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Question, what exactly does engine % load mean?
Jimmy Garcia:
Good day,
I been doing some searching on the forum and google and am curious about the Aladdin reporting engine percent load. I have only seen it maxed out at 49 percent. No matter what my configuration towing or slick. I do not think I have power issues as it seems to move along. On flat ground it indicates prob 20 give or take. When I climb a grade the most I see is 49. Even with the transmission shifting. Does this mean that the engine is only giving 49 percent power. Does it mean that the engine has 51 percent to give? I have an 06 Monterey with C9 cat. Temps and systems seem to be holding within norms. Thanks for the expertise. Have a pleasant day. Cheers.
Eric Maclean Co-Admin:
Jimmy
The percent load is a calculated figure that the engines ECM generates using the ECM inputs like throttle position sensor , manifold pressure sensor RPM, etc , this is actually a percentage of the engines maximum torque output rating and in some cases is used by the transmission control system to modify the shift pattern.
In most cases the percent load should be near 95 to 98 % at wide open throttle while climbing .
My 3126 will run 98% climbing and anywhere from 30;to 60% on flat or semi flat ground dependant on throttle input.
If you don't notice any lack of power I would question the validity of the percent load figure however the Aladin only shows what engine ECM communicates to it meaning that figure if incorrect is a function of the engine ECM.
This is a question that might better be addressed by Dave Atherton
Hope this helps
Eric
Steve Huber:
Jimmy,
Climbing a grade with a 400 hp C9 you should be seeing over 49%. My guess is that the Alladin is the culprit based on your info as to engine performance.
Steve
Scott Shearer:
Jimmy,
The Percent Load on our Aladdin also pegs at 49%. At first, I thought that this might be a sign that the Aladdin system was failing, but I think it is actually a bug.
A couple years ago I started using the Silverleaf VMSpc system to report engine data and it appears to correctly report engine load, I see 100% load while the Aladdin system is pegged at 49%. In fact, the Aladdin reading is usually about ½ that of the VMSpc reading.
Don’t know for sure, but this bug may have been introduced in 2006 when Monaco started using J1939 protocol to report engine data. The Aladdin control module (VCM) only knows J1587 protocol and doesn’t understand J1939, so a protocol translator (J1939 Bridge) was incorporated into the system. On your coach, I believe that the J1939 Bridge is located in the front run box.
In 2007ish, Monaco started using the Medallion instrument cluster that reads native J1939.
-Scott
Jimmy Garcia:
Thanks everyone. You all are a great resource. I dont seem to suffer for power. On the flat the coach will get up over 65 if I am not paying attention. On hills well I can pass semis. I am guessing the bug theory may be likely. The engine runs good. Had full diagnostics and oil analysis everything checked good. I just found it strange. I think I will have to just double the value for now. Thanks so much.
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