Mark Underhill Posted May 5 Share Posted May 5 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? Link to comment Share on other sites More sharing options...
Reka52 Posted May 5 Share Posted May 5 Check oil level and change filters Link to comment Share on other sites More sharing options...
Benjamin Posted May 5 Share Posted May 5 Any codes? Link to comment Share on other sites More sharing options...
Mark Underhill Posted May 5 Author Share Posted May 5 57 minutes ago, Benjamin said: Any codes? Not sure how to check them. Link to comment Share on other sites More sharing options...
jacwjames Posted May 5 Share Posted May 5 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. 1 1 Link to comment Share on other sites More sharing options...
jacwjames Posted May 5 Share Posted May 5 Here is a guide on how to check for codes for the different shifters. It also shows the codes themselves. Allison all codes.pdf 1 Link to comment Share on other sites More sharing options...
Mark Underhill Posted May 5 Author Share Posted May 5 Ok D1 then 21 then 23. Link to comment Share on other sites More sharing options...
Solution jacwjames Posted May 5 Solution Share Posted May 5 38 minutes ago, Mark Underhill said: Ok D1 then 21 then 23. Page 25 of the attachment I posted says 21 & 23 says THROTTLE POSITION SENSOR, FAILED HIGH Link to comment Share on other sites More sharing options...
jacwjames Posted May 5 Share Posted May 5 What model transmission do you have? I found this post on IRV2 regarding TPS on a rig of your vintage (maybe). https://www.irv2.com/forums/f123/throttle-position-sensor-527263.htmlts2973 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 2 Link to comment Share on other sites More sharing options...
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