NX4510 HST RPM's Dropping CEL light

[Highgear]

So what good would it do to have a list of codes and not have the dealer ($$$$ ) code reader ? Not like you can drive the tractor down to the local Auto parts store and have them read .

 

[JimR]

So what good would it do to have a list of codes and not have the dealer ($$$$ ) code reader ? Not like you can drive the tractor down to the local Auto parts store and have them read .

So true about the codes, but at least you can figure out what is wrong using the manual. I should have done a meter check on this control. It would have saved me a lot of time and aggravation.

 

[Threepoint]

So what good would it do to have a list of codes and not have the dealer ($$$$ ) code reader ? Not like you can drive the tractor down to the local Auto parts store and have them read .

Well yes, there is that. :laughing: But in addition to the fault codes, names and descriptions, the tables also list the actions that the conditions produce. E.g., "CEL FLASH," "CEL ON," "CCRT REGEN. DISABLE OR STOP," "INCREASED IDLE," "LIMP HOME MODE." So even if you can't read the actual code, you can cross-reference back from the ACTION columns an at least narrow the likely conditions.

I don't yet have a shop manual for my CK, but I do for my NX. All 1074 pages of it. Not for light reading, but it seems to be fairly clearly written, the diagrams and pictures are very good, and there are good descriptions of how the various systems and functions work. The error code tables are only a small part of the manual.

 

[JimR]

Well yes, there is that. :laughing: But in addition to the fault codes, names and descriptions, the tables also list the actions that the conditions produce. E.g., "CEL FLASH," "CEL ON," "CCRT REGEN. DISABLE OR STOP," "INCREASED IDLE," "LIMP HOME MODE." So even if you can't read the actual code, you can cross-reference back from the ACTION columns an at least narrow the likely conditions.

I don't yet have a shop manual for my CK, but I do for my NX. All 1074 pages of it. Not for light reading, but it seems to be fairly clearly written, the diagrams and pictures are very good, and there are good descriptions of how the various systems and functions work. The error code tables are only a small part of the manual.

Threepoint, Thanks for posting that info. I now wish I bought a manual when I first bought my tractor. That is on my "to do" list now.

 

[Threepoint]

So true about the codes, but at least you can figure out what is wrong using the manual. I should have done a meter check on this control. It would have saved me a lot of time and aggravation.

Agree.

Jim, coincidentally, when you posted awhile back in another thread about the joystick cable issue on your NX, I was able to go to the manual and pull up the photos of the relevant linkage to better understand what was happening. :thumbsup: I may never have that condition, but if I ever do, I'll recognize it and know that it's likely a DIY fix without a 200 round trip to my favorite dealer.

 

[JimR]

Agree.

Jim, coincidentally, when you posted awhile back in another thread about the joystick cable issue on your NX, I was able to go to the manual and pull up the photos of the relevant linkage to better understand what was happening. :thumbsup: I may never have that condition, but if I ever do, I'll recognize it and know that it's likely a DIY fix without a 200 round trip to my favorite dealer.

Many items are DIY for the mechanically inclined. I hate bringing anything to a dealer as I use to work for 3 different ones. I saw what went on there. I have pushed wrenches my entire life on anything that moves and runs. My only wish is that they could have kept the electronics out of the tractors. That has made it harder for the DIY guy to be able to fix it. Not being able to read codes doesn't help. A 200 mile drive is not a good thing for sure.

 

[JimR]

Chapter 12 of the Work Shop Manual has a table listing fault codes and symptoms (actions the tractor will employ when fault codes are triggered). Only 9 fault codes will trigger a "limp home" response. Most of these responses have to do with with either the foot pedal sensor (throttle position sensor) or the hand throttle lever sensor. From your description of the problem the most likely scenario was an issue involving the hand throttle lever sensor.

I picked up the tractor today and it is running like new once again. The problem was in fact the hand lever controller. The easy way to figure out a bad one is to turn on the "Linked Pedal" to see if your throttle works like it should when you step on the foot pedal. Funny thing is that I have never used this option on my tractor. I did try it out today and that does work fine also. If the pedal works fine, then most likely the hand throttle controller is faulty. The two switches use the same plug connector. If you think you have a bad controller you can swap it out with the other one and try the throttle. Here are my fault codes if someone would like to put up the error messages that go with them for all to see. P2138-00, P0002-23, P1620-03, P1624-00, P0379-31, P061b-00, P16d2-00, P1606-00, P1219-00, P0341-31. I put an hour on it today and all went well. A little info on regen mode from the dealer. They told me to keep the rpm's up and it would be a rare occasion that the regen cycle ever comes on. My tractor has only goner into regen once by itself. The other times I ran it just to see if that would fix my problem. I was told that they ran a test on my canister and that it only had 2% carbon reading in it. At 100% the tractor will go into regen cycle. I guess my tractor is running pretty darn clean.

 

[woolyAcres]

I picked up the tractor today and it is running like new once again.

Great news! Glad you're back in business. Thanks for sharing the codes, symptoms, tests, and fix. The next user with this issue will hopefully be spared the hassle you've had.

 

[JimR]

Great news! Glad you're back in business. Thanks for sharing the codes, symptoms, tests, and fix. The next user with this issue will hopefully be spared the hassle you've had.

I sure hope the next person who has this problem does some research here to find the solution. I wish I had known about the "linked pedal" to check out the RPM's issue.
It would have saved me many many hours of checking everything in my search to find the problem.

 

[AWSubie]

I picked up the tractor today and it is running like new once again. The problem was in fact the hand lever controller. The easy way to figure out a bad one is to turn on the "Linked Pedal" to see if your throttle works like it should when you step on the foot pedal. Funny thing is that I have never used this option on my tractor. I did try it out today and that does work fine also. If the pedal works fine, then most likely the hand throttle controller is faulty. The two switches use the same plug connector. If you think you have a bad controller you can swap it out with the other one and try the throttle. Here are my fault codes if someone would like to put up the error messages that go with them for all to see. P2138-00, P0002-23, P1620-03, P1624-00, P0379-31, P061b-00, P16d2-00, P1606-00, P1219-00, P0341-31. I put an hour on it today and all went well. A little info on regen mode from the dealer. They told me to keep the rpm's up and it would be a rare occasion that the regen cycle ever comes on. My tractor has only goner into regen once by itself. The other times I ran it just to see if that would fix my problem. I was told that they ran a test on my canister and that it only had 2% carbon reading in it. At 100% the tractor will go into regen cycle. I guess my tractor is running pretty darn clean.

P0002-23 - Rail pressure control fault due to high or low Inlet Metering Valve current trim.
P061b-00 – Not listed
P0341-31 – Cam signal lost
P0379-31 – Not listed
P1219-00 – Not listed
P16d2-00 – Not listed
P1606-00 – Not listed
P1620-03 – Not listed
P1624-00 – Not listed
P2138-00 – Hand pedal correlation fault (CEL “on”, limp home mode, 30% torque reduction)