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Old 09-26-2021, 02:15 PM   #1
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PSI instruments going wild

I have a 2014 Fleetwood Expedition (Class A diesel). While driving down the highway, the two PSI instruments on the dash jump from 125 PSI to zero. After about one minute or so, they jump back to 125 PSI. This goes on the entire time I am driving. There is no functional loss of the equipment that uses air. I have pushed on the wires behind the instruments to make there is no loose connections. I have spoken to Fleetwood and Freightliner and they are as lost as I am. Any ideas?
Thank you
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Old 09-26-2021, 04:59 PM   #2
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Well it would appear that Freightliner has changed the gauge package again ; the diagnostic info I have from Freightliner on the gauge package they started using in 2007 indicated the air pressure gauges are manual , not electronic so no use me posting that pdf here .

Do you get a low pressure alarm too; or just the gauge movement ?

Over the years , I've collected Freightliner documents on diagnosing gauge operation on three Freightliner systems , did Freightliner offer to send you any kind of a pdf on the gauge package ?
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Old 09-26-2021, 06:37 PM   #3
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Quote:
Originally Posted by Skip426 View Post
Well it would appear that Freightliner has changed the gauge package again ; the diagnostic info I have from Freightliner on the gauge package they started using in 2007 indicated the air pressure gauges are manual , not electronic so no use me posting that pdf here .

Do you get a low pressure alarm too; or just the gauge movement ?

Over the years , I've collected Freightliner documents on diagnosing gauge operation on three Freightliner systems , did Freightliner offer to send you any kind of a pdf on the gauge package ?
The low pressure alarm did not activate, only gage movement.
The only thing Freightliner offered was a "I don't know, call Fleetwood"
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Old 09-27-2021, 09:59 AM   #4
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Quote:
Originally Posted by paulglaser View Post
The low pressure alarm did not activate, only gage movement.
The only thing Freightliner offered was a "I don't know, call Fleetwood"
Was that at a Freightliner dealer or from the Freightliner help line ?

Freightliner made the air system , the gauge package and all the wiring between the sensors and the dash; somewhere at Freightliner there is info on diagnostics and repair.

Call the help line with your chassis serial number , tell them you want , wiring schematics , wiring diagrams and any ; and all ; info on the gauge system they have.
Because the gauge movement doesn't trigger the alarm , there has to be either ; different sensors for the alarm or a module that interprets the sensor input and is sending signal to the gauges ( that's being interrupted causing your issue )and not to the alarm.

Did you get any info on the gauge package in a Freightliner chassis manual with the coach ?
Do they still refer to the gauge package as LBCU ( Light Bar Control Unit )?
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Old 10-01-2021, 01:55 PM   #5
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Thanks for your response. I wish I could say the same for the Freightliner help line. I asked for the wiring diagram and they said they could not send it cause it would be about 100 pages. The manual I have does not give any details on the instruments. The technician at Freightliner said that I could remove the top panel above the instruments to get a better look of the instruments. When I asked her to clarify, she simply told me to take it to a Freightliner dealer. In frustration, I removed the panel and, as she said, I could see the wires clearly. I found a "disconnected" wire assembly with a connector on the end that I THOUGHT came out of the instrument. I followed all of the wires and think that all the instruments are tied together with this wire assembly and this was the end of the line to be used for tying in future instruments. Although each PSI instrument had one open female connection, there were no 'loose' wires. I did push on all of the connectors going into the instruments. I turned on the engine and the PSI instruments went to 150 PSI. I shut the engine off after a few minutes since the instruments didn't move. It should be mentioned that on my return trip on Wednesday, the instruments only jumped once and remained at zero most of the 185 mile trip. I leave again on 10/3 and will also call Fleetwood to see if they will help.
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Old 10-01-2021, 06:07 PM   #6
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Well things have changed over the years the wiring schematics and diagrams for my coach probably total 15 pages .
Did the " not so helpful " line give you an indication of the gauge system acronym ? Are they still calling it LBCU ( Light Bar Control Unit ) ?

As I mentioned , I have a pdf on diagnostics for the LBCU , but , it refers to the air pressure gauges as manual ( air pressure supplied , directly to the gauge through a small tube) not an electronic gauge .

Here's the pdf , just in case any info crosses over to your gauge system.
Attached Files
File Type: pdf LBCU info and diagnostics.pdf (220.3 KB, 9 views)
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Old 10-06-2021, 03:37 PM   #7
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My 2007 did the same thing. I just bought the dash out enough to get at the gauges. I just unplugged each electrical fitting and replugged them back in. End of the problem and has been good for 3 years now
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Old 10-06-2021, 04:24 PM   #8
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Quote:
Originally Posted by Skip426 View Post
Well things have changed over the years the wiring schematics and diagrams for my coach probably total 15 pages .
Did the " not so helpful " line give you an indication of the gauge system acronym ? Are they still calling it LBCU ( Light Bar Control Unit ) ?

As I mentioned , I have a pdf on diagnostics for the LBCU , but , it refers to the air pressure gauges as manual ( air pressure supplied , directly to the gauge through a small tube) not an electronic gauge .

Here's the pdf , just in case any info crosses over to your gauge system.
Skip, In your PDF it looks like the air pressure tube goes to a transducer not directly to the gauge. If all the connections on the gauges are good maybe the connection from the transducer to the gauge isn't making solid contact?
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Old 10-10-2021, 08:15 PM   #9
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Well, I finally got an answer from Freightliner that my 2014 Fleetwood has a LBCU (Light Bar Control Unit).
There are no tubes going to the PSI instruments. As suggested, I removed the connectors from the back and reinstalled them. No difference. Both Fleetwood and Freightliner do not have a direct solution.
During this last trip, I turned on the ignition and no radio, no back up camera, no house AC, and no wipers. Called Fleetwood and they had me test the voltage at the circuit box in the storage unit. We also checked fuses F6, 7, 8, and 19, with no problems. The technician had me go into the rig and turn on the "Park" button. The radio and back up camera came on so at least I could drive home safely. I look forward to any more suggestions, but I think I'll be taking to Velocity Truck Center here in Phoenix.
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