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I have an Error code 08 on my Deere 4520. The fault code…

Customer Question
I have an Error...

I have an Error code 08 on my John Deere 4520. The fault code guide says: "Throttle Sensor (TPS) Voltage signal out-of-range or not calibrated". I changed out the TPS out and have the same error! What is the secret to "Calibrate"?

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Equipment Mechanic I'm going to connect you with knows all the tricks and shortcuts.

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Submitted: 1 month ago.Category: Agriculture and Farm Equipment
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Customer reply replied 1 month ago
Hello
Customer reply replied 1 month ago
Hello is anyone going to answer my question?
Customer reply replied 1 month ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 1 month ago
Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 3 days by:
3/13/2018
Mechanic: Jeremy, Diesel Technician replied 1 month ago
Jeremy
Jeremy, Diesel Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 3,708
Experience: ASE Certified Medium/Heavy Duty Technician, Hydraulics, Electrical, Brakes Certified
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My name is ***** ***** I will assist you with your question today.

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Customer reply replied 1 month ago
If the fault code cannot be reset in the field without the JD software then I would like to know how! If not I have no option other than taking the tractor into the JD dealer. If you have a method of calibrating without taking into the dealer I am interested.
Mechanic: Jeremy, Diesel Technician replied 1 month ago

I'm not sure why this dropped me off the question.

Do you have the password ***** the machine to where you can get into the diagnostic 2 screen with the turn signal switch? If not, then JD will have to resolve this. Otherwise, if you can get into the diagnostic 2 screen, you have a single sensor calibration procedure that you can do. You select the throttle position sensor and then run. It will run the procedure and test it. You can then see the sensor voltage and you will then know if it is actually a calibration issue or the sensor itself is acting up.

You want to see the throttle lever position voltage range of 0.9v to 3.8v when moving it. If it is not in that range it will set the diagnostic code.

Also, the parameter for the TPS is Parameter 24 tP_X.X

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Mechanic: Jeremy, Diesel Technician replied 1 month ago

If you do have to go to the shop, ask them to show you how to get to the Diagnostic screen 2. It has a lot of things you can do on that screen to where you don't have to connect up all the time at the shop.

If you are able to get in there and the reading is out of range, check wire 673C which is the orange wire. It should have 5 volts. Then check wire 499 which is white. Verify that the voltage does go up and down with the pedal press and not under or over the threshold. If it does and you have the 5 volts, then replace the Throttle Position Sensor.

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Customer reply replied 1 month ago
Hello,
I was given the following code but it does not give me any response. Is the process below the correct sequence?John Deere Model 4520 e HydroPassword *****'s what I learned
1. Turn key to on position but don’t start Tractor
2. There is a switch above turn signal. Press and hold it for two seconds
3. Turn key off
4. The magic code is r-L-L-r-L-r. (Where r is right turn signal, l is left turn signal). This lets you edit, adjust stuff. When done press the flasher switch to save.
Customer reply replied 28 days ago
hello
Mechanic: Jeremy, Diesel Technician replied 28 days ago

I opted out. The JD tech messaged me that he was on to assist you, but you somehow locked me back on the question. I will opt out again so he can assist.

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Jeremy, Diesel Technician
Category: Agriculture and Farm Equipment
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