Engine/Transmission (1998.5 - 2002) VP44 Special Function Test??

[TractorNut]

Do the Cummins dealers have the ability to do special function test on engines with the VP44 Pump... As special function test. . I mean. . cylinder cut out, Missfire and Compression test using a computer hooked via the CAN... On our John Deere tractors using the VP44 pumps we have this ability... I have never heard anyone mention anything about these test. . I guess its in who writes the software. .

Just curious...

Bryan

 

[A Johnson]

With Insite we can do cylinder diagnostics,i. e. single cylinder cutout and automated cutout. Some other tests include lift pump and grid heater override, can't think of any other special tests at the moment. My personal Snap-On tool will also do these tests via the DRB software.



I have never heard of being able to do compression testing via VP-44 diagnostics and I don't understand the algorithims the ecm would use to figure compression. Can you enlighten me?



A Johnson

 

[TractorNut]

Its not exactly a true compression test... its a relative compression test... the procedure is to crank the engine for 12 seconds. . the computer will keep the engine from starting. . It is really looking at engine RPM's and comparing each cylinders compression strokes to each other... Thus a cylinder is weak on compression it will show up as a lesser value. . (turning over faster on that stroke. ) on our computers displayed as a %... but if the engine is wore out. . but worn close to equal. . it will not show this because it is comparing the cylinders to each other. .

What we call the missfire test. . would be the same as what you are calling the automated cutout test. .



Thanks for the reply. . I had just never heard anyone talk about these tests. . I do have access to a Snap-On scanner. . (I think its a 2500. . or something like that... been a while. ) what other software do I need other than the 2001 software??? (I don't need it but ifI ever do... )

Thanks

Bryan

 

[A Johnson]

All makes sense now , its looking at crankshaft acceleration. I think Cummins is going to this on some engines to eliminate the camshaft position sensor. The idea is if the ecm knows which injector is comanded to fire and if it sees no acceleration on number one cylinder than it will assume it was at TDC #6 when it tried to fire and refigure everthing from that point, so it knows where #1 TDC is. (Kind of a rough explanation. )



I don't think you will need any additional software, just the Domestic cartridge should do it. As you model years get newer, the way It was sold to me was some of the diagnostics in DRB may stay the same, some will change etc, in other words your old cartridge may work to some extent on newer rigs. I don't think you will hurt anything by trying it. I haven't hooked up to an 03 yet to see. As a matter of fact I've only hooked it up to take a look, if you ever do it one of the things that is different is shorting out the cylinders follows the firing order. 1=1inj 2=5inj 3=6inj etc.



By the way, what engine models and displacements are running the VP on Deeres.



Are you nuts about old or new, or all tractors? I have a JD M wide front, I use to pull a trailer around and run a post hole digger. Doesn't do much work but the neighbors all get a kick out of it.



A Johnson

 

[TractorNut]

On the HPCR engines there are more thing that can be looked at, but basically the same tests...

We use the VP44 on 4. 5L 4 cylinders and 6. 8L... on tractors they have to have a certain transmission to recieve this pump. . and we already have a 4. 5L 4Valve and 6. 8L 4valve HPCR engines out. . so they will (should. . or until stock runs out) recieve the HPCR engine in place of the VP44 starting at the first of the year. . ... but I do not know how if they will stock pile them. . (actually they might be using the stock pile now) the Tier II emission have hit for these engines. .

Nuts about Deere's... but in spare time I Antique Tractor Pull... Pulling a G now. . and have a stroker G built. . just don't have the chassis finished. . should be ready to pull next spring... Trying to get a single turbo classes started...

I know what an M is like. . don't have one of those. . but between Dad and I we have about 15. . 2 cylinders...

Thanks for the info... .

Bryan



(I have always been curious if the pumps we are any different. . but most of them are on lower HP on the tractors. . (usually under 135hp. . but I have not look at some of the OEM applications the 6. 8L is easily in the 300+hp and will meet emmsions at that HP. . I sure wish GM would have stuck with that engine for their trucks. . there is a Chevy truck at the factory with a 6. 8L Deere engine in it. . and I have talked to people that drove them... Could have been... but Oh well... I'm driving a Cummins now... )

 

[rashwor]

Deere engines...

I have to agree. Deere engines will rival the Cummins as far as durability and ability. We have a Model M, a 1530 and a 6400. They are all working dudes... Love that 6400 with a loader and cab... a true working machine!Oo.