Cummins ISX has FSS Derate - TheDieselGarage.com
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post #1 of 44 (permalink) Old 09-01-2010, 08:13 AM Thread Starter
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Cummins ISX has FSS Derate

I have a 2001 ISX CM 570. It has a stall at full throttle in every gear above 6. I notice it mainly in top gear around 1350-1400 rpm thru 1650 rpm. I did an Insite log to see what was going on. The user fueling state shows both an AFC Derate and a FSS Derate. I think the AFC is due to boost pressure being low(the boost sensor looks like it may be sticking), but I have no idea what causes the FSS Derate. The FSS Derate is the one causing the stall in top gear and the one I'm trying to diagnose and correct.
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post #2 of 44 (permalink) Old 09-01-2010, 11:00 PM
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the AFC derate is not enough boost and can be acceptable for up to 10 seconds at full load.. other than that needs looking at.

i can't find any info on an FSS derate.
there is a fuel system derate caused by an active fuel system fault, or a fueling high speed governor state which means the engine is at max. RPM.

try calling Cummins at 1-800-diesels and asking about that user fueling state. apparently there are about 80 user fueling states in total.
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post #3 of 44 (permalink) Old 09-06-2010, 07:38 PM Thread Starter
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I called Cummins and they said they have never seen an FSS derate. Thet also couldn't tell me what the abbreviation was for. I have also talked to a few Cummins techs who don't know anytging about it either. I have very little confidence in Cummins techs anyway.
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post #4 of 44 (permalink) Old 09-07-2010, 05:05 AM
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Quote:
Originally Posted by junebug View Post
I called Cummins and they said they have never seen an FSS derate. Thet also couldn't tell me what the abbreviation was for. I have also talked to a few Cummins techs who don't know anytging about it either. I have very little confidence in Cummins techs anyway.
is not FSS is FFS is you need chance fuel filter? FUEL FILTER SERVICE i check my manual
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post #5 of 44 (permalink) Old 09-07-2010, 05:15 AM Thread Starter
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The fuel filters are new. Besides I can read and it is FSS not FFS. Its not a fault and there are no active or inactive codes being thrown. Its a user fueling state that happens during Maximum Fueling state.
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post #6 of 44 (permalink) Old 09-07-2010, 05:32 PM
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whats your engine serial number?
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post #7 of 44 (permalink) Old 09-07-2010, 07:06 PM Thread Starter
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ESN 14012552. 2001 ISX CM570
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post #8 of 44 (permalink) Old 09-07-2010, 10:41 PM
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did you call the local Cummins dealer, or the 1-800 number?

the 1-800 number is for cummins corporate.That's the same number a tech calls for troubleshooting help once the engine is out of warranty. they should be able to look up all of the user fueling states or call engineering to find out.
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post #9 of 44 (permalink) Old 09-07-2010, 11:24 PM Thread Starter
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I called Corporate first. They said they had never seen an FSS derated user fueling state. They also couldn't find any info on what the FSS abbreviation stands for. All of the distributors just want me to come in and see them for 102 an hour. They also say there needs to be an active code for a derate, but Insite says no codes either active or inactive.
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post #10 of 44 (permalink) Old 09-08-2010, 12:25 AM
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yeah I couldn't find any info on an FSS derate either.

And no, you don't need an active code for the derate. There are quite a few derates that do not set a code.

It might not hurt to get the ecm flashed to the latest version. At least you might wind up with a user fueling state that makes sense.

It looks like your ecm code should be N10184 that code is up to version 28 now. version 23 and 24 were supposed to fix a 'stumble' which might help you as well.

The ecm code can be found in insite in the features and parameters page in the first section.
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