S&S Cycle Ignition System For All 1999–03 Carbureted Harley-Davidson Twin Cam 88 Engines - Manual (Page 9)

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NOTES: If the motorcycle has a check engine light, this can be used to read stored codes. For motorcycles without an OEM check engine light, there is an
LED on the face of the ignition module that functions as a check engine light, and can also be used to read stored codes.
Trouble codes are stored in memory for as long as the fault exists, and for 50 on/off cycles of the key after a fault is corrected. The S&S IST Guardian™
Diagnostic System (P/N 55-5075) has code clearing capability, and is a way to clear trouble codes immediately after a fault has been corrected. If a fault still
exists, a new trouble code will be generated.
Before purchasing the S&S IST Guardian™ Diagnostic System (P/N 55-5075) note that the software is only compatible with Windows® 2000/XP/Vista/7 32-bit
systems. It will not work on 64-bit operating systems.
Also, be aware that the Guardian system is only compatible with the S&S IST ignition module. It will not work with stock Harley-Davidson® or other
aftermarket modules.
1. Overview of check engine light operation.
Initial power on sequence.
The check engine light will flash in one of the three ways listed below each time the key is turned “on”, and the off/run switch is set to “run”
• If no faults are detected, the IST ignition will turn the check engine light “on” for 4 seconds, then “off”.
• If a fault is present at that time, the check engine light will turn “on” for four seconds, then turn “off” for four seconds, then turn “on”
continuously.
• If a fault has occurred and been corrected within the past 50 key on/off cycles, the check engine light will turn “on” for four seconds, then
“off” for four seconds, then “on” for eight seconds, then off.
When a current fault is detected, a code is stored in memory, and the check engine light comes on continuously.
2. Retrieving and displaying codes using the Check Engine light.
a. Turn key and off/run switch to “off”
b. Remove seat or side cover to expose the OEM datalink connector, located near the ignition module. See Picture 11, next page.
c. Remove rubber plug from OEM datalink connector.
d. Connect pins “1” and “2” of the datalink connector with a jumper wire. Pins have to remain jumped together during the code retrieval
process.
See Picture 12, next page, for pin locations. Do not connect any other pins except pins 1 & 2.
e. Turn key to “on” and set off/run switch to run, but do not start engine.
f. The check engine light will flash through its initial start sequence, as described above.
g. After the initial sequence of flashes, stored trouble codes will then be sent out as a series of flashes. Trouble codes are stored as two digit
numbers. The first digit of the trouble code is equal to the number of times the light flashes. There is then a 1.2 second pause, then the
second digit of the trouble code is flashed, again equal to the number of times the light flashes. After three seconds, if additional codes
are stored, they will flash in the same manner, until all codes have been displayed, then the sequence will repeat continuously. If only one
code is stored, it will repeat continuously.
Example: After flashing the initial start sequence (as described above) there will be a pause, then flash, flash, flash, flash, (1.2 second pause) flash.
(3 second pause) then the sequence repeats. This indicates code 41, meaning there is a problem with the crank position sensor.
NOTE: See chart on page 11 for definitions of fault codes supported by the S&S® ignition module.
h. After retrieving codes, turn ignition key and run switch to “off"
i. Remove jumper wire and replace datalink connector plug.
3. Retrieving codes using the S&S IST Guardian™ Diagnostic System (P/N 55-5075)
The Guardian system offers a more detailed decsription of the trouble codes than the Flash Code method. It also offers a way for trouble
codes to be cleared immediately after a fault has been corrected rather than the 50 on/off cycles if the key that are normally required.
CAUTION