S&S Cycle USB Magneti Marelli Style VFI (Variable Fuel Injection) Module and ProTune II Software - Manual (Page 10)

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BASIC TROUBLESHOOTING
1- Problem: ProTune II is not communicating with the VFI module.
a- Check that the VFI module is powered. The VFI module must be supplied with vehicle power in order to operate. Your motorcycle ignition
and run/stop switch should be set to the ON and RUN positions. Make sure that the battery voltage is normal. Try cycling power to the VFI
module (switch off the ignition for 15 seconds and then switch on).
b- Check that the cable is connected firmly to the VFI module and the PC.
c- Try disconnecting and reconnecting the USB connection to the VFI module. This will reset the module connection and allow Windows to
relocate the device.
d- Was the USB driver installed correctly? Please review the Installing USB Drivers section of this instruction sheet. Additional troubleshooting
information can be found in the ProTune II Manual installed with the software on your PC.
2- Problem: I have the correct calibration loaded into the VFI module for my motorcycle, but it won’t start or idle properly.
a- If the motorcycle has a stock throttle body, please review the Stock Throttle Body Setup Procedure section in this instruction sheet.
b- If the motorcycle has an S&S or other aftermarket throttle body, please review setup instructions for those components. Typical S&S
throttle body closed throttle voltage setting is 0.50 V. Variation of +/- 0.02 V is typical.
c- Perform Test Outputs function using the ProTune II software (see ProTune II manual or help files installed with the software for additional
information). Specifically, check to ensure that both injectors and ignition coils are working correctly and installed on the correct cylinder.
Also verify that the stepper motor (Idle Air Control) is functioning properly.
d- Verify that the VFI module is powering down properly. When the VFI module is powering down (ignition on then off) the stepper motor will
move through a recalibration process and the VFI module will remain in communication with the ProTune II software for approximately 10
– 15 seconds after the ignition switch is turned off. If this does not happen, verify components and wiring for the constant or ECM power
system of the motorcycle.
e- If performing the above tasks does not correct the problem, please contact S&S Tech Services. Be prepared to list details about your
motorcycle and engine configuration. Model year, displacement, compression ratio, camshaft, intake, and exhaust are typical items needed
to determine if the calibration is correct. Also, be prepared to provide the part number or details about the calibration you are using. This
information can be found in the Comment Field portion of the calibration. This is accessed through the View menu of ProTune II. You may
also be asked to send your current calibration to S&S via e-mail.
PROTUNE II DIAGNOSTICS
The recommended method for checking the VFI module for Diagnostic Trouble Codes (DTCs) is by using the ProTune II software. DTCs can be read
and cleared by clicking on the DTCs button found on the upper left of the ProTune II screen when connected to a powered module.
Please, refer to the ProTune II manual or help files for more information on DTCs.
CHECK ENGINE LAMP DIAGNOSTICS
NOTE: The VFI module has a feature where the check engine lamp can be used as a shift light. If your VFI module is configured in this manner, the check
engine lamp diagnostics function will be disabled.
The procedures to activate and read the check engine lamp are as follows:
1- Turn the ignition switch to the ON position for three seconds (one second pause after the fuel pump stops), and then switch back to the OFF
position for three seconds. Repeat this procedure one more time and then turn the ignition to the ON position and wait for eight seconds for
the check engine lamp to start flashing.
2- The transmission of a code is always preceded by a series of rapid flashes (about 3 per second). This “intermission” is followed by a 2 second
pause in which the lamp is off. The lamp will then flash one or more times to indicate the first digit of the trouble code. The length of time
the lamp is illuminated and the length of time in which it is off are each about 1 second in duration. The number of times the lamp flashes
indicated the first digit of the trouble code.
3- Following the transmission of the first digit, there is another 2 second pause in which the lamp is off. The lamp will then flash one or more times
to indicate the second digit of the trouble code. The number of times the lamp flashes indicates the second digit of the trouble code.
4- Following the transmission of the second digit, there is a third 2 second pause in which the lamp is off. After the pause comes an “intermission”,
followed by transmission of the next recorded trouble code. All subsequent codes are sent in the same manner, each separated from the
next by an “intermission”. Once all the trouble codes have been sent the data string is repeated. See Table 1 for a list of the trouble codes
supported.
5- Turn the Ignition Key switch to OFF. Wait 10 seconds for the ECU relay to click. The vehicle can now be started normally.