VMSpc Engine Monitoring for PC.

J1939 Data Link Abnormal Update

I get an error code each time I start the engine. The code is "J1939 Data Link Abnormal Update". The engine is a 2001 Cat 3126B in a 2001.5 Fleetwood Discovery. The code seems generic and I'd like to find a more definitive description of the problem.


VMSpc on $179 Nextbook

I recently ran across a 10" screen Nextbook Windows 8.1 computer at Walmart for $179. This tablet comes with a removable keyboard so that it can be used as a touch screen tablet or notebook.

I've installed VMSpc V2.5 on the Nextbook and now have a dedicated VMSpc computer with sufficient screen real estate to display all the gauges I want at a size I can easily see.

I did have to install the drivers manually to get the computer to recognize the USB JIB. I've purchased a blue tooth mouse to make changes to the program easier and purchased a USB A female to USB B male adapter so I can use a standard cell phone cord to plug into the micro usb port on the Nextbook.

Changing text size

In setting up my VMSpc screen when I added a new gauge like New Clock the text is very large. When I right click on the gauge I only get and option to change color. What am I missing here.

I can resize gauge, but text remains same size.

Tablet Woes

Have specific issues with Specific models of a Tablet (or convertable)?

Post them here so all can benefit.




Maintenance Schedules, LOF and Tanks--Oh My!

Hey folks...Art here...

Its well into that time of year for cleaning out the paddock to make room for the Tiffen...Newmar or Country Coach for the winter ahead--as many of you are relating over the phone. You're cleaning tanks and pulling the blinds. The organized types (which is about ALL of you!) are relating seasonal lists.

Bob "bobrw9" gave a super explanation of how he's using the Maintenance scheduler within VMSpc to manage just that.

Here's the twist: He's doing that on his tower computer at the house. He saw the practical VMSpc application as something that can be installed anywhere; doesn't need the jib connected for this at all.

What he didn't mention was calender file: maintenance.vms it creates.

When you make a schedule for LOFs, tires, tanks, prop-wash and awning lube--whatever; it creates and saves a maintenance.vms in the c:\vmspc directory. Good to know if you already have one started in the coach on the laptop or tablet.

Once that's created, its portable. Copy maintenance.vms (to a flash drive or send it to yourself via an email...however) and save it in the same vmspc folder--in the tower or PC at the house. Non-rolling type, that is. It will be the schedule then, next time you launch VMSpc from there.

Then, when you open that land-locked version, away from the coach, you can have the schedule closer to the shop and coffeepot.

Here's where you can download a fresh copy of the VMSpc
software distribution disc.

Here's a big hello and thanks(!) to Bob for his keen observation.


Silverleaf Electronics
Documentation Central

Tablet PC bargain!

Here's a real bargain!

A fella calling into the VMSpc helpline gave us this tip:

An Insignia™ NS-15MS08 tablet -- 8" (Small but doable) for $99

Its a trimmed-down unit--in that it has limited memory and the caller (who was busily using his own) said it can be a bit laggy with some apps.

This is a great example of a limited or single-use device; perfect for USB-VMSpc on-a-budget. That being said, an 8" screen is small. It will be a bit slower to set up (as resizing and placing gauges will require more patience.) Once set up, it will work well and look pretty nice, port-side, under the side-mirror.

I looked through the reviews and it seems the only nay-sayer got his feelings hurt after he loaded the Microsoft Office 365 Suite and it couldn't run anything additionally. Why put that on such a small tablet? Dunno. The rest love it.

As a bonus, the caller also mentioned its HDMI port--for running video up to his overhead monitor. Zounds! Its HERE: at on the BestBuy.com site.

This same caller mentioned purchasing a $6 'splitter' for USB power.

Combine that with a USB A-to-B adapter and you've got a complete setup.

So...there ya go. Remember: your mileage may vary...


Documentation Central
Silverleaf Electronics

(And will that caller please take a bow?)

Windows 8.1 and ad hoc wifi

Does anyone have an update regarding Windows 8.1 not being able to see the JS550 ad hoc wifi signal? Has anyone identified a good work around?

PID code 233,12...what's that anyway?

A recent caller to the VMSpc hotline was chasing down a PID 233,12 error. That, coupled in a persistent embrace with PID 94,2 Pardon the simile. No other odd (*ahem* Cummins oddity codes); just those two.

After some discussion we felt he had a direction to look into--as it did seem like a hardware failure...but of what, exactly?

Can't sleep? Here's a document which, oddly enough, starts clearing it up:


In the patent description, it discusses the role of the CPC2 as a gatekeeper of emissions. It tells-all to the MCM (as it relates to PID 94 and others) as being a reporter to this monitor-and-controller-of emissions. Its a good read.

I say 'starts' to clear it up as he'd already replaced fuel filter. What else might he look at guys?

Bob-from-rainy-Ohio --Thanks for the heads up on this one!

Art Renda
Documentation Central,
Silverleaf Electronics
(888) 741-0259

Total miles on coach incorrect

The odometer on the coach shows 42005 miles and the VMSpc shows 26115 miles. Is there a way to correct the VMSpc reading to the 42005 miles reading??

WIndows 8.1 Tablet touch screen

Is there a way to lock the VSMpc screen gauges. I have touch screen and every time I touch the screen a gauge moves.


Jake Brake indicator

Is there a "Jake Brake indicator" that can be installed on VMSpc? I have a Detroit 60 with MH4000 trans.

Metric conversion


Being in Australia I have tried to convert my gauges to metric. I think I have achieved most of them (not tested as vehicle off road at present) but need some help with the odometers.

How could I change the units to the metric equivalents on the Odometers and will the values be shown as metric if I have put in the Engine corrections for odometer and fuel meter?

Also I have two Plus under my dash one that shows just engine info and the other just gearbox info (Eaton Autoshift) how can I combine these to show both on the VMSPC?

I think this is a fantastic product and would like to see more layouts, maybe a section for layouts to be shown on here would be an idea


software upgrade

Is there anything the works for a gauge shape upgrade? The glass dash systems have round gauges and other visually attractive attributes. How about just the option of a round gauge. vmspc so far has performed flawlessly. Made me a better driver and improved mileage. 2002 400hp western rv alpine

fuel pressure monitor ?

With a big diesel engine, think big RVs and trucks, when the fuel lift pump fails and the engine is running, nothing will happen. The engine will continue to run.
The lift pump is used to pressurize the fuel system for starting the engine.
When the lift pump has failed and the engine is shut down it will not restart until a new lift pump is installed.
Lots of tow jobs, lots of roadside repairs and lots of money changing hands.

We need way to monitor the lift pump output pressure real time.
Seems as though you folks could step up to the plate on this problem and make some money.

CAT C7 350 Odometers do not work

We have a 2004 Itasca Meridian with a CAT C7 305HP engine and the Bluetooth version of VMSpc. For some reason VMSpc is unable to read either the total fuel or total engine hours. The local truck service center was able to read both with their software so the data is available. The value of VMSpc is significantly reduced without functioning odometers.

Anyone else have a similar problem? How about a solution?

SID 48 & 49

I have a 1999 Cummins 275 ISB in my 2000 Fleetwood Discovery MH. My VMSpc Diagnostics shows multiple codes and I know many of them are inconsequential. But there are a couple I'm concerned about:

ENG SID 48 1 Injector Cylinder #18 Low Reading 7/11/14 10:54

ENG SID 48 1 Injector Cylinder #18 High Reading 7/11/14 10:54

I have had both of these readings multiple times and the same reason for #19 but with SID 49.

Nothing has shown up in the Recent Diagnostic Events window - these all show up in the History Notepad file.

Can you tell me what these mean? Is there a place I can find a list of the codes?

Thanks very much for your help.

Pat Curry

Fluctuating data

I have used the VMSpc on my bus conversion since 2006, right after I had the bus repowered to a Cummins 450HP ISM. I currently run the VMSpc with Version 3.0, Build 1.

During recent trips, I have found some of the data displayed fluctuate consistently, up and down, usually by more than 10%.

Some of the gauges are stable, those being oil pressure, coolant and oil temps, miles, all the mileage (odometers), mpg, gph, cruise and speed.

The ones that vary constantly as said above are:
tach (rpm), turbo (boost), Power (HP), Torgue and Load (%). .

I am using a ASUS netbook computer with Windows 7.

Any help. What am I dealing with. I ruled out connection problems due to the stability of some data, but fluctuations of others. Could it be my Engine ECM? If so, what can be done about it?


Fuel Consumption reading does not record

Over the past few trips I have noticed that the Fuel reading in the Odometer gauge as well as the Tank Minder for my VMSpc software is not changing, even after traveling over 100 miles at times. It will occasionally update at random distances traveled but the most recent occurrences have been over 100 miles. The analog fuel gauge in the dash seems to be working fine. All other gauges in the VMSpc software are working fine. Any ideas or corrective measures would be appreciated.


Where to buy

Can I buy a VMSpc kit directly from Silverleaf? If not , where?

Thanks, Kevin

VMSPC Classic?

Saw a reference to a classic version of VMSpc for older coaches (1998 with a Cat diesel). Is this still available? Do I lose any functionality over a standard version?

Thanks, Kevin

Windows 8.1

Any help running VMSpc on a HP windows 8.1 computer?
Installed VMSpc 3.0 on my windows 8.1 computer.

VPSpc Serial Unit w/USB Adapter

I found that I have a VMSpc model JR500 J1708 Interface Board, v.2.01 software v1.10 in my motorhome. I would like to use this with my HP dv6-1245dx laptop, running Windows 8.1 Pro 64 bit, which has no serial ports. Will this VMSpc unit work with my laptop with the proper Serial-to-USB adapter? If so, then is there a recommended adapter that works well with Windows 8.1 Pro, 64 bit?

I am anxious to use VMSpc, and would like to us this unit, if it will work well, instead of purchasing an entirely new cable assembly.


Fluctuating Voltage

I have a 1996 Safari Sahara with a Cat 3126 (no letter) 250 HP engine.

The voltage is always in conatant change on my VMSPC. It fluctuates from 14 - 13.4 - 13.6 - 13.8 over and over again. The voltage changes quickly and is never rock solid.

You once addressed this issue but the reply was that we must indeed have fluctuating voltage. On a Safari forum we have a number of VMSPC users that all report the same fluctuation.

Using a Fluke DMM and also using an oscolloscope I find that there is no voltage fluctuation as displayed by the VMSPC. I have replced the alternator and also the isolator and still have the problem. All wiring connections are clean and tight.

One thought is that there might be a setting to slow down the sampling rate of the voltage read. Am I on the right track?

John Ruff
96 Safari

Windows 7 VMSpc driver

VMSpc adapter "driver for this device are not installed".
Tried original software, tried downloading from website. No joy.

What do I need to do to get drivers installed. Tried to update driver from device manager, no joy.

Windows 8 insall

I just tried to install VMSpc on HP windows 8 machine. Program installed and window with gauges came up displaying current mileage data. I closed the program. When I reopen the gauges do not show. If I go to file and open I get a popup that reads "Error reading file" Any suggestions.



Combining Engine and Trans connectors


I have seperate connectors for my engine C12 Cat and Transmission Eaton Autoshift.

I was wondering if it would be possible to make up a cable that could combine these so I can monitor both at the same time? And would this cause any issues?

I figure some sort of Y cable that connects to both and then allows me to plug my JIB in.


Cat C12 410HP engine File


I was wondering if you have been able to produce an engine file for a Cat C12 410HP?
I sent the Data sheet to Marko a few months ago?


ENG SID 237 11 Start Enable Device Unknown Failure

what does this diagnostics mean on my 1999 Itasca with 275hp cummins? ENG SID 237 11 Start Enable Device Unknown Failure 3/18/14 16:43

I get this often when first starting the motorhome. 3

Going from 2002 to 2014

Trading up from 2002 Allegro Bus to 2014 Tiffin Phaeton. Is there anything special / different to be addressed to connect my VMSpc to the diagnostic port? Diagnostic connector the same? Easy to find connector?
Do not have the RV yet, just looking ahead.

Tire Pressure Monitor

I know that you have an option for using pressure pro tire sensors. Was wondering if there are any plans to use other system sensors where batteries can be replaced such as systems from TireTracker?

Syndicate content