NX4510 HST RPM's Dropping CEL light

MinnesotaEric · Oct 2, 2018

JimR said:
I did that again tonight and it didn't make any difference. ?????? Is there a OBD2 plug on this machine? During the regen it ran for almost 30 miutes at 2600 rpm's. The exhaust is not plugged. It might be getting a bad reading which is putting it into limp mode.

OBD2? Yes. Under the hood above the radiator and another plug with the fuse box under the screwed down trim on the cab models.

JimR · Oct 2, 2018

EricTheOracle said:
OBD2? Yes. Under the hood above the radiator and another plug with the fuse box under the screwed down trim on the cab models.

Thanks Eric, I'll need to dig out my scanner and check it out hopefully tonight.

YLee Kioti · Oct 2, 2018

what kind of scanner treads tractor codes?
I have a Bosch OBDII and hooked it up but will not recognize any connection other then autos.
TIA

JimR · Oct 3, 2018

EricTheOracle said:
OBD2? Yes. Under the hood above the radiator and another plug with the fuse box under the screwed down trim on the cab models.

Hi Eric, My OBD2 Actron scanner will not communicate with my tractor. I bought this back in 2008. I think it may be obsolete for newer vehicles. It also does not have a tractor listing, only cars and trucks.

JimR · Oct 3, 2018

My OBD2 scanner would not read the codes or anything else on my tractor. I borrowed a much newer Centek scanner from my boss and tried that tonight. I couldn't read the codes but I could see what was going on. First of all I did clear the codes. Not sure if it did anything because it couldn't read them. So here is a list of anything that I thought important. At an idle the FRP-PSI was 134- 146. Catemp 32 catemp12 when first running was 370 degrees. VPWR (V) 14.17 Tac.PCT 94.1 EGR PCT 12.5 EGR ERR 0- .9 Baro PSI was .9 While running on regen here is what I had at 2600 rpm's . Tac PCT down to 15.7% CATEMP 1121 degrees I expect. EGREMP 0, EGRERR 0, When it went back to 1600 after the high speed regen the TACPCT went back up to 94.1 FRPSI was 40-42. The tractor will not run over 2000 rpm's consistently. If I leave it at full throttle it will cycle sometimes back and forth from idle to full throttle all by it self. Anything over 2000RPM"s makes the CEL light come on. On regen the tractor will run at 2600 wide open for a good 20 minutes which tells me there is no fuel blockage issue.

YLee Kioti · Oct 4, 2018

No fuel blockage- good summary
full 2600 rpm probably would not happen if the filter was even partially plugged, right?, not sure taking a stab at it.

So maybe a need for a ECM reflash?

Any feed back from your dealer? do they have the data that you posted here?

Regards..

JimR · Oct 4, 2018

YLee Kioti said:
No fuel blockage- good summary
full 2600 rpm probably would not happen if the filter was even partially plugged, right?, not sure taking a stab at it.

So maybe a need for a ECM reflash?

Any feed back from your dealer? do they have the data that you posted here?

Regards..

I did not buy my tractor locally. I bought it as a leftover for a lot less than a new one. The cost to buy this locally would have cost me an extra $6500.00. The nearest dealer is 30 miles away. I have not contacted him as I was hoping to have an idea of what is wrong first. There is no fuel blockage as it runs for almost 30 minutes on regen at 2600 rpm's. I'd have to borrow a friend's trailer to bring it there. That just may be what needs to be done. I'm going to check a few more things this weekend to see if it helps any.

MinnesotaEric · Oct 4, 2018

JimR said:
My OBD2 scanner would not read the codes or anything else on my tractor. I borrowed a much newer Centek scanner from my boss and tried that tonight. I couldn't read the codes but I could see what was going on. First of all I did clear the codes. Not sure if it did anything because it couldn't read them. So here is a list of anything that I thought important. At an idle the FRP-PSI was 134- 146. Catemp 32 catemp12 when first running was 370 degrees. VPWR (V) 14.17 Tac.PCT 94.1 EGR PCT 12.5 EGR ERR 0- .9 Baro PSI was .9 While running on regen here is what I had at 2600 rpm's . Tac PCT down to 15.7% CATEMP 1121 degrees I expect. EGREMP 0, EGRERR 0, When it went back to 1600 after the high speed regen the TACPCT went back up to 94.1 FRPSI was 40-42. The tractor will not run over 2000 rpm's consistently. If I leave it at full throttle it will cycle sometimes back and forth from idle to full throttle all by it self. Anything over 2000RPM"s makes the CEL light come on. On regen the tractor will run at 2600 wide open for a good 20 minutes which tells me there is no fuel blockage issue.

Check alternator voltage output above 2000 rpm. I had an alternator shell that triggered the CEL only after 2,000. I had no loss of power, however.

JimR · Oct 4, 2018

EricTheOracle said:
Check alternator voltage output above 2000 rpm. I had an alternator shell that triggered the CEL only after 2,000. I had no loss of power, however.[/QUOTE

The alternator s fine. The CEL light comes on just as the motor starts to sputter and go back to an idle. Once the motor goes under 2000 rpms the CEL light goes out. If you raise the throttle while it is messing up, the CEL light comes on as you reach 2000 rpms. I sent a email to Kioti explaining what is happening. Maybe they can answer this issue.

YLee Kioti · Oct 6, 2018

@JimR
Don't hold your breath waiting on Kioti. Hope I'm wrong and you do get a response.
Just that I have never gotten a response from them.
Most likely they will tell you to see your dealer.
Thanks for keeping us posted Most unusual for sure.