We had the Check Engine light come on after about 2 hours of driving down the freeway. All fluids and temps were normal.
Stopped and while engine was running checked Silver Leaf Diagnostics. It displayed "Eng PID 84 10 Road Speed Abnormal Change 4/7/11 11:29" Can anyone translate that to a Cummin's code?
The Check Engine light did not go out when I restarted the engine. In fact, it comes on again as soon as I turn the switch on and was again recorded on the Silver Leaf. No other codes were displayed.
I checked with Foretravel and Cummin's by phone and both thought we could finish our trip, but to keep a sharp eye on temps and pressures. We did with no apparent problems.
Any suggestions?
Is there a data base of Silver Leaf codes that have been seen and how they were resolved?
Thanks, Dick
Can you use the Cummins "Blink Codes" to find it?
http://www.beamalarm.com/Documents/cummins_ism_engine_codes-after_2002.html (http://www.beamalarm.com/Documents/cummins_ism_engine_codes-after_2002.html)
;D I am going to try that today. Since it is persistent, I'm thinking it is an "active" code.
Barry do you know if there is a repository for Silver Leaf codes and solutions?
Dick,
I put the info into Google, read through a couple of pages, found
PID 84 = road speed
10 = abnormal rate of change
With suggestion to check the speedometer circuit and some comments that cruise control and vehicle speed governor may not work properly.
The PID (process ID), etc., are not unique to Silverleaf; they are apparently the standard nomenclature for engine/transmission data retrieval. I just mention this so you don't include "Silverleaf" in any searching. Just put
PID 84 10 "Road Speed" Cummins and you should see the various site hits I found.
With the blink codes Barry mentions you can search for Cummins fault codes. I'll bet it throws either a 241 or 242
Could be just a loose wire (crossing fingers for you).
Michelle
My luck with blink codes is not very good. We saw 1 red a pause then 4 red blinks, then nothing. It did not repeat . Retrying showed us nothing. Pressing the cruise control Set/Decel or Resume/Accel did nothing.
Cummins 14n codes weren't close, but 24n got me to 241 & 242 as you suggested Michelle. Googling 241 took me to something that tied it to the Allison. When I checked the transmission for fault codes, the Check Engine light went off and has not come back on after a few ignition cycles and starting the engine. I wonder why???
I'll look for loose wires. And see if it happens again.
The last time we had Check Engine light it went away by cycling the ignition and has not happened again.
I have cpied and pasted your problem to Martin at Silver Leaf just now so hopefully he will gewt back to me with an answer soon. Martin is owner and designed the program and he has helped me with my little problems
john
Dick,
Here's the best document I could find for SAE code cross reference. P. 64 starts the Cummins ones (it also includes Allison and Cat as well as Wabco ABS ones)
www.jinbenteng.com/engling/USA%20Commerce%20Vehicle%20Fault%20Code.pdf (http://www.jinbenteng.com/engling/USA%20Commerce%20Vehicle%20Fault%20Code.pdf)
Michelle
Ok, Thanks John.
Michelle, that is some document. It also shows PID 84 = Road Speed and more interesting (to me) 10 = is a Failure Mode Identifier (FMI Code) that indicates the method of failure, in this case Abnormal Rate of Change.
Ya think I went 0 to 60 in less than 10 sec.? :))
If you did, tell Dave M. how so he can cancel his order for the "How to Hot Rod your Small Block Cummins" parts :))
If I had to hazard a guess, I'd think momentary loss of data transmission. Loose connection. Sender unit hiccup. Interesting that the activities related to trying to read the code cleared it.
Keep us posted if it happens again or if you discuss it further with Cummins.
Michelle
The idea of hot rodding my M 11 is pretty interesting too...... ;D
;D Yup, If I had the ISX engine, it would have to go to the 750 hp rating, :))
Just hope I am not opening a bag of worms.
Small note: The ISM is the smallest engine Cummins calls Heavy Duty.
Can someone tell me if the attached photo is the speed sensor on the transmission? The picture is taken looking up between the batteries and the transmission. This device is on the driver's side of the transmission and the wires are running toward the front of the MH.
I took this connection apart and then put it back hoping that might help ensure a good connection and might prevent further occurrences of this code.
Based on my experience, I have a suggestion about a (not necessarily good) way to see if it is the speed sensor. Disconnect it and see if the transmission will shift beyond second gear.
We were driving in snowy, icy conditions when our SOB with Cummins B5.9 and Allison 6 speed went into "limp" mode. It would operate in reverse, first, or second gear. It would not shift above second gear. The Allison code showed loss of speed information. We managed to park in a safe place and wait for conditions to improve. I found that the weight of an accumulation of ice had extracted from the transmission a plug similar to the one in your picture. When I reattached the plug, all was good again.
The test is pure shade tree mechanic stuff, but might give you an answer. Of course, you may have already fixed the problem by reseating the plug.
Dick S,
Here is an answer from Martin of Silver-leaf. quote
"From the Cummins book:
84-10 "Wheel-Based Vehicle Speed Sensor Circuit tampering has been
detected - Abnormal rate of change. Signal indicates an intermittent
connection or VSS tampering."
Sounds like a possible loose or corroded connection. end of Quote
Looks like what has been suggested by the brains around this Forum. Boy am I glad I (after 5 yrs)!!! logged onto this board, as it has a fabuluos knowledge base on Foretravels and is worth its weight in Gold. I spend hours a day going thru all the info (over the years) I have missed learning and pictures of problems/fixes. The best part is I will not feel stupid asked for help !
Thanks all.
Hope that helps
Thanks John,
Marten sounds like a great resource at Silverleaf.
Speaking of hot rodding the ISM, well Cummins does not see it that way, it is with their blessing and now find it can go more than the 500 hp, but I am not interested at this point as all is setup for Monday AM the 18th. Once that is done and working as hoped, maybe a higher setting could be considered. The big hope is that in fact the fuel burn should improve at low rpm as the boost will be higher. At higher rpm is when the bypass starts to kick in and then the fuel rate goes up.
Maybe a pipe dream, nothing ventured, nothing gained I have heard.