NT700 Throttle position sensor investigations
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- I investigate the possible causes of the alarming power surges on my NT700 (Deauville) which lead to a dangerous 'bucking bronco' type ride! I test the TPS 'insitu' and then locate and clean up all the connectors from the ECU through to the sensor. I also offer some observations on valve clearance (tappet) adjustments and on a coolant change in passing! Once complete the bike runs nicely (but I will update this post if the problem comes back. Only time will tell!)
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Just another update! Now 8,000 miles since I did your great fix! 59,240 miles total. Runs perfect!!! Thanks again for your video!!!!! God Bless.
Happy New Year! My bike is now approaching 70,000 miles since following your video! Thanks again!!!
Wow! great to know I was able to help. I have an idea that my issue was LACK of use as the bike is a 'summer toy' really.
I went in the garage after a long cold snap and noticed a light film of condensation all over the bike and wondered if this might be enough to start some oxidation on the rather poor quality electrical connectors around the engine. Hopefully the anti-moisture treatment should now be enough to keep that permanently at bay. Regards, Steve
Sounds like that might be the case. I wash my NT a good amount, which may have had the same effect. Thanks again Steve! I owe you a steak or seafood dinner! My wife and I are retiring soon and may do some traveling to the UK. Are you anywhere near London?@@astroideas9489
I just took my new to me 2010 9700 for a ride today here in October/2023. I only went on for about a half an hour after making all the personal adjustments and tire pressures, living things like the kickstand in the center stand pivot stuff like that. About five minutes out, I noticed a hesitation in the acceleration as I opened the throttle… I see that this machine has a throttle position sensor. I also see that they are problematic. I remember reading about throttle position issues with the early FJRs.. my new to me nt700v has 7500 miles on it.. I bought it from the original owner, who quit riding because of health issues.
The machine was always kept inside his house in the heated garage since new. I could tell by the number of spiderwebs there were wrapped around the center stand under the engine that the machine has been sitting for a while.
I am going to have my first experience working on throttle position sensor issues. I’ve had quite a few bikes with fuel injection, my Goldwing, GL 1800, my BMW, K 1200 LT ,my last to moto guzzis, my current Kawasaki Z 400 … none of those machines ever gave me even a single hiccup. But now I’m finding out that the NT 700 has issues on the first day of ownership, on a machine that appears to never have been modified or tampered with…
being a retired HVAC technician. I can agree with you that, most problems are electrical…
I will say, the issue seemed to have been clearing up for longer. I wrote it today… it certainly was not consistent. It only happened maybe five or eight times. I have a feeling the machine just needs to have a long run, A couple tanks of gas through it. That’s my plan of action before I start assuming the worst. I’m gonna try the simple things first..:
Sorry to hear your new NT is playing up - that is always a bit of a let down! Hopefully it will turn out to be one of the simple things - bad fuel comes to mind if it's been standing unused for a while. Plug caps have also been implicated (lots of info about this on the NT owners group pages) but it didn't fix my issues although it would be a good (cheap!) place to start. Annoyingly the plugs are a bit of a sod to get out.
You sound like a good mechanic so maybe a winter weekend may be a good time to go for it a treat every suspect connector you can find with some 'Oxgard' to nail the problem once and for all and before it ruins your enjoyment of a rather nice little bike (as it did for me for a couple of years) Good luck anyway and let me know if you manage to sort it!
Regards, Steve P
You can calibrate the TPS easily while it's in situ. The problem is access for the Torx driver as you mentioned. I clamped the Torx bit in a set of small molegrips and just cracked the bolts just slightly loose. Using the multimeter you can then adjust the position, as I recall, moving the rear part up slightly reduces the voltage ← _check this_
You don't need to move the TPS very much - your .509v is probably slightly over voltage and it needs reducing to about >=0.403v (Yes, I know the manual says 0.5v is in range but it isn't as it depends on a the value of the 5v line in the ECU - mine was a little over 5v - I think the calculation is covered on page 6-43 from memory) - Once I'd adjusted the TPS closed voltage to 0.403v the bike ran beautifully again - no kangarooing or hunting).
Note leave the multimeter in place and reading while you tighten the Torx bolts back up as it will move slightly (I set the voltage to 0.400v and by the time the bolts were tight, it was 0.403v).
For the valve clearance and coolant change I find it's easier to take the right hand fairing off.
Dielectric grease, sorted.
Could it be the injectors , would they be fault proof.
I know people with cars and trucks need them "cleaned" and or changed every now and then.
Would they be less effective at low speed, as needing less fuel through as of any gunk might be more inhibitive at lower fuel.
Cleaning kits are available.. as shown in video's.. cheaper than getting a mechanic to do it per the hourly rate.
Great video thinking my TPS is shot but not sure will give connections on loom a good clean an hope for the best.
Go for it! My feeling is that these TP sensors are actually quite reliable but the connections become poor and/or corroded over the years and the mere act of changing them out for a new TP sensors (or even worse the whole throttle body at $700 or so!) 'cures' the problem by just providing a good contacts again.
I have no actual evidence for this - it's just a hunch, after dealing with numerous problems and electrical faults caused by poor connections over the years in various scenarios!
My NT is still running fine since I posted this video. There has been no re-occurrence of the 'bucking bronco' effect - and I would have expected this to have happened if it really WAS a bad TP sensor.
Hope you are successful in fixing your problem too.
Regards, Steve
Thank you for your video! I am having the same issue with my 2010 NT700 with 51,200 miles. Have you ridden the bike much and has it cured the problem? Thanks again and Have a Merry Christmas from the U.S.A.
Glad you enjoyed it and that it was helpful. Not too many miles up since these checks and repairs but i a quietly confident the problem is resolved - but who knows with an intermittent problem! My NT has a fairly pampered life and is only 9000 miles in 12 years! It is always garaged, so slight corrosion/oxidation on the connectors would seem to fit bill rather better than a worn out throttle position sensor. In my experience poor connections cause far more problems than faulty components! Have a good Xmas too - Steve.
PS I am also considering the 'tweak' suggested in the comment below now I have a bit more experience of the system!
@@astroideas9489 Thanks again!
Just a additional update...800 miles later...still running GREAT! Thank you again for all help.
That's great to hear. Not used mine much recently (for various reasons) but I'm glad to hear that my work (whilst standing on the shoulders of others!!) has been helpful - AND I enjoyed making it as well!! Regards, Steve P
@@astroideas9489 Now at 1,400 miles with no PROBLEMS at all! Thank You! Thank You! Thank You!!!
Weird.. setting my clock from exact same times as in vid!