jenkinsph
Super Star Member
Hey guys I Am getting a code 81 on my 4520. Can someone tell me what it is? Thank you.
CODE 81
- Thread starter jenkinsph
- Start date
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arlen4720
Veteran Member
- Joined
- Jul 6, 2012
- Messages
- 1,277
- Location
- Southeast Minnesota
- Tractor
- JD 4720, JD X748SE, JD 997, Farmall "B", Gator 865R, JD 320D Skid Steer
it is invalid or incomplete engine speed data on CAN bus. Do you have a service manual? There are a couple things to check. I can copy some pages for you tomorrow if you want. My service manual is for my 4720, but those parts should be pretty identical. What year is yours? Just wondering if it’s 2009 or newer to have the fully electronically governed engine.
Arlen thanks for responding. I found the issue to be a loose throttle sensor connection.
Now I am having problems with fuel shut off control. It will turn over at full speed but will not fire. If I push in on the key switch it will start immediately and shut off when I release the heater contacts. If I hold the key in with the glow plug relay removed from socket it will start too. As long as I hold the aux contracts in for heat the tractor will continue to run even after I remove all the relays.
I have ordered a new manual from Deere, but it will be at least two weeks before it arrives. I suspect it is a latching or holding circuit to keep the fuel flowing to the injectors but don't know for sure. This is a 2009 model with the higher 60 hp engine. All my connections are clean and in good shape. MINE IS THE ELECTRONIC CONTROLLED ENGINE.
Any one have any ideas? I really would like to finish a small job and plant some grass this weekend,
Now I am having problems with fuel shut off control. It will turn over at full speed but will not fire. If I push in on the key switch it will start immediately and shut off when I release the heater contacts. If I hold the key in with the glow plug relay removed from socket it will start too. As long as I hold the aux contracts in for heat the tractor will continue to run even after I remove all the relays.
I have ordered a new manual from Deere, but it will be at least two weeks before it arrives. I suspect it is a latching or holding circuit to keep the fuel flowing to the injectors but don't know for sure. This is a 2009 model with the higher 60 hp engine. All my connections are clean and in good shape. MINE IS THE ELECTRONIC CONTROLLED ENGINE.
Any one have any ideas? I really would like to finish a small job and plant some grass this weekend,
bullshipper9
New member
I've got the same problem. Did you ever find out what is wrong?
beenthere
Super Star Member
- Joined
- Aug 16, 2001
- Messages
- 18,510
- Location
- Southern Wisconsin, USA
- Tractor
- JD_4x2_Gator, JD_4300, JD_425, JD_455 AWS, added JD_455, JD_110, JD_X485(sold)
Welcome to TBN
You might try sending a personal message to jenkinsph to alert him to your question.
You might try sending a personal message to jenkinsph to alert him to your question.
oldtimer 66
Platinum Member
I have an older John Deere 4320/ 2006. In order to set my engine speed I had to log into the ECU thru the dash and adjust the engine speed/ rheostat according to voltage shown on the display/ dash. I think it was like .5 to .7 volts. You have a newer version of the tractor. My tractor is a Tier 2 engine. I don't know if this will help you.
