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Old 09-01-2011, 07:02   #1 (permalink)
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2003 Navigator, compressor doesn't inflate air bag suspension

My brother is based in Europe and owns a 2003 Navigator.
His Navigator has front suspension problems.
The compressor doesn't inflate the front air bags anymore. There is no signal coming from the air suspension modules (front left and right) to the relay and on to the compressor. His mechanic has tested the compressor and it is good to go. The relay was working, they burned it by mistake while testing. His mechanic inflated the air suspension bypassing the hardware and it took 12 days for the front to slowly start deflating so a leak in the rubber is not the problem. The 'air suspension' light goes on as soon as the ignition is turned on. The computer analysis returns a 'no diagnostic' signal.
He has the following questions for you all experts:
-is the air suspension module (3C142) the problem?
-is it common for the height sensors (151-9/151-10 front left and right) of a 2003 Navigator to fail?
His Navigator is based in France and converted to LPG. He uses it to pull a boat.
Many thanks in advance.
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Old 12-03-2012, 18:46   #2 (permalink)
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Re: 2003 Navigator, compressor doesn't inflate air bag suspension

I know this is an old post but maybe someone can benefit from this information on 2003 - 2006 EXPO or NAV air suspension

It is sad no one replied to this post -- since probably 99% of Ford vehicle owners with Air Suspension have experienced similiar problems ----I guess they do not have time for anybody else's issue but their own or they took to a shop and never found out what he shop did.

Since they were able to manually air the system up and the air compessor/motor was tested and works and the relay is good. The problem is related to/with the ASM (Air Suspension Module) or faulty connection between the ASM and the relay base.

On the 2003 Expo and Nav you can remove the Relay.. If you measure voltage at each of the Female Connectors of the plug in Base, where you plug the relay in, the 2 largest connectors will measure 12 volts (top connector) and "0" volts (closest to front of vehicle) and the small connector on the left will measure 12 volts. The Connector on the right is to the ASM, if it measures 3.0 volts are more the ASM is sensing an error fault in the system or possiblly a BAD ground connection at the ASM ---this wire has to go to ground to activiate the relay----If this connection does not connect to ground through the ASM or if this wire connection is open --IE broken or loose connection the compressor motor will not run

The connector to the ASM has a DB/YE(Yellow Stripe) Wire connecting it to the ASM. CAUTION: you should not Ground this connection manually unless you disconnect your ASM or it will be damaged.

Do you know if they grounded this connection and jumpered the compressor connection to manually fill the suspension?

If you are interested in more info contact me

Regards
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