S&S Cycle USB Magneti Marelli Style VFI (Variable Fuel Injection) Module and ProTune II Software - Manual (Page 12)

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3- Base Hot and Cold Idle Screw Settings for 1550cc (95”)
a- Apply a small amount of blue Loctite® to the cold idle screw. Install the screw and adjust until the throttle voltage is showing 0.64-0.68v
when viewed on the gauge panel in ProTune II.
b- Lightly open and close throttle to verify setting.
c- Apply a small amount of blue Loctite to the hot idle screw. Install the screw and adjust until the throttle voltage is showing 0.70v
d- Lightly open and close throttle to verify setting.
e- Reconnect the plug to the IAC motor.
4- Final Idle Speed Adjustment
If issues with the engine idle hanging high or engine stalling occurs when returning to idle, the Idle Air Control (IAC) motor calibration may
need to be adjusted. Engine idle RPM is controlled by a stepper motor that controls the amount of air flow to the engine during idle conditions.
During idle operation the stepper will move in an increasing number of steps to raise engine RPM and will reduce the number of steps to slow
the idle speed.
The process of calibrating the stepper motor involves adjusting the Stepper Position with Temperature Map so it more closely matches the
values used during idle control. Use the following steps to complete the stepper motor calibration:
a- Allow motorcycle to cool completely. Engine must be at room temperature before starting this procedure.
b- Connect a PC to the ECM, open ProTune II on the PC, turn on the ignition switch, and set the run/stop switch to run. Do not start the
motorcycle at this time. The bar in the lower right corner of ProTune II should turn green to show it is communicating with the ECM. If
communication is not established see the basic trouble shooting section of these instructions.
c- Be sure that ProTune II is operating in “Advanced” mode. Selection between the Advanced and Basic levels of ProTune II can be found in the
menu item “Select User Level…” under the Options menu of ProTune II.
d- Under the View menu in Pro Tune 2 select “Stepper Position with Temperature Map”. In the window that opens select the ECM (default) and
hit OK. This will open the stepper position with engine temperature map from the ECM. This map will show the number of step the stepper
motor is open versus the temperature of the engine. Take note of the temperature intervals on the map.
e- From the top row of icon in Pro Tune 2 select the “Gauge” icon this will open the gauge panel showing the current engine operation. Identify
the panels for engine temperature and stepper position on the gauge panel.
f- Start the engine and allow it to idle. As it warms up, take note of the stepper position shown in the gauge panel at each engine temperature
corresponding to a point on the stepper position with engine temperature map up to 250° F engine temp.
g- Input the values recorded above into Stepper Position with Temperature Map in ProTune II. For engine temperatures outside of the area
tested, carry out the trend of the graph to smooth it out.
h- To save the tuned map to the ECM select “Save” from the top row of icons in ProTune II. In the new window that opens select the ECM
(default) and hit OK.
i- Turn the ignition switch to off for at least 15 seconds before starting motorcycle.
If you find during the above procedure that the hot idle speed is too fast and the Stepper Position = 0 (fully closed), the hot idle screw may need
to be backed out slightly and the above procedure repeated.