Help - Idle Stepper Test Malfunction

[tdragger]

After completing a Primary Throttle Position Sensor install on my 2006 Triumph Rocket III, I double-clicked the "Idle Stepper" test. I could hear the "ugnn....ugnn....ugnn....ugnn...." sound of the stepper motor working. I waited for it to stop. and waited. and waited.... I checked the TuneECU screen and it said the Idle Stepper test was done but the test seemed to continue.

I started the bike and it seems to run just fine. After shutting it down, I turned the key on again and after it completes the gauge sweep and then starts the "ugnn...ugnn...." sound again.

Should I run the “Adjust ISCV” test. If so, what do I need to do? The documentation says refer to the workshop manual but I can seem to find any reference to adjusting the ISCV in the Rocket Service Manual.

Help Please!!

 

[Power-Tripp]

It is nothing more than a servo motor. It pushes an arm in and out. All it does is pushes against the throttle shaft to alter idle rpm. You cannot adjust it, but you can test it.

If it fails, try removing it - 2 Phillips-head screws on the left side, and disconnect the connector. Then clean the arm as well as possible with WD-40, then carburetor cleaner. It likely has grit inside the arm shaft. Check the connector as well.

Put it back on and test it again.

If this doesn't work, you can either replace it, or remove the resin covering the screws and take it apart completely to clean it better. The older 955 Daytonas and Speed Triples had some issues with the same stepper design, but this tends to be less common on the later steppers. But they can still build up grit on/in the arm shaft that causes than to not work as intended.

I hope this helps.

 

[tdragger]

problem sorted.

I had set the TPS voltage from the Diagnostics page to read a perfect .060. This apparently wasn't the right thing to do and it threw the ISCV out of adjustment.

When I went through the "Adjust ISCV" process, all was returned to normal.

 

[Gothlander]

You can adjust the iscv by turning the nut that connects to the throttle arm. In Tune Boy you adjust it to suit the set idle speed by referring to the actual idle speed (both the REF idle and the actual idle speed are visible in TuneBoy) and turn the nut until they are the same. The set idle speed is the one that you set on the idle tab inTuneEdit.

It is nothing more than a servo motor. It pushes an arm in and out. All it does is pushes against the throttle shaft to alter idle rpm. You cannot adjust it, but you can test it.

If it fails, try removing it - 2 Phillips-head screws on the left side, and disconnect the connector. Then clean the arm as well as possible with WD-40, then carburetor cleaner. It likely has grit inside the arm shaft. Check the connector as well.

Put it back on and test it again.

If this doesn't work, you can either replace it, or remove the resin covering the screws and take it apart completely to clean it better. The older 955 Daytonas and Speed Triples had some issues with the same stepper design, but this tends to be less common on the later steppers. But they can still build up grit on/in the arm shaft that causes than to not work as intended.

I hope this helps.

 

[Power-Tripp]

Goth,
Yes and no.
What I have found is that if you alter the length of the stepper arm with the nut, the ECU tends to eventually adapt and try to alter the stepper settings to best meet the multiple settings in the ECU. This doesn't always match up to where the idle rpm is set - it is also trying to balance with the stepper setting and idle MAP signal settings not available in TuneEdit or TuneECU. In these cases, adjusting the arm length can be a good option, but sometimes it is only temporary.

Altering the stepper nut and resetting the stepper can help, but I have found that it can also cause a few off-idle issues as well. If we just had access to a few more sensor tables and targets...

There are a few differences in TuneEdit and TuneECU. Some of the idle references and targets seem different, and some TuneEdit maps do not convert to TuneECU's tables well. This can cause a few issues at idle and off idle.

I have seen a few bikes that have idle issues no matter what, and it looks to be a stepper issue. I have even considered removing the stepper on one bike and replacing it with a bypass valve. If I had access to the stepper table, I would do this, as a valve tends to be a much better solution to increase resolution. This is why many OEMs go this route in the automotive industry.

I am sure you and a few others will find issues and cures that I will miss.

With TuneECU being as new as it is, I am finding small issues every time I use it on different bikes. Eventually we will get this all ironed out.