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Old 11-21-2014, 08:52 AM   #1
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COLD start/Allison problem

I just started my Cat engine in 1 degree OS temp.
Started fine... but after 15 min fast idle "warmup", (water temp 180 degrees),the Allison will not shift out of "N"...(even after 30 minutes).

When idling the shift pad displays "N" and "N", as normal

However, when "D" is pressed the "Select" LED displays a flashing "D", (accompanied by a beep,beep beep alarm).....and the "Monitor" LED displays a steady "N".

(A flashing "R" is displayed if "R" is pressed).

Pressing "N" restores the display to "N" and "N".

Any help or suggestions?

Mel
'96 Safari, MD3060 Allison
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Old 11-21-2014, 09:03 AM   #2
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Is it off fast idle? It shouldn't go in gear above idle.
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Old 11-21-2014, 09:05 AM   #3
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Mel,
Make sure the Idle RPM is back to normal ( 800 to 900 RPMs)
Otherwise the Allison TPS (Throttle Position Sensor) will not permit the shifting into gear.
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Old 11-21-2014, 09:37 AM   #4
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OOPS

OOPS!
Stupid me!
The Allison will not shift out of N at "fast idle".
Sorry for that post.
I apologize.
Mel
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Old 11-21-2014, 10:04 AM   #5
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No Sweat- Been there and done that too.
Glad your rolling !
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Old 11-21-2014, 10:15 AM   #6
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Quote:
Originally Posted by mel s View Post
OOPS!
Stupid me!
The Allison will not shift out of N at "fast idle".
Sorry for that post.
I apologize.
Mel
A good reminder to those of us usually in warm places !
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Old 11-21-2014, 10:57 AM   #7
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I learn something just about every time I read this forum. You're not stupid if you are learning.


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Old 11-21-2014, 12:31 PM   #8
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I learn something just about every time I read this forum. You're not stupid if you are learning.


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Oh ... I don't know ... I keep learning the same things ... over ... and over ....
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Old 11-21-2014, 06:46 PM   #9
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My memory is just as good today as it ever was. It's just a lot shorter.

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Old 11-23-2014, 09:12 PM   #10
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My memory is just as good today as it ever was. It's just a lot shorter.

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Amen to that.
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Old 11-23-2014, 10:21 PM   #11
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Quote:
Originally Posted by mel s View Post
OOPS!
Stupid me!
The Allison will not shift out of N at "fast idle".
Sorry for that post.
I apologize.
Mel
Well, if it helps, I once tried to push the "economy" button without looking (heavy traffic @50 mph). Nothing happened, I glanced down and the indicator light was flashing R !!! I immediately pushed D and grabbed my nitro pill bottle. I'm sure glad the Allison is smarter than I.
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Old 11-23-2014, 10:40 PM   #12
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Doesn't applying the brake, cancel out the fast idle , on your coach ?
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Old 11-24-2014, 07:37 AM   #13
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Doesn't applying the brake, cancel out the fast idle , on your coach ?
Skip426
Normally it does... but it did not that morning, (because of the below zero OS temperature??)

My mistake was NOT realizing that it was idling fast and that all I needed to do was simply press the "fast idle button" to drop the idle RPM....which DID work in that cold temperature.

It's again working automatically when the brakes are applied. (in OS temps of 10 degrees F +).

Mel
'96 Safari 3126 Cat, MD3060Allisin
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