mf 6490 error code 94 help

HB1 · Jan 12, 2019

Thanks Glaws, you seem to be pretty confident in the relief valve, so the code pops up when it senses a low pressure, or high pressure, or does it pop up whenever it is out off range? What about connections or wiring like what Mursal was saying? I have never replaced it myself, and it looks like I will need to remove some wiring harness and some fuel lines. It will be next week when I get to it. Ill be excited if that turns out to be the problem. Ill take some choke and carb cleaner on the old one. Here is the picture of the old one.

Glaws · Jan 12, 2019

HB1 said:
Thanks Glaws, you seem to be pretty confident in the relief valve, so the code pops up when it senses a low pressure, or high pressure, or does it pop up whenever it is out off range? What about connections or wiring like what Mursal was saying? I have never replaced it myself, and it looks like I will need to remove some wiring harness and some fuel lines. It will be next week when I get to it. Ill be excited if that turns out to be the problem. Ill take some choke and carb cleaner on the old one. Here is the picture of the old one.
View attachment 756016

Yep that’s the one. If that valve leaks then the rail won’t maintain pressure and you’ll get the code.

The oil in the harness is due to oil over time, routing down out the rocker cover along the injector harnesses and eventually making it to the ECU connectors. This can cause some odd issues but the relief valve issue is more certain.

HB1 · Jan 16, 2019

I replaced the valve with cleaned one, error code still appears about 15min in.

Does the code appear right away for you guys or when the tractor warms up? I live in Manitoba Canada, they change to winter fuel in september or so till march april.

Always wandering · Jan 16, 2019

There are different flow rates for these pumps make sure 100% you have the correct pump

Also check fuel lines for restrictions going back to tank often it can be the most simple thing like a bit of straw etc stuck in fuel feed pipe to lift pump
Also check banjo fittings on fuel lines as this is the first place to choke

Deerefarmer · Jan 16, 2019

HB1 said:
I replaced the valve with cleaned one, error code still appears about 15min in.

Does the code appear right away for you guys or when the tractor warms up? I live in Manitoba Canada, they change to winter fuel in september or so till march april.

I just recently fixed one doing the same thing, was mainly getting e 9150 but also e94, replaced electric lift pump, didn't help, blew out fuel line back to tank still got codes, so I pulled the rail relief plug, and lo sure enough it had debris. I put one in that I had cleaned and still got code, finally went to dealer and picked up a new one, presto, problem solved. Lesson to me was probably better off buying new than trying to clean.
I've also seen e9150 be caused by excessive injector return flow.
How many hours does your tractor have?
If a new rail relief doesn't fix it you may want to have the returns measured.
But I would start at the tank and work up, if you know what I mean, ie process of elimination

HB1 · Jan 17, 2019

What you are writing makes sense, we have done our homework and its starting to point to some injector problems. I think I will do a leak test.
Thanks for the posts. I was hoping it would be something easy like seeing that piece of wire in the valve like leonb was showing us

HB1 · Jan 18, 2019

Is there Bosch injectors or others on the market that will be cheaper than Massey's?

Deerefarmer · Jan 18, 2019

Ask your dealer about remans

HB1 · Jan 28, 2019

Hi everyone, some encouraging update. Just finished leak test on Saturday

HB1 · Jan 28, 2019

Here is the results. .

HB1 · Jan 28, 2019

I right away thought it was just one injector i had to replace. Put everything together. I was happy it was just one! Then I showed this to a friend from church who is a mechanic for john deere. Said its possible that the leak is happening where high pressure fuel line is entering injector. So l tried tightening the nut (I'll attach a picture) It was a tight fit in there but I managed to tighten it a small amount (Hard to tell if I tightened it or if wrench was slipping of the nut, I had no space to move our get good grasp on nut). But I wasn't convinced this nut was the right one. But next day I did not have the error code! Ill keep an eye on it to see how long this will last. Hard to imagine this was it.

davidroberts30 · Jan 28, 2019

HB1 said:
I right away thought it was just one injector i had to replace. Put everything together. I was happy it was just one! Then I showed this to a friend from church who is a mechanic for john deere. Said its possible that the leak is happening where high pressure fuel line is entering injector. So l tried tightening the nut (I'll attach a picture) It was a tight fit in there but I managed to tighten it a small amount (Hard to tell if I tightened it or if wrench was slipping of the nut, I had no space to move our get good grasp on nut). But I wasn't convinced this nut was the right one. But next day I did not have the error code! Ill keep an eye on it to see how long this will last. Hard to imagine this was it.

Thanks for the update

Leonb · Jun 17, 2019

@dee @Glaws lads have ye ever came across error code t1 25 transmission fault won’t change ranges and sometimes won’t move at all checked all the connections on the side of the box seem ok but there’s two block connectors on top of the box one had a small bit of Corrosion and the other had oil creeping up the loom cleaned both but didn’t fix the problem.

HB1 · Jun 17, 2019

Hi, I had that error code while silaging. The tractor wouldn't move. One tractor dealer said there was nothing I could do but bring it in to have lap top hooked up. So I tried another dealer. They told me to look at fuses F4, F18, F29. I forget which one I replaced, but that fixed it.

Leonb · Jun 17, 2019

HB1 said:
Hi, I had that error code while silaging. The tractor wouldn't move. One tractor dealer said there was nothing I could do but bring it in to have lap top hooked up. So I tried another dealer. They told me to look at fuses F4, F18, F29. I forget which one I replaced, but that fixed it.

Hi thanks looked at them 3 fuses all seem ok. Did yours come and go or just stop altogether?

HB1 · Jun 17, 2019

I had it happen once that year, I forget if it happened again a year later, because it wasn't a big deal then since I just checked one of the fuses and that fixed it. So it pretty much seemed like a once or twice a lifetime thing here. When it did happen, there was no warning. The tractor was running no problem but when switching to go forward or backward, all we heard was a strong noise just once but no movement. We would turn the tractor off and back on and same thing, just a single noise and switching forward and backward would not do anything anymore.

Leonb · Jun 17, 2019

It comes and goes with me but it’s starting to get more frequent now it happens at least once every time I drive it turn it off for a couple of minutes then works away again.

Always wandering · Jun 17, 2019

Get tractor really hot trans temp 60+ degrees and if it does it check the resistance on all 4 range solenoids the odd one out will be your problem

You will probably find it’s ok when cold but when it gets Upto working temp it will do this

Leonb · Jun 18, 2019

Thanks @Always wandering ill check that today. Do they give a lot of trouble?

Leonb · Jun 18, 2019

Are these the four range solenoids?

mf 6490 error code 94 help

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