This one has me going in circles.
Driving northbound down the I5 Grapevine grade, just after reaching the bottom getting off the retarder and on the gas, the beeper behind the dash sounds for a couple of minutes, then goes silent.
All the gauges look fine.
I took it to Valley Power, an Allison shop, and the computer shows no stored fault codes. The dipstick shows a good level, and the atf is clear, clean, fresh smelling Transynd.
I got my vmsPC working. Today on then same run, one shorter downgrade before the last one, the retarder temp did momentarily hit 308, then dropped to 260. No beeping. On the final long downgrade, I carefully keep it in 4th and lightly use the retarder. Temp is mostly under 250, once hitting 260. At the bottom of the grade the beeper sounds again, just like before. I have everything monitored on the vmsPC, and everything is normal. At the next stop, I check for fault codes, and there are none.
So....what is going on here? I don't see this on any other downgrade.
Tom, just a thought. Is there some sort of radio transmitter in the area? I wonder if some stray RF is getting into your system somehow.
Low air pressure?
It's the only beeper I have under the dash on my '90.
You have a much later coach than mine, so it is probably different. Mine sounds for a lot of different things. The one thing that caused it to sound when it should not was a bad antenna up switch. Maybe it is something that is unrelated to the grade, that is if other things can make it beep.
It seems like every year is a bit different. James T. at FOT might be able to get you a document that tells what makes the beeper beep. My 2001 has an apparent blue box failure that makes the pressure gauges read zero, the red lights to come on and the beeper to beep. I put a switch in the annunciator wiring to silence it but I miss it to help me to remember to turn off the turn signal.
Roger
seems like a few of us are haviong beeping problems.
On the way back from Mexico for the first 2 days it kept coming on for different lentghs of time then the 3rd day nada. The 4th day just a couple of times after I noticed that when it beeped I took my foot off the throttle a bit and it stopped almost right away. Every time same thing. While the beeping was happening the "check engine" light came on. VMSpc said nothing and no change in readouts on computer. That night I tied up the wiring harness that goes down the injector side so it did not touch engine and no more beeping? Coincidence or?? Any thoughts?
JohnH
I wonder if the batwing antenna might have a mercury switch to chime when it is up and the engine running. Might be the grade and pavement are just right to set it off. For what it's worth, I am always in the number three lane doing 55 when this happens, at exactly the same place.
Check the ground wire bus bar in the dash. Sometimes these short out requiring cleaning.
John,
When you let up on the throttle torque goes down and the engine probable moves a little.
You also say you tied up a wire bundle on the engine and think that helped.
So if the problem comes back in the future I think I would start the search at that wire bundle.