General Boards > General Discussion
Question, what exactly does engine % load mean?
Jimmy Garcia:
--- Quote from: Scott Shearer on January 25, 2022, 07:13:08 PM ---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
--- End quote ---
Good day Scott.
So is that Bridge a plug and play fix to have accurate engine data? Thanks again.
Scott Shearer:
Jimmy,
I don’t think replacing the Bridge module would fix the problem...and replacement Bridge could be hard to find, I’ve seen them on eBay and some of the salvage yard sites and they are rather expensive.
If there actually is a bug it’s likely in the Aladdin control module (VCM). It also could be that our coaches have the wrong version of the VCM.
Of the engine parameters that I’ve compared, all others match between the Aladdin and VMSpc.
-Scott
Jimmy Garcia:
--- Quote from: Scott Shearer on January 26, 2022, 04:37:45 PM ---Jimmy,
I don’t think replacing the Bridge module would fix the problem...and replacement Bridge could be hard to find, I’ve seen them on eBay and some of the salvage yard sites and they are rather expensive.
If there actually is a bug it’s likely in the Aladdin control module (VCM). It also could be that our coaches have the wrong version of the VCM.
Of the engine parameters that I’ve compared, all others match between the Aladdin and VMSpc.
-Scott
--- End quote ---
Scott,
Thanks for that. Looks like there be no updates to the code and will have to live with simple math. Thanks again.
Dave Atherton:
Gentlemen, aftermarket equipment problems. I’m not a fan of using aftermarket add on equipment,
location connection point within Caterpillar ET diagnostic engine test port of which I have expressed
My thoughts several times. If everything is working fine there is no problem reading deeper in above
post possible aftermarket code reader is giving out incorrect data. Yes we have experienced before
engine ECM failure for this reason and again the data port was not meant to be used for attachments>
Reading on and the percent of engine power is programmed into the engine ECM as Eric stated come
from several factors. One thing certain information is not available for these aftermarket attachments.
Several of the beaver member have had Caterpillar ET readout engine ECM data and printout. Looking
at the printout you will note several entries in percentage of which will answer the first question, in
most cases percent of load depending on which engine we are talking about will fall into area 34 to 46
Percent. Same time fuel milage will run between 6 and 9 mpg, the engine throttle position sensor is
set between 3 to 5 percent of which all motorhomes will be 3 percent, the reason for setting of 3 percent is engine low idle at 700 rpms, high idle on throttle position sensor is 95 percent. This should
give you some idea correct values using OEM diagnostic equipment. Sometimes From a technician
stand point information that is incorrect can lead a person into a rabbit hole looking at what is correct.
The answer is the builder of the engine has the correct technical information. Dave Atherton Retired Cat
Mechanic
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