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Old 07-03-2022, 08:19 PM   #1
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Audible alert from Allison panel

On our past several trips, after the first mile or so, we began getting a soft audible tone (a soft tone like a digital bell) . I can tell it's coming from the Allison panel. No visual dash alarms. Allison fluid level reports OK. No adverse characteristics or conditions. Audible stops when placing in Neutral. I'm at a loss - ideas what this is?
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Old 07-03-2022, 08:21 PM   #2
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What chassis is your coach on ?
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Old 07-03-2022, 09:07 PM   #3
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Must be a Tiffin, perhaps on a Freightliner chassis, since this is also posted on the Tiffin forum site.
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Old 07-03-2022, 11:14 PM   #4
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I don't know what chassis the older Allegro Bus uses, but Freightliner uses a soft bell sound for issues. It should be showing something on the dash. I've never heard of Allison using any type of sound indicators for issues.
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Old 07-03-2022, 11:34 PM   #5
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2000 Tiffin ; if built on Freightliner chassis , most likely a bad sensor for the park brake not released warning ( since it quits in neutral).

That vintage of Freightliner chassis had redundant sensors for park brake release ; one for the buzzer , one for the light.
Buzzer on and no light , one sensor is bad .
Light on and no buzzer , the other sensor is bad .
Both buzzer and light on,= low air pressure at the park brake release chamber.

Mr.Jeff ; if you'll confirm your chassis , I'll post pictures of the sensor and where to find it.
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Old 07-04-2022, 01:23 PM   #6
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Thanks for the replies, sorry for not noting frame and model - 2000 Allegro Bus, Freightliner chassis, Cummins engine
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Old 07-04-2022, 01:39 PM   #7
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If the code is coming from the Allison transmission, use the shift pad (engine off, key on) to check for DIAGNOSTIC CODES.
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Old 07-04-2022, 05:13 PM   #8
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Quote:
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Thanks for the replies, sorry for not noting frame and model - 2000 Allegro Bus, Freightliner chassis, Cummins engine
Ok ; for a test , when the noise is present idling in gear set the park brake , if the noise gets a little louder or stays the same ; release the park brake quickly . Even do it a couple of times ; if the noise quits momentarily on the release of the park brake .
The pressure sensor is faulty .
Inside the drivers side frame rail above the LR wheel brake chamber there is the manifold pictured below attached to a black plastic tube to the park brake release chamber . There are two sensors , two wire sensor is for the park brake on light ; the three wire sensor is for the park brake on in gear buzzer.

Highlighted in this air system diagram. (pdf)
Attached Thumbnails
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Attached Files
File Type: pdf Freightliner air system diagram 1999.pdf (357.3 KB, 3 views)
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Old 07-05-2022, 04:19 PM   #9
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Skip - Thanks for the information!! Awesome info. I'll crawl up under there in the cool of the morning.
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Old 07-05-2022, 05:50 PM   #10
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Skip - Thanks for the information!! Awesome info. I'll crawl up under there in the cool of the morning.
Remember to have solid blocking to the frame ; do not rely on levelers .
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Old 07-05-2022, 10:25 PM   #11
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Indeed!
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