Open throttle TPS voltage is way low - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL1000 from 2002-2012 DL1000 from 2002-2012 (K2-L2)

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post #1 of 20 Old 07-19-2015, 05:25 PM Thread Starter
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Open throttle TPS voltage is way low

K3 DL1000.
Was about to mess with fuel maps on my FI Tuner Pro and the first thing the software wants you to do after connecting is calibrate the TPS. OK - fine. So, the software tells me to fully open the throttle so it can measure the "open" TPS voltage. I can see the voltage increase as I pull back, and it stabilizes at 2.37V (wide open throttle). Waiting for the software to say "ok, now do this", but nothing else happens - like it's still waiting for me to open the throttle. Well - I think I finally figured out why. It seems that the TPS spec voltage range is 1.1V (closed) to 4.3V (open). My measured CLOSED voltage is 1.09 (close enough), but my WIDE OPEN voltage is 2.37. This seems WAY LOW, so my questions are:
- Does this mean that my TPS is bad and needs to be replaced?
- Is the TPS resistance/voltage adjustable - meaning, can I somehow increase the TPS OPEN voltage to 4.3V? (I wouldn't think so.) The only TPS adjustments I've seen are the two adjustment screws used to get the middle and top LCD bars set to the correct RPMs (and I believe mine is ok - the last time I checked).
- How the heck can this thing be running ok (I think) if the TPS voltage output is so messed up?
- And finally, where's the best place to buy a new TPS?

Thanks!
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post #2 of 20 Old 07-20-2015, 12:27 PM Thread Starter
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Anyone? Basically, just trying to determine if I need a new TPS. Thanks...
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post #3 of 20 Old 07-20-2015, 01:29 PM
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Did you check the input voltage? If that's okay, I'd think the TPS was bad or out of adjustment. You want the -C00 leading dash to go upward at 1500-1800rpm on a Vee.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #4 of 20 Old 07-20-2015, 01:57 PM Thread Starter
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Quote:
Originally Posted by greywolf View Post
Did you check the input voltage? If that's okay, I'd think the TPS was bad or out of adjustment. You want the -C00 leading dash to go upward at 1500-1800rpm on a Vee.
Thanks GW. Nope - haven't checked the input voltage. I'll check tonight - hoping I can do it without removing the tank and air box. I'll also double-check the TPS adjustment in dealer mode (which, I believe, was fine the last time I checked).

Question - if a TPS is bad, is it still possible to adjust it so that the -C00 leading dash moves up at 1500-1800 rpm? Wouldn't that scenario be misleading, and essentially mask a fundamentally bad TPS?
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post #5 of 20 Old 07-20-2015, 02:12 PM
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A bad TPS is normally intermittent and more likely to have problems when hot. I don't know of a reliable test for a bad TPS as it can test fine one minute and be wonky the next minute.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informa...-you-have.html
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post #6 of 20 Old 07-20-2015, 03:53 PM Thread Starter
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Got it. I guess that explains why I've read so often (on this forum and others) "try replacing the TPS", or something to that effect. Fair enough. Thanks again, GW!
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post #7 of 20 Old 07-21-2015, 10:27 PM Thread Starter
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Hoping this is an easy question for someone...

I measured the TPS input voltage at approx 5V - so that looks good. Then I removed the TPS from the throttle body (leaving the coupler still connected) and measured the ouput voltage while manually rotating the TPS with a screwdriver. The outputs were 0V when "closed" (TPS at rest; fully counter-clockwise) and 5V when "open" (TPS turned fully clockwise under spring tension), and are exactly the values I would expect. The TPS appears to be fine. The issue seems to be that the throttle valve is not opening enough at full throttle to allow the TPS to get anywhere close to 4.3V. The range of motion of the TPS from 0V to 5V is 90 degrees, whereas the throttle is only opening about 30 degrees. This can't be right, can it? How far should the throttle valve open on a K3 DL1000? For the life of me, I can't find this info anywhere - but I would guess at least 60-70 degrees, right? Finally (I apologize for my ignorance), is it possible to adjust the maximum opening of the throttle valve (at full throttle)? Is it done by adjusting the throttle cables, or is there a set screw maybe? Very confused at the moment...
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post #8 of 20 Old 07-21-2015, 10:50 PM
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That doesn't sound right at all. It's a situation with which I am not familiar. Maybe a Vee rider can chime in.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informa...-you-have.html
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post #9 of 20 Old 07-22-2015, 01:02 AM Thread Starter
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Any Vee owners care to enlighten me? How wide (i.e., degrees of rotation) should the primary throttle valves open up at full throttle? Is it adjustable, and how would you do it? Thanks...
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post #10 of 20 Old 07-22-2015, 02:06 AM
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You might get some help from this thread: Wrong conclusion - broken TPS & symptoms

Dennis

'12 650 Adventure

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