This is H-D tech bulletin on the issue:
TT380 - June 12, 2008 - High Idle Complaints on 2008 Touring Models
High Idle Complaints on 2008 Touring Models
Due to '08 Electronic Throttle Control
calibration strategy parameters and throttle gripsensor
variability some customers
have experienced intermittent changes in idle RPMs. This
condition is caused by a change in the zero position stored to memory in the ECM, as
determined by the last four readings seen at key OFF. This cannot increase engine speed
while riding but would change the idle RPM, similar to adjusting the throttle stop screwon a
To correct this condition we will be making several changes
to the throttle gripsensor to
reduce voltage variances and also update the way the calibration's strategy looks at and
records these voltages. Completion of these changes and test validation will take several
In the interim we have released revised calibrations in the latest version of Digital Tech
alleviate the high idle concerns for those customers experiencing the condition. The current
software version (1.004.001) and details of the changes can be viewed by selecting the
What's New button on the home screen of DTII. This info
is also on h-dnet under:
Service>Tools & Equipment Info>DTII>Version Updates-What's New. The new calibrations
will leave the ECM powered up for 10 seconds after key OFF to complete housekeeping,
allowing the rider more opportunity to release the throttle grip, so the throttle control can
return to true zero before the ECM power
is shutdown. This should eliminate rider induced
zeroing issues. Additionally, the new calibrations will be less sensitive to voltage changes due
to an increased dead-band in the operating strategy. Under certain conditions and riding
styles some customers may notice a slightly different throttle feel, or comment on reduced
engine responsiveness. This is due to the increased dead-band and will feel similar to a loose
throttle cableadjustment on non-ETC vehicles.
Therefore, we recommend only reflashing vehicles for customers experiencing the high idle
concern and wait for the next version calibrations before updating vehicles on a wider scale.
SE Race Tunerand SE Super Tunercalibrations have not been updated at this time, and
reflashing a stock cal over a Tuner cal may only temporarily alleviate the high idle, until you
reflash back to a tuner cal.
It is recommended anytime you replace ECM, TGS or Reflash the calibration to cycle the Ign.
switch 4times, waiting 10 full seconds after keying off between cycles, to relearn zero TGS
The following warranty credit procedures will apply to domestic dealers only:
Warranty credit will be allowed for reflashing the calibration at the usual rate.
For OE calibrations including CVO, file an MC claim using labor
code 7804 for 0.2 hours
For SWR'ed P&A calibrations, file a PNA claim using labor code 8209 for 0.2 hours labor.
Non-registered P&A performance calibrations will require preauthorization for warranty credit.
NOTE: Labor code 8209 is a new code and may need to be downloaded into your system