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Old 03-26-2012, 11:24 AM   #1
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Air gauges getting squirrely

It seems whenever I travel rough roads, real rough (which there are a lot of until I get out of Louisiana) my air gauges jockey back and fourth between 115 and zero quickly. The warning light and buzzer come on as well. It only happens when hitting real rough spots. It only lasts a few seconds and quickly rights itself. I am confident I am not loosing actual air pressure to the coach, it appears to be a gauge / sensor problem. I have been told it may be a digital sensor. But there is actually air lines going to the gauges in the dash. I have also been told it may be a MDV sensor also.

It is a 2009 Phaeton 40QTH / Freightliner. Anyone have any ideas? I appreciate any ideas, thanks in advance for your imput.
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Old 03-26-2012, 12:13 PM   #2
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Check for a short--the last air pressure guage weirdness I experienced was from the guage light which was shorting against the guage frame.
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Old 03-26-2012, 01:01 PM   #3
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I had the exact situation. They (Freightliner) replaced the LBCU under warranty and that solved my issue. If you haven't done so yet, call the Freightliner Help desk and they can help diagnose your problem. 1-800-FTL-HELP.
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Old 03-27-2012, 09:21 AM   #4
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Thanks Jim.

I have not contacted Freightliner myself but the local Tiffin dealer is contacting them on my behalf.
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Old 04-03-2012, 12:07 PM   #5
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Thanks Jim.

I have not contacted Freightliner myself but the local Tiffin dealer is contacting them on my behalf.

Let us know what you find out. I have the exact same problem on my 2008 Phaeton QSH Freightliner chassis. I found out that all the guages on the dash are daisy-chained together and I suspected it is one of those connections. I was able to duplicate the problem when I wiggled some of them. I cleaned them all and so far it has not re appeared. Not sure if it is solved yet, because I have only had it out on one short trip, but time will tell.
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Old 04-09-2012, 03:33 PM   #6
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I think I have it solved. I found the connection to the warning light a little loose. Not real loose but it appeared to snap in a little further when I pushed on it. We just returned from a 3200 mile trip there and back from the Grand Canyon and I had no issues. And the construction through Dallas was really rough in some spots, before it would have acted up in such conditions. Keeping my fingers crossed. Thanks again for the replies.
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Old 11-01-2012, 09:38 PM   #7
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ChucknTammy, I just now came across your post. I have experienced that exact same problem under the same "rough road" conditions. Have you had any more issues or occurrences since you snapped in the warning light? Just wondering.....
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Old 11-05-2012, 06:19 PM   #8
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ChucknTammy, I just now came across your post. I have experienced that exact same problem under the same "rough road" conditions. Have you had any more issues or occurrences since you snapped in the warning light? Just wondering.....
It seemed to get better, now it is doing it again. Not all the time but it does still do it. I am bringing our coach to Red Bay in a few weeks to have body work done. ( I was rear ended ) While they have it I will have it looked at. I will post what I find out.
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Old 11-06-2012, 07:49 AM   #9
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Thanks, I will be looking forward to what they do (or do not) find. Ours is intermittent as well...... quite maddening when it happens!
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Old 03-14-2013, 06:04 PM   #10
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Quote:
Originally Posted by ChucknTammy View Post
It seems whenever I travel rough roads, real rough (which there are a lot of until I get out of Louisiana) my air gauges jockey back and fourth between 115 and zero quickly. The warning light and buzzer come on as well. It only happens when hitting real rough spots. It only lasts a few seconds and quickly rights itself. I am confident I am not loosing actual air pressure to the coach, it appears to be a gauge / sensor problem. I have been told it may be a digital sensor. But there is actually air lines going to the gauges in the dash. I have also been told it may be a MDV sensor also.

It is a 2009 Phaeton 40QTH / Freightliner. Anyone have any ideas? I appreciate any ideas, thanks in advance for your imput.
I had the exact same problem with my 2008 Phaeton on Freighliner chassis. Called the freightliner help desk and the guy there said it was a common problem. The guages and LBCU have jumpers that are daisey chained on the back of the LBCU and guages. The jumpers which just plug in get loose because they are incorrectly sized or do not fit tightly. He had a new set of redesigned jumpers sent to my local Freightliner chassis shop and he changed them out. The new jumpers had to be pushed in pretty hard. That was 3 years ago and no problems since.
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Old 03-14-2013, 06:54 PM   #11
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Vhuck! I have a 2001 zephyr and had the same problem stope in a Frightliner in Tucson Az. Had talk to them on the road already so when the wife and I arrived they started right in. We started ooking for the computer the controls the air gages it not really a computer but thats what they called it .The tech didn't know where it was installed ,he said it might be in front,midshils or in the back it was in the back under the bed under a pannel I'd been in there before and never knew it was there.I was surrprised!! he changed out the unit in about ten min and we were on our way. the caution he had for me was that the coach need to know it's got pressure or it could lock the breaks up. I hope I've helped Joaxaca!!
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Old 03-14-2013, 10:44 PM   #12
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Vhuck! I have a 2001 zephyr and had the same problem stope in a Frightliner in Tucson Az. Had talk to them on the road already so when the wife and I arrived they started right in. We started ooking for the computer the controls the air gages it not really a computer but thats what they called it .The tech didn't know where it was installed ,he said it might be in front,midshils or in the back it was in the back under the bed under a pannel I'd been in there before and never knew it was there.I was surrprised!! he changed out the unit in about ten min and we were on our way. the caution he had for me was that the coach need to know it's got pressure or it could lock the breaks up. I hope I've helped Joaxaca!!

A 2001 FL chassis has a computer system that they called "System 3". The "black box" that you are looking for will be somewhere in the back. Your body builder mounted it. Those units were noted for having cold solder joints on the air gauge terminals. A little research on this forum will reveal a repair method (cheap) or you can replace the computer (no so cheap).

I believe that the OP's chassis was a MMDC system, and the computer will be somewhere in the front. If it happens to be a LBCU system, the light bar is the computer.
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