ERROR CODE 08 AND WARRANTY PROCESS

[Superduper]

Hello,

I have 2 questions today:

(1) Anyone have any experience with error code 08 on a JD3120 tractor? Code just started happening. Don't observe anything particularly amiss with tractor but don't want to take any chances on messing it up by continuing to use it. If it's something simple, then I would prefer to correct it myself rather than send it back for warranty claim (see below).

(2) Tractor is well within warranty but dealer is 60 miles away and I don't have a trailer to transport it with. I figure renting a trailer plus the gas to go there and back will probably run close to $100, excluding my time and trouble for the transport, and then I'll need to do it all over again when the tractor is fixed. When they dropped off my tractor, they wanted $200 for delivery. What is your experience with JD dealer when processing warranty? Will they pick-up or provide on-site warranty service, or is it strictly warranty at the dealership only? Do they charge if picking up or servicing on site? Oh yes, I should say that the tractor is only a few months old and hasn't even eclipsed 10 hours of use yet.

Thanks for your time.

 

[JD3520]

Err 08
Throttle Sensor.
Voltage signal out-of-range or not calibrated.
No anti-stall function; Loss of performance.
Contact your John Deere dealer.

You might try disconnecting your battery cables for 15 minutes and then connecting them again. Also check for a loose, broken, or gounded out wires. I have not personally had this probelm on my 3520 but another TBN'er solved his cruise control problem by disconnecting the battery and the tractor "reconized" the input when he connected the battery back up.

Hope this helps.

 

[rvtech]

IMHO, the dealer will probably charge for pick up and delivery. My 2305 has a dealer installed decal that says transportation under warranty is not included. Mine had to go back 1 time for a new radiator under warranty and I simply asked if they would include the transportation because of other issues I was having. (promised backhoe brackets were not available) My dealer did not charge for transportation this 1 time.

Though I am not a Deere dealer, I have some understanding of how warranty works. I normally would not expect my dealer to transport my subcut for free. I realize in many cases warranty work is costing the dealer money. I'm quite certain they will not be reinbursed by the manufacturer for transportation.

 

[Superduper]

You might try disconnecting your battery cables for 15 minutes and then connecting them again. Also check for a loose, broken, or gounded out wires. I have not personally had this probelm on my 3520 but another TBN'er solved his cruise control problem by disconnecting the battery and the tractor "reconized" the input when he connected the battery back up.

Thanks for the input. This weekend, I'll try doing the battery thing. When the code occurs, I can get rid of it by shutting off and restarting the motor. But as soon as I try to move the tractor, it comes back on. I think I'll also disconnect the connector at the throttle sensor and clean/treat it with oxidation remover. If that doesn't work, depending upon the cost, I may replace the throttle sensor as it may be more cost effective than going the warranty path. Sure could use a service manual though because on automobiles, there is a procedure for adjusting the throttle position sensor when it is replaced.

 

[Willl]

Yes, they will hit you with a service charge if they come out to you. Regardless of warranty.

 

[RogerH]

This could be real easy to fix if the sensor has not crept too far out of range.

First out of curiosity, do you see this error happening more with the throttle pulled back or pushed forward all the way, or does it not make a difference?

Try the following to recalibrate the throttle sensor:
1. Turn on the key switch (tractor doesn't have to be running).
2. Pull the throttle lever all the way back.
3. Disconnect the connector at the throttle sensor for a few seconds.
4. Plug the connector back in.
5. Wait a few seconds then push the throttle lever all the way up.
6. Wait a few seconds and you are done.

If successful, you should not see anymore error codes. Let us know how it works.

 

[3720_Owner]

Yes, they will hit you with a service charge if they come out to you. Regardless of warranty.

May not always be true. The 300CX on my 3720 started leaking at one of the cylinders. Called the dealer and explained I did not have a good way of getting it to them. They "guessed" it may be the seal on the cylinder and sent a tech with the seal repair kit to my farm. Turns out it was a pin hole leak on the back side of the cylinder so the tech headed back to the dealer and picked up a new cylinder. A couple of hours later he was back, put it on in 10 minutes and thanked me for being a good customer. I felt bad that I made him spend 4 hours on the road going back and forth to get parts, but he would not take a tip, just said it was part of job. Didn't charge me a thing for any part of the repair. Glad I found this dealer. Doubt I will look anywhere else when it comes to buying the tiller, PHD, landscaping rake, gator, and any other toys ... I mean important farming tools.

Steven

 

[Willl]

May not always be true.

True, and I should of stated it differently.

They can if they choose to, according to the warranty contract.

 

[Superduper]

This could be real easy to fix if the sensor has not crept too far out of range.

First out of curiosity, do you see this error happening more with the throttle pulled back or pushed forward all the way, or does it not make a difference?

Try the following to recalibrate the throttle sensor:
1. Turn on the key switch (tractor doesn't have to be running).
2. Pull the throttle lever all the way back.
3. Disconnect the connector at the throttle sensor for a few seconds.
4. Plug the connector back in.
5. Wait a few seconds then push the throttle lever all the way up.
6. Wait a few seconds and you are done.

If successful, you should not see anymore error codes. Let us know how it works.

Hello guys. Thanks for all the tips. Before calling dealer for assistance, I will try all suggestions. I believe that it should be an easy adjustment however, I AM disappointed that it should require adjustment at all, let alone replacement at 10 hours. On cars, the throttle position sensor is basically a rheostat that is adjusted at idle speed. Using a voltmeter, the sensor is rotated on a pivot until a desired voltage (i.e. .5v) is reached, depending upon the specifications for that vehicle. This voltage will be the baseline for the computer, and the computer uses this voltage as feedback to determine the amount of fuel that needs to be injected. Any reading outside of the normal parameters will cause computer to set an error code. The problem in this case is that without a service manual, the specifications and measuring procedures is unknown. So regardless of how easy a procedure this might be, I might not be able to do it without the specs. I'm guessing the service manual will set me back $150 or so but I will probably have to take that plunge as I venture I'll be doing more future work on the tractor. BTW, RogerH, there doesn't seem to be anything specific that will cause the code, at least not that I've noticed. The throttle could be at idle, or it could be up. I've seen it happen at soon as I tap the brakes. I've seen it happen when the tires slip, which occurs rather easily in loose soil, and I've seen it happen as soon as I hit the HST pedals. There is no particular pattern. I will post any fix as soon as I have one. Those of you who are interested can subscribe to this thread as it might take some time. I've got the week all lined up with work and the forecast for the weather is not good.

Well, went ahead and ordered Technical service manual on CD. With tax and shipping, comes to around $75. The printed version is $130 before tax/shipping. Once I get the manual, I'll be able to adjust the sensor, and if that doesn't work, then the sensor is $69 part. Will advise once it is fixed.

 

[Keoke]

Superduper, good idea to spend the bucks on the manual instead of a tow.
No biggie, but the throttle sensor in not a rheostat, it is instead a potentiometer. Rheostat have only two wires and pot's have three wires.
As you say 5v (reference voltage) is dropped across a fixed resistor and a tracker contact hooked to throttle is moved across the resistor sending a variable voltage to computer. Full throttle will give around a 5v signal half throttle about 2.5 volts.
Also, pots can be used as rheostat's (two wires) but not the other way around.

good luck,