Maybe the early TPS values (when the manual was written) were different to the later ones ?
Mk2a 2000 in Silver. Top end Refurb @ 41100 miles, Scottoiler, Renthal Road High Bars, Up & Back Bar Risers, Bellypan, DL650 Handguards, Capt. Picard Bar Ends, House of Henty SS Wheel spacers, New Seat Cover Fitted.58 MPG !!Now owned by chrisbee !Studley's mk2a Bloggerydoodaah !Photos of my first MK1Photos of my MK2aTPLQHCSRSFC No. 1 Fan
I just checked the TPS maximum resistance value : 4.96KΩ
Glad I found the standard value !
As a reminder : the resistance must be checked with the TPS unplugged.
This is very important, otherwise the value will be biased by the other sensors.
I suspect this is the reason why some folks here don't have the correct value.
Then I checked the DIAG mode, it showed min-max values : 11-95.
I had to adjust it, it was a pita, I had to remove the four screws to release the throttle body assembly and with my third hand I made sure none of these screws felt inside the intake pits !
They are hard to test correctly! i.e chart them at each 1deg. I have a SnapOn diag that does just that, there are even companies who offer TESTED TPS sensors as they can often throw up spikes from new.
How about a little project for you, Arduino?
Edited by arthurbikemad, 23 June 2016 - 08:02 am.
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They are hard to test correctly! i.e chart them at each 1deg. I have a SnapOn diag that does just that, there are even companies who offer TESTED TPS sensors as they can often throw up spikes from new.
How about a little project for you, Arduino?
I want one like this !
JBX,
Something is wrong, I do not know what it is but I checked my TPS sensor again also my new multimeter.
I checked on pin 1 and 2 like you said on your website
Greetings, Frits from holland
Did you mean you checked the resistance with two different ohm-meters ?
Maybe this meter was built for the UK market and gives resistance values in imperial ohms...
If the ECU produces a linear response from circa 17 to 98, then isn't the TPS doing its job whatever the resistance values?
You're right, but this max resistance problem is very strange and I'd like to know the end of the story !
- A TPS is basically a potentiometer, and if you apply a voltage of, say, 10V across it, the voltage between one endpoint and the slider will be 0-10V as you turn the potentiometer.
The only way the total resistance will come into play, is that load you attach to the "output"; A 1kohm load will actually make the voltage unlinear relative to the rotation, but still give 0-10V.
An incompatible TPS could at worst give unlinear input, the consequences I wouldn't know.
Chances are good 2.42, 4, 6 or even 1 kohms won't matter.
This evening I measured the IAT sensor : 2.3KΩ @25°C, instead of ~500Ω @ 20°C (Workshop Manual) !
I suspect this is actually the same temperature sensor than the water temperature sensor, as the latter is rated as follow :
● 20°C (68°F) : 2,32–2,59 kΩ
● 80°C (176°F): 0,31–0,33 kΩ
● 110°C (230°F): 0,14–0,15 kΩ
I guess to reduce production costs Ms Yamaha put the same temperature sensor for the air intake & the coolant, then did a little change inside the ECU code. The problem is that the guy who write the WM is not aware of the mod.
Other WM (FJR1300 & XTZ1200) are sometime a bit funny : the IAT standard resistance is given at 80°C !
It may be that the resistance doesn't matter:
- A TPS is basically a potentiometer, and if you apply a voltage of, say, 10V across it, the voltage between one endpoint and the slider will be 0-10V as you turn the potentiometer.
The only way the total resistance will come into play, is that load you attach to the "output"; A 1kohm load will actually make the voltage unlinear relative to the rotation, but still give 0-10V.
An incompatible TPS could at worst give unlinear input, the consequences I wouldn't know.
Chances are good 2.42, 4, 6 or even 1 kohms won't matter.
Agree, the ECU have high-impedance analog inputs so the linear output of the potentiometer is not affected.
Put a new air filter in during the week and now have a much more responsive bike. Didn't bother trying without the airbox top on, but if it's this much better I'm starting to wonder...
Have to admit I neglected to change it at the recommended mileage though.
