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Service light on Allison only at full throttle

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The title sums up my issue.  1998 Monaco Windsor.  The "service" indicator comes on in the shift pad but only at full throttle.  I have a mechanical engine, no ecm on my engine.  Just noticed it yesterday, everything seems to be shifting ok, but the light keeps coming on.

Any ideas?

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43 minutes ago, Mark Underhill said:

Not sure how to check them.

On mine I press the Up & Down arrows twice and it will start displaying codes.  You'll see D1 and then the code, I think it will display 4 codes.

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What model transmission do you have? 

I found this post on IRV2 regarding TPS on a rig of your vintage (maybe). 


Here's a link to trouble shooting manual, to a search for "Throttle Position Sensor" and it will show you where it is mentioned https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://yardtruck.com/wp-content/uploads/2020/04/MD3060_Troubleshooting_Manual.pdf&ved=2ahUKEwjRjM2tuveFAxXa4skDHdoiAQ8QFnoECBoQAQ&usg=AOvVaw35SPf4_ie7W1nUJnK12QdE

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