2003 Lincoln Navigator c1991

Adrean Diagnostician Bakersfield, California Posted   Latest  

goodmorning Everyone. I am working on this 2003 Lincoln Navigator , the truck has electronic suspension. And it had code c1991 and c1725 .. I checked it out and found the rf air shock was leaking due to the oring on the solenoid not being installed , so i Install the oring and no more leaks . Car now airs up the front . But the check suspension message will come up with code c1991 .. I tried with autel and snap on to relearn the height calibration , But I’m having trouble completing this and clearing the code . Any one that has successfully done this with snapon or autel or do I need a ngs or ids ? Thanks in advance 

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Robert Mobile Technician
Newark, Delaware
Robert
 

Does your scan tool have the option run the trim set function and a Pneumatic test? I I have had this very issue before where you fix the problem but the message and code won't go away. I want to say that after you run the pneumatic test you you should be able to clear the code. I've never tried using anything but ids on them.

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Martin Instructor
Burnaby, British Columbia
Martin
 

Adrean, since the "O" ring was not installed, there must be an underlying reason. Although I have zero experience with the vehicle, I'd wonder if perhaps an aftermarket solenoid has been installed of dubious quality. Possibly IDS will be needed to complete a re-calibration of the height sensor. "Googling" might just yield some useful information, because it seems that this is not an isolated

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Adrean Diagnostician
Bakersfield, California
Adrean
 

They had replaced the front air shock . And they didn’t installed the new oring . Just had a hard time doing the procedure it shows on google but I will try again

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Glen Technician
Arthur, Illinois
Glen
 

Did you already read TSB 03-13-02 ?

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Chris Technical Support Specialist
Commack, New York
Chris
 

That tsb is a good source for general information on this system.

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Chris Technical Support Specialist
Commack, New York
Chris
 

The ride height calibration should be able to be set with FJDS. You can use a J2534 Pass through such as the Cardaq Plus2 for this function. If you can not raise and lower the suspension with active commands on a scan tool, it will not pass the test. I have found that sometimes if the raise/lower time is too long (weak compressor or clogged vent) it will not pass. I had also had the chance to

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Jason Instructor
Nanticoke, Pennsylvania
Jason
 

It may sound simple and stupid but I had a 2003 Navigator one time that would not relearn trim heights and would not complete calibration and clear the codes after the repair on a sensor was completed. It turns out there was nothing wrong with the vehicle it was more so my process of calibration. First thing was my snap on modis did an auto detection for the vehicle and populated it as a 2004

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