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Re: Re: Re:[ST] 99 Sprint ST fault codes and Idle or stallingproblem.continued



Chris and Stephen

The Factory manual shows Air Inlet Temp sensor between 11 and 34 on the...

I would expect the ECM to measure the
throttle position at startup and calibrate it to zero (my guess) so
don't worry about 10% fully closed.

In fact no. There is a calibration procedure. You can have a look at the australian guy tools manual.
http://www.tuneboy.com.au/Tutorials/TuneBoyTutorial.html.


There is actually a relative trottle pos and corrected trottle pos. But the corrected one is not
accessible w/ the supported standard OBD codes. It's the extended code 69 not supported by this ECU.

What I understand and more or less experienced is that when you lower the idle voltage by unscrewing
the two screws and then moving slightly toward the right (counter clockwise), next time you start the bike,
the ECU will adjust it.


That's why they say instead to set the corrected value to a too hight voltage on purpose. But for that you need the game-boy(triumph) or the tune-boy. W/o you can just move the sensor (engine stopped) to get a lower voltage than what is stored in the ECU.

But this is valid only if the corrected idle voltage set in the ECU is not too low.
I couldn't swear about the clockwise vs counter clockwise. It's a tricky tune w/o their tool. Even more tricky on a pre 2002.


In conclusion: You shouldn't have a zero volts at zero pos. Relative trottle pos at 10 % seems OK. If the relative trottle pos
is not good, the ECU would think either the trottle is a little open when closed and then put more fuel (hight consumption
driving in town when often idling), or the ecu will think your trottle is closed when it's not, run too lean too soon
and conduct for example to stall when releasing the trottle too fast and/or having a poor idle.

Fred 02 ST BRG






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