P336 code
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North Idaho Wolfman
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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
What exactly are you working on as the codes vary per machine. 
Most likely: Crankshaft position sensor (NE sensor) abnormality.
Most likely: Crankshaft position sensor (NE sensor) abnormality.
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Looking at a table for P codes, and I have some questions, although the answers might help me more than you. Agrees with what NIW said, it has something to do with crank shaft position sensor.
Says it can be caused by failure of sensor or short or open circuit in wiring harness.
Says the error will be cleared if you shut off tractor. Did it? If so, maybe it was a momentary change in the number of pulses counted by the sensor.
Says there is a limp home condition of 75% power. Were you able to finish mowing or did you notice a decrease in power after the code came up?
Says if the malfunction continues, there will be difficulty starting, large vibration, and insufficient output. How is it running now?
So to start with, I'd suggest going out and trying to start your tractor and see if it is behaving "normally" first, if not, look for some problem in wiring harness, third talk to dealer about a new sensor....just guessing here.
Says it can be caused by failure of sensor or short or open circuit in wiring harness.
Says the error will be cleared if you shut off tractor. Did it? If so, maybe it was a momentary change in the number of pulses counted by the sensor.
Says there is a limp home condition of 75% power. Were you able to finish mowing or did you notice a decrease in power after the code came up?
Says if the malfunction continues, there will be difficulty starting, large vibration, and insufficient output. How is it running now?
So to start with, I'd suggest going out and trying to start your tractor and see if it is behaving "normally" first, if not, look for some problem in wiring harness, third talk to dealer about a new sensor....just guessing here.
North Idaho Wolfman
Moderator
Staff member
Lifetime Member
Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
As said, it's an abnormality with the crankshaft position sensor. Sensor is located on the RH side of the bellhousing. It reads off of 90 holes in the flywheel. A couple of the holes are spaced differently and the sensor reads that difference to judge where TDC #1 cylinder is, hence the term "crankshaft position" sensor.
There's quite a few things that can cause the ECU to "throw" PO336, and you're going to have to give us more information. We now know that you were bush hogging when the code came up. How old is the tractor? What was the conditions while bush hogging when the code popped up? Engine bogged down pretty good or? Have you checked the sensor location? BTW if you have a front end loader on it, the sensor is impossible to get to because the loader frame is in the way. Has this code ever come up before? How many hours are on it?
You don't want to just ignore the code. When that code is set in the ECU, the tractor horsepower is de-rated to about 85% or thereabouts and it also messes with the function of the DPF and regeneration cycle. Failure to repair the source of the PO336 code can result in a DPF soot level 4 and 5 which is not regenerationable and thus the DPF would have to be removed, cleaned professionally (baked), and reinstalled, then the soot level has to be reset as well as the regeneration time interval; both of which require proprietary software and expensive hardware. So don't ignore it.
There's quite a few things that can cause the ECU to "throw" PO336, and you're going to have to give us more information. We now know that you were bush hogging when the code came up. How old is the tractor? What was the conditions while bush hogging when the code popped up? Engine bogged down pretty good or? Have you checked the sensor location? BTW if you have a front end loader on it, the sensor is impossible to get to because the loader frame is in the way. Has this code ever come up before? How many hours are on it?
You don't want to just ignore the code. When that code is set in the ECU, the tractor horsepower is de-rated to about 85% or thereabouts and it also messes with the function of the DPF and regeneration cycle. Failure to repair the source of the PO336 code can result in a DPF soot level 4 and 5 which is not regenerationable and thus the DPF would have to be removed, cleaned professionally (baked), and reinstalled, then the soot level has to be reset as well as the regeneration time interval; both of which require proprietary software and expensive hardware. So don't ignore it.
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I started it this morning and it still shows that code. I’ll try to use it tomorrow and see if it had a loss of power.
It is possible you have to clear the code from your dash. Mdhughes has posted the procedure for the 3901. It is in the wsm, if you don't have the wsm let us know and someone will search for it. If it doesn't clear and stay cleared, heed lugbolt's warning and don't run it in "limp mode" so you don't end up with two problems instead of one when it can't run a regen.
I’m the guy that had the problem with a stump damaging my sensor. I had a buddy replace it but it still doesn’t work. Tractor won’t start and code comes up again even after clearing it. He put an ohm meter on the repaired harness plug and it’s good but when he tried the ohm meter on the new sensor it doesn’t show anything. Should the ohm meter show a connection when touching the sensor terminals? Maybe I got a bad replacement sensor? Anybody know if the ohm meter should show a connection when touched to the sensor? My local Kubota dealer is not too helpful.
Thanks
Rod
Thanks
Rod
The Crankshaft position sensor is a Hall Effect sensor, the resistance should not be zero or infinite. You can check to make sure you have 5V between position 1 on the connector and ground with the key on. You can also check the resistance between connector 2 and 3 on the sensor itself.
15-Aug-2018 17:35
I changed it to 5V from 12V, that is what happens when you post so early in the morning. Thanks wgator for posting the right voltage.
Rod, did you clear the P0336 code after you changed the sensor?
15-Aug-2018 17:35
I changed it to 5V from 12V, that is what happens when you post so early in the morning. Thanks wgator for posting the right voltage.
Rod, did you clear the P0336 code after you changed the sensor?
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If you don't already have the Work Shop Manual download it HERE . PDF page 204 has the installation procedure for the sensor which requires setting air gap of 0.002 to 0.059 inch and torque of the mounting screw and says: IMPORTANT, If you drop the sensor, do not reuse it. In the WSM pdf page 645 has the test procedure with a NOTE: Since it is not possible to do unit checking for this sensor, judge the sensor is damaged if the relating electric circuit is normal (key switch ON, pin 1 of connector to chassis unpainted ground should read apps. 5 volts). Also using pdf page starting at 623 (ECU connector) check position sensor connector pins 2 and 3 to ECU connector for continuity. Hope this helps.
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That's because Kubota doesn't give the dealers a lot of info to go on. You have to physically go halfway across the country to a hands-on school in order to get good info out of them. That's sad, IMO, but it does give tech's and dealer principles an incentive to get trained up-to better help their customers.
The sensor can't be tested with a traditional ohm meter. Well it "can" but you also need the correct adapter for the meter to read it. For 99% of us, out of our budget and knowledge base. So I don't worry with that. Even with the correct stuff, the readings don't tell you whether it's "right" or not because Kubota doesn't give any specification for it.
You can't clear the code from the dash and expect it to stay "cleared". Kubota screwed around on these. You can clear it, but because the code is also stored in the ECU, it'll just come back and pop up in the dash again. Yay. Only way to clear it from ECU is with diagmaster-which is proprietary to Kubota and their dealers. So basically you have to take it to a dealer and have it cleared once the necessary repair(s) are completed. I don't like it but I understand why they do it
PO336 can be a lot of things, so if a sensor doesn't fix it, test the wiring between the sensor connector and the ECU; there's 3 wires as I recall. Look for excessive resistance. If resistance is high, you have a wiring problem and/or corrosion. If not, there are several possibilities ranging from a flywheel issue to ECU issue to ECU connector corrosion, of those 3, I have seen all of them-and then some. But 99% of the time it's wiring related, trail debris knocking wires off, rats, mice, squirrels, etc.