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Old 12-05-2021, 06:12 PM   #1
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2000 ISB power loss

My coach has a 275 hp ISB. While driving it will lose boost for up to 10 seconds then it kicks back in. It will set the check engine light with the 102 4 fm code. The code is a low voltage short to ground. I replaced the map and Iat sensors with no luck. Any advice on which wires I need to test would be appreciated. If it is a wire issue. Could it be something else?
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Old 12-05-2021, 07:52 PM   #2
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Quote:
Originally Posted by george y View Post
My coach has a 275 hp ISB. While driving it will lose boost for up to 10 seconds then it kicks back in. It will set the check engine light with the 102 4 fm code. The code is a low voltage short to ground. I replaced the map and Iat sensors with no luck. Any advice on which wires I need to test would be appreciated. If it is a wire issue. Could it be something else?
I would replace the crank position sensor too, if it doesn’t fix you’ll have a spare. I had an intermittent cps that did the same thing but I don’t think it was the same code as yours.
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Old 12-07-2021, 07:56 AM   #3
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See this webpage for your troubleshooting your fault code: https://www.blog-teknisi.com/2018/07...-code-123.html
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*SMC, Beaver, Monaco History, Problems https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
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Old 12-07-2021, 08:30 AM   #4
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Thank you CountryB. This is what I was hoping for. A place to start my search for this issue. Thanks.
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