now.... problem im having is i bought a new relay and i for the life of me cant figure out where it goes. i have researched and have watched video after video where the 03 relay is located but cant find where it is on my 04
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Old 06-08-2014, 13:49   #6 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

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Im going to clear codes right now.... problem im having is i bought a new relay and i for the life of me cant figure out where it goes. i have researched and have watched video after video where the 03 relay is located but cant find where it is on my 04
In 04 they changed it to a regular ole relay high current type and it is mounted on the air ride compressor itself in a little relay box. I have never seen one of those fail though. Pull washer fluid jug up and you will see it underneath it by battery.
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Old 06-08-2014, 16:33   #7 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

Old Australian Fords (Fairmonts, Fairlanes and LTDs) also had a self diagnosis feature thus: with the ignition or engine on flick the interior light switch on and off three times quickly or flick the driver's interior light door switch 3 times in 1 second and it will go through a process where it raises, lowers then raises to normal ride height and flashes the self levelling suspension light a number of times to indicate the fault code.
0 Flashes: warning lamp failure (bulb, wiring etc) or diff module height sensor power supply failure.
1 Flash: compressor failed. Car stock in low position due to mechanical fault or obstruction, car overloaded (so compressor has insufficient power to raise), diff sensor link missing, broken or disconnected, air leak in lines or shockies, failed height sensor ground, failed height sensor power supply, failed compressor relay.
2 Flashes: Compressor exhaust valve failure, height sensor thinks vehicle is raised and will not lower (mechanical failure of obstruction) compressor exhaust valve circuit, failed diff module.
3 Flashes: Height sensor module failure.
4 Flashes: System tests OK.
Lamp always on (no flashes): failed control unit.


Do the US Fords have the same self diagnosis feature?
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Old 06-08-2014, 19:11   #8 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

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Old Australian Fords (Fairmonts, Fairlanes and LTDs) also had a self diagnosis feature thus: with the ignition or engine on flick the interior light switch on and off three times quickly or flick the driver's interior light door switch 3 times in 1 second and it will go through a process where it raises, lowers then raises to normal ride height and flashes the self levelling suspension light a number of times to indicate the fault code.
0 Flashes: warning lamp failure (bulb, wiring etc) or diff module height sensor power supply failure.
1 Flash: compressor failed. Car stock in low position due to mechanical fault or obstruction, car overloaded (so compressor has insufficient power to raise), diff sensor link missing, broken or disconnected, air leak in lines or shockies, failed height sensor ground, failed height sensor power supply, failed compressor relay.
2 Flashes: Compressor exhaust valve failure, height sensor thinks vehicle is raised and will not lower (mechanical failure of obstruction) compressor exhaust valve circuit, failed diff module.
3 Flashes: Height sensor module failure.
4 Flashes: System tests OK.
Lamp always on (no flashes): failed control unit.


Do the US Fords have the same self diagnosis feature?
Never seen any of ours flash, but that may be tha case on the real early units I don't see, the ones that has special diagnostic port in the trunk and you uses the super tester with morse code.
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Old 06-22-2014, 08:39   #9 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

ok so i got the suspension to work for about 3 weeks... just the other day back to front not working right.

i think it's the height sensor but man 277.00 bucks for a thought is a expensive guess... is there any way to see if that’s what the problem is for sure?
when I disconnect the lever arm from the sensor the sensor arm just drops whereas the others if I disconnect the lever arm the sensor arm just stays in it’s place.
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Old 06-22-2014, 09:21   #10 (permalink)
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Re: Rear Suspension Down Air Ride Diagnosis

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Originally Posted by Joshua74133 View Post
ok so i got the suspension to work for about 3 weeks... just the other day back to front not working right.

i think it's the height sensor but man 277.00 bucks for a thought is a expensive guess... is there any way to see if that’s what the problem is for sure?
when I disconnect the lever arm from the sensor the sensor arm just drops whereas the others if I disconnect the lever arm the sensor arm just stays in it’s place.
That is a good indication that the internal wiper arm is worn out we used to change the front height sensors all the time on the newer air rides where as the old ones never had problems. Only way to tell for sure is with a scan tool to see the height sensor voltage the module is seeing.
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