David Hunt Posted March 22, 2021 Share Posted March 22, 2021 (edited) I have a 2019 mt07 that all of a sudden won't idle down below 3000 rpm and shows a SD 37 code. What could cause this? Edited March 23, 2021 by David Hunt Wrong code Link to comment Share on other sites More sharing options...
Premium Member DewMan Posted March 22, 2021 Premium Member Share Posted March 22, 2021 I'm not seeing a code 27 on the short list I have. Are you 100% sure that's what it showed? 1 DewMan Just shut up and ride. Link to comment Share on other sites More sharing options...
Jerzee Posted March 22, 2021 Share Posted March 22, 2021 67 is the idle speed control Self Diagnostic. It mentions something about 'resetting the learning data' by setting the run / kill switch from kill to run three times in 5 seconds. I assume this means there is bad data in the ECU and this may clear it? Just a quick scan of the manual for 2018... 1 1 Link to comment Share on other sites More sharing options...
David Hunt Posted March 23, 2021 Author Share Posted March 23, 2021 I will double check the code. I could be mistaken. Thanks Link to comment Share on other sites More sharing options...
David Hunt Posted March 23, 2021 Author Share Posted March 23, 2021 I'm sorry. It's SD 37 code it's showing Link to comment Share on other sites More sharing options...
Triple Jim Posted March 23, 2021 Share Posted March 23, 2021 My manual doesn't list that code, but some searching turns up some stuff that might help. 2 1 Link to comment Share on other sites More sharing options...
Premium Member DewMan Posted March 23, 2021 Premium Member Share Posted March 23, 2021 @Triple Jim appears to be correct. 5d__37 Idle Speed Control (ISC): If ISC is not heard, then ISC is defective. If ISC is heard, then component other then ISC unit is defective 1 DewMan Just shut up and ride. Link to comment Share on other sites More sharing options...
Triple Jim Posted March 23, 2021 Share Posted March 23, 2021 I'm not sure I should be praised as correct yet. @DewManI think what you posted refers to testing the ISC. You put in that code and listen for its operation. But maybe the display is suggesting that test. (?) 1 Link to comment Share on other sites More sharing options...
Premium Member DewMan Posted March 23, 2021 Premium Member Share Posted March 23, 2021 2 minutes ago, Triple Jim said: I'm not sure I should be praised as correct yet. @DewManI think what you posted refers to testing the ISC. You put in that code and listen for its operation. But maybe the display is suggesting that test. (?) I'm sure one of the issues listed in the links you posted are the most likely culprits. DewMan Just shut up and ride. Link to comment Share on other sites More sharing options...
Triple Jim Posted March 23, 2021 Share Posted March 23, 2021 I find it strange that my 2020 service manual doesn't list that code. Link to comment Share on other sites More sharing options...
David Hunt Posted March 23, 2021 Author Share Posted March 23, 2021 Thank you triple Jim. I looked at the older post and found my problem. The backup 2 (10amp) fuse was blown. And thank you to all the people who commented to help 2 Link to comment Share on other sites More sharing options...
Triple Jim Posted March 23, 2021 Share Posted March 23, 2021 1 hour ago, David Hunt said: Thank you triple Jim. I looked at the older post and found my problem. The backup 2 (10amp) fuse was blown. And thank you to all the people who commented to help Wow, I'm glad that's all it was. But I have to wonder why a blown fuse resulted in a high idle, and what caused the fuse to blow. You're welcome, of course, and I'll keep this in the back of my head for when it happens to me. Link to comment Share on other sites More sharing options...
David Hunt Posted March 24, 2021 Author Share Posted March 24, 2021 Yea the fuse was labeled as back up 2. 10amp Link to comment Share on other sites More sharing options...
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