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June 3rd, 2012, 04:21 PM   #1
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70 deg. single spark throttle position sensor

I had an issue last week. I dropped my 2011 fe 390 on its side. Nothing hard. The tip over sensor tripped, the bike turned off. I picked up bike, started it, and off i went, for another 30 seconds anyway. The bike started to sound rough and more jolty when I gave it gas. Then it stalled as if I had hit the kill switch. I removed the spark plug cap and unscrewed the cap from wire to test for spark, I got a single spark. Long story made short I figured out that a faulty throttle position sensor was causing this effect.
A test for this spark condition is to disconnect the tps sensor. If you then get multiple sparks then your tps sensor is bad. A functioning tps should put out approx. .6 volts when the throttle is closed and up to 4.7 when the throttle is wide open.
The resistance on mine with the throttle closed was at 4.4 volts and 4.9 open throttle. I used a fine pin to stick into the yellow wire lead at the connector. With the sensor connected, start the bike. Using a voltmeter set to dc volts, i clamped the positive lead of the voltmeter to the pin and neg to ground. the blue wire(+) should read 5 volts when starting the bike. The yellow wire then tells the ecu not to start or spark because it senses that my throttle is nearly in wide open position.
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June 3rd, 2012, 09:29 PM   #2
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Re: 70 deg. single spark throttle position sensor

Very interesting.
I would like to see a different title for the thread though. Suggestions? How about something like "Poor spark? Check your TPS"
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June 4th, 2012, 05:53 AM   #3
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Re: 70 deg. single spark throttle position sensor

TPS needs to show closed voltage to the ECU on start up .601 volts. The 5 volts you were seeing is the imput voltage to the TPS, what the bike is sending to it. If you see this for the TPS output I would think it is broken.


Here is a link to a thread about a testing tool you may want to make. Someone else did the homework I am just sharing info I found.

TPS testing tool:
http://www.slednutz.com/showthread.php?t=4044


With the tester:
TPS test box wire go to - ground to ground prong, hot(red) to 5v in - use the other ground connection for your volt meter ground and then touch the red from your meter to the remaining prong in the connector. On your volt meter you should see .601 volts for a correct TPS setting. If is shows different than .601 on closed throttle loosen screw and move TPS and you will see the voltage change and set to correct setting.


Chris

I have one I made for myself I do not need any longer if someone wants to help me get my money back for the parts - $25 shipped.
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August 18th, 2013, 05:31 PM   #4
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Re: 70 deg. single spark throttle position sensor

I built the box this weekend and checked my TPS. It was set a .584 and I got it adjusted to .601-.603. It seemed to move slightly as I tightened it. Is .584 enough to make it hard to start??
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August 18th, 2013, 07:13 PM   #5
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Re: 70 deg. single spark throttle position sensor

Originally Posted by Electrified
I built the box this weekend and checked my TPS. It was set a .584 and I got it adjusted to .601-.603. It seemed to move slightly as I tightened it. Is .584 enough to make it hard to start??
I don't know for our 70d bikes, but the current husa/ktm 350s need .610 to run really well and not flameout in rough sections.
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September 14th, 2016, 02:53 AM   #6
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Just rebuildt my bike with a complete rally kit. So more air in, and easier flow our The exhaust with underpipe made The bike blow when i let The gas down.
Figured il check tps, was at 0,585 set it to 0,601 and it hardly rsn at all when i was at low revs. Tryed a bit higher, same result.

Back at 0,586 now it works again. Why is this? Is it leaner now or when i set tps higher?
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September 14th, 2016, 03:26 AM   #7
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Originally Posted by Palle View Post
Just rebuildt my bike with a complete rally kit. So more air in, and easier flow our The exhaust with underpipe made The bike blow when i let The gas down.
Figured il check tps, was at 0,585 set it to 0,601 and it hardly rsn at all when i was at low revs. Tryed a bit higher, same result.

Back at 0,586 now it works again. Why is this? Is it leaner now or when i set tps higher?
Good question! From googling around it seems like low voltage = leaner, high voltage = richer. (Because low voltage indicates less throttle opening so less fuel? And vice versa?)

This link has the closest to a clearest guess / statement on it that I found: 500,450exc fuel injected TPS adjustment to richen mixture and eliminate flame out. - KTM Forums: KTM Motorcycle Forum
Thanks from jon andersson and 3nduro
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September 14th, 2016, 05:53 AM   #8
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Cant Remember counter or anti for less or more volts atm. So im gonna run it a bit further to see and feel.
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September 27th, 2016, 10:11 AM   #9
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Found an answer i thought we all should learn.

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September 27th, 2016, 06:40 PM   #10
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Asked about TPS tuning tool and it will work on 2011 Husaberg 570, 450, 390.
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