JD6620 Fault codes

Andrew · Aug 19, 2019

Got 2 fault codes on a 6620, one of which doesn’t appear in the book.

ECU 94 10 Low fuel pressure
ECU 1 347 07 which doesn’t appear in the manual.

The fuel light top left of the dash comes on, and have to go into the screen to get the codes.

It’s had new fuel filters etc.

Waiting on a call back from the dealer so lets see if TFF can beat them.

Yazzie · Aug 19, 2019

Our 6620 has fuel lift pump above fuel filter which has a filter screen inside it.
Bit of pain because you have to take pump to bits with torx screws. This brings low fuel pressure up on our tractor.Has yours got vp 44 pump like ours?

Andrew · Aug 19, 2019

Yazzie said:
Our 6620 has fuel lift pump above fuel filter which has a filter screen inside it.
Bit of pain because you have to take pump to bits with torx screws. This brings low fuel pressure up on our tractor.Has yours got vp 44 pump like ours?

It’s a Denso. JD part number on it is RE507959.

Hesston4860s · Aug 19, 2019

Isn’t that second code a fuel pressure mismatch between what the tractor wants and what the high pressure pump is delivering.

So could be pump or injectors !.

Tractortech · Aug 19, 2019

Andrew said:
Got 2 fault codes on a 6620, one of which doesn’t appear in the book.

ECU 94 10 Low fuel pressure
ECU 1 347 07 which doesn’t appear in the manual.

The fuel light top left of the dash comes on, and have to go into the screen to get the codes.

It’s had new fuel filters etc.

Waiting on a call back from the dealer so lets see if TFF can beat them.

Now Then..
ECU 001347.07 is fuel rail mismatch. The actual pressure in the rail is +/- about 50 bar.
Causes, connections, fuel system, check it all, right from the tank suction screen. Faulty SCV or rail relief valve. Many, including some dealers will tell you it's the injectors. However, I've never needed to replace injectors to cure 1347.07.
It looks like you've had a new SCV already

Andrew · Aug 19, 2019

Tractortech said:
Now Then..
ECU 001347.07 is fuel rail mismatch. The actual pressure in the rail is +/- about 50 bar.
Causes, connections, fuel system, check it all, right from the tank suction screen. Faulty SCV or rail relief valve. Many, including some dealers will tell you it's the injectors. However, I've never needed to replace injectors to cure 1347.07.
It looks like you've had a new SCV already

Cheers. You’ve beaten the dealer anyway. Light only comes on when pulling, normally up hill with a trailer when the revs start to drop.

Will have another look at everything.

Tractortech · Aug 19, 2019

Andrew said:
Cheers. You’ve beaten the dealer anyway. Light only comes on when pulling, normally up hill with a trailer when the revs start to drop.

Will have another look at everything.

Take the suction filter out of the fuel tank and make sure its clean, check or replace fuel hoses correctly, making sure the 1mm restrict or is in place and change the filters. After that, you need a dynamometer and Service Advisor, etc..
How many hours has it done??

vario · Aug 19, 2019

Andrew said:
Cheers. You’ve beaten the dealer anyway. Light only comes on when pulling, normally up hill with a trailer when the revs start to drop.

Will have another look at everything.

sounds just like injectors trouble

JD6620 Fault codes

Andrew

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Yazzie

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Andrew

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Tractortech

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Andrew

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Tractortech

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vario

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