Twin Scan 3
Twin Scan 3 ABS Low Cost Scan Tool
with 2011-2017 Softail®, 2012-2017 Dyna®
and 2014+ Sportster®
and 2014+ Touring models
with CAN data bus
brake system (ABS) brake bleeding functions. For more information, refer to
the Twin Scan 3
laptop PC for display. Includes Windows software
and clears diagnostic trouble codes from engine control module (ECM), BCM
(body control module), speedometer, tach, and anti-skid braking
time display of engine data on instrument panel type display
data logging. Stores up to one hour of data. Automatically triggers when a
trouble code is set. Shows data before and after code is set
two analog inputs with 0-20V or ±200V range. Twin Scan 3
features two channel scopemeter capability for waveform display. The
analog inputs can also be used for air/fuel ratio (AFR). All Twin Scan 3 units can be
upgraded to Twin Scan 3 Plus for use as tuning aid
size: 3.2"L x 2.2"W x 1.0"H
Twin Scan 3 ABS Plus
Tuning Aid for Screamin Eagle®
Pro Super Tuner (SEST), Dynojet® Power Commander®, and Daytona Twin Tec Twin Tuner
IIID dual channel
wide-band oxygen sensor system for logging front and rear cylinder air/fuel
ratio (AFR) data along with engine data
Twin Scan 3 ABS Plus Kit
tuning aid for Screamin Eagle®
Pro Super Tuner (SEST), Dynojet®
Power Commander®, and Daytona Twin Tec Twin Tuner. Twin Scan software analyzes
logged data and displays AFR and the required volumetric efficiency (VE)
correction (in percent) with the same RPM rows and throttle position sensor (TPS)
or manifold pressure (MAP) columns used in these systems' tables.
directly copy and paste to an Excel spreadsheet that you can use to calculate
the required corrections and then copy and paste the data to the Pro Super Tuner
or Power Commander® software. You can also directly export calculated fuel correction data to Twin Tuner data files.
Twin Scan Complete Kit
both Twin Scan II ABS (for 2001-2014 models with J1850 data bus), Twin Scan 3
2011+ models with CAN data bus, 6-pos DLC connector), WEGO IIID for tuning capability with both
Twin Scan versions, and the Twin Scan 3 Probe Kit for use with the scopemeter
feature of the Twin Scan 3 ABS.
Twin Scan Complete Kit
Order online using Paypal or call us at 386-322-7390
(Monday-Friday 9 AM to 5 PM Eastern time) for credit card and COD
orders. For online orders, please email any
special instructions to
All products covered by our
1 year limited warranty.
Twin Scan 3 ABS Low Cost Scan Tool (for
models with CAN data bus (6-pos DLC connector). Includes USB cable and software on CDROM)
Twin Scan 3 ABS Plus WEGO Kit (includes Twin Scan 3 ABS, WEGO IIID Interface, two
Bosch LSU 4.2 wide-band oxygen sensors, two 18 x 1.5 mm weld nuts, two 18 x
1.5 mm hex socket plugs, USB cable, and software on CDROM)
Twin Scan 3 Probe Kit (for use with Twin Scan 3 scopemeter
feature. Includes two insulation piercing probes and 12 volt power adapters for
general purpose use)
Twin Scan Complete Kit (includes both Twin Scan II ABS and Twin Scan 3
ABS units, WEGO IIID Interface, two
Bosch LSU 4.2 wide-band oxygen sensors, two 18 x 1.5 mm weld nuts, two 18 x
1.5 mm hex socket plugs, USB cable, probe kit, and software on CDROM)
Twin Scan WEGO Upgrade Kit
(for customers with any Twin Scan II or 3
WEGO IIID Interface, two Bosch LSU 4.2 wide-band oxygen sensors, two 18 x
1.5 mm weld nuts, and two 18 x 1.5 mm hex socket plugs)
Twin Scan 3 Upgrade to Current Version (for customers with older Twin Scan 3
unit. Contact us at
386-304-0700 for pricing and details)
New 2011-2017 Harley-Davidson® motorcycles use the
CAN data bus for
communications between the engine control module (ECM), instrument module (IM),
body control module (BCM), anti-skid braking system (ABS) and diagnostic scan tools.
Twin Scan 3 ABS connects to the six terminal Deutsch style data link connector on
the H-D® wiring harness and requires
a laptop PC for user interface and data display. You can read and clear
diagnostic trouble codes from the ECM, BCM,
speedometer, tach, and ABS (if equipped). You can view real
time engine data on an instrument panel type display.
Twin Scan 3 ABS features stand-alone data logging (no laptop PC attached).
This feature provides diagnostic capabilities not found in any other available
tools. The Twin Scan 3 ABS is especially useful for diagnosing hard to find
intermittent trouble codes. The motorcycle can be operated while the unit is
installed. Under normal conditions (no trouble code), the unit can be set up to
store data for the last hour of operation. If a trouble code is set, the unit
automatically stops logging data 30 minutes after the code is set. Even days or
weeks later, you can download the data. You can examine in detail what happened
before and after the code was set. You
have a range of capabilities for analyzing and printing out logged
data that is displayed in a chart recorder format.
Twin Scan 3 ABS Instructions
Twin Scan 3 Software
Scan software has five major functions: reading and clearing diagnostic trouble
codes, displaying real time engine data, displaying logged data, scopemeter
display of signal waveforms, and analyzing
AFR data (if used with optional WEGO IIID).
Diagnostic Trouble Codes
The unit will
display information for all available modules (this includes the speedometer and
tach on models with the instrument module on the data bus and the ABS). The upper half of
the screen displays the system ID and calibration code information. The lower
half of the screen displays diagnostic trouble codes. Each current and historic
trouble code is displayed along with a brief description. The software includes
a database of all diagnostic trouble codes published by Harley-Davidson®.
You can then refer to the H-D®
Electrical Diagnostic Manual for your model for detailed explanations and
You can print the
displayed information to any Windows printer by clicking on the Print Codes
button. You can clear any codes by clicking on the Clear Codes button.
Trouble Code Display
ABS Brake Bleeding Functions
ABS brake bleeding
functions are only available on Twin Scan 3 ABS units with version 4.0 or
higher firmware that supports the special codes used for ABS brake bleeding. If
you attempt to use the ABS brake bleeding functions with older Twin Scan 3
units, an error message will be displayed. Older Twin Scan II units can be
bleeding should only be performed by a trained and experienced mechanic.
Individual front and rear ABS brake bleeding functions are available. If you
are only servicing the front or rear brake section, you do not need to bleed
the opposite section.
Real Time Engine Data
You can display real time engine data on an instrument panel type layout with
round tach and speedometer gauges and bar graph type gauges for most other
parameters. Barometric pressure, idle RPM and system status are displayed in
additional boxes. If the engine is not running, most values will appear as zero.
You can log data directly to the laptop PC while real time engine data display
is active by clicking on the Start Data Logging button. Data is logged to a
buffer memory on the laptop PC that stores one hour of data at 10 samples/second
(3600 samples). You can start and stop data logging
as desired. The last 3600 samples will remain in the program data buffer.
Time Engine Data Display
You can display data
downloaded from the Twin Scan 3 ABS (if the unit has been operated on the motorcycle
in stand-alone mode) or directly logged while real time display was active. The
logged data appears on a chart recorder type screen. The screen snapshot below
shows the complete set of parameters.
have a range of capabilities for analyzing and printing the data. Data can also
be saved to a file for future reference.
Logging Chart Display
AFR Data Analysis
Twin Scan 3 ABS Plus kit includes the
WEGO IIID dual channel wide-band oxygen sensor system.
When the WEGO IIID is connected, the Twin Scan 3 ABS will log engine data along with
the actual front and rear cylinder air/fuel ratio (AFR). The Twin Scan 3 ABS Plus is an
ideal tuning aid for use with the new Screamin Eagle®
Pro Super Tuner (SEST)
or Dynojet® Power Commander® on fuel injected motorcycles. The
figure below shows logged AFR
data that has been analyzed and displayed in Twin Cam format.
You can select from multiple formats so that AFR data is displayed with the same RPM rows and
throttle position sensor (TPS) or manifold pressure (MAP) columns used with most
engine mapping systems.
AFR Data Display
You can also
display and print out the required volumetric efficiency (VE) correction (in
percent) based on the AFR command. This gives you the required
fuel correction. You
can add data from an unlimited number of files that you previously saved. The
data will be analyzed and incorporated into the table. Cells that vary more
than ±0.5 AFR from the command value are shaded blue for rich or red for lean.
VE Percent Correction Display
You can use two approaches to make the
required corrections in third party engine mapping systems. If you have
Microsoft Office with Excel, you can directly copy and paste data from the Twin
Scan 3 software to an Excel spreadsheet and then copy and paste from the Excel
spreadsheet into the engine mapping software. In the Twin Scan 3 software, you
can select a range of cells with the mouse and right click to bring up a copy
menu. You can also left click on the upper left legend cell to select the entire
table and then right click to bring up the copy menu. For more details on using Excel,
including sample spreadsheets, please visit the Twin Scan 3 Tec FAQ.
Alternately, you can manually enter the required corrections in the engine
mapping software by referring to the printed VE percent correction table and
marking off cells as you edit them.
When used with the Daytona Twin Tec Twin Tuner, the program can directly export
VE correction data to Twin Tuner data files.
The unit includes a scopemeter feature
that allows display of two signal waveforms and is very useful for diagnostic
purposes, such as looking at coil and injector drive signals to determine why a
cylinder isn€™t firing.
Waveforms can be printed and saved to a file for future reference.
In scopemeter mode, the Twin Scan 3
ABS can be used on
earlier models and other makes of motorcycles. We offer a probe kit with
insulation piercing probes and power adapters for use on earlier models and
other makes. Refer to the
Probe Kit Instructions for details including
reference waveforms and diagnostic tips. Visit the
Twin Scan 3 Tech FAQ for
Coil and CKP Sensor Waveforms
The Twin Scan 3
software runs under
Microsoft Windows XP/Vista/7/8/10.
We no longer support
older Windows versions. Minimum PC requirement is a 300
MHz Pentium with super VGA display (SVGA with 1024 x 768 pixel resolution). The
Twin Scan 3 ABS connects to the PC by means of a USB interface. A USB cable is
supplied with the unit. The PC must have a free USB port. If you have an older
PC without USB capability, you cannot use the Twin Scan 3 ABS.
more detailed product
information, we suggest that you download the Twin Scan 3 software and
instructions. The software download includes sample files with actual data.
Twin Scan Software
The Twin Scan 3 ABS Plus kit can be used with an exhaust sniffer that allows temporary
installation on most motorcycles for tuning and diagnostic purposes.
offers an exhaust sniffer, P/N 777, suitable for use with the WEGO. For
additional information on do-it-yourself sniffers,
refer to our
Motorcycle Exhaust Sniffer Tech Note.
P/N 777 Exhaust Sniffer
All 2012 and later models are equipped with miniature 12mm oxygen sensors.
The Bosch LSU 4.2 wide-band oxygen sensors used with the Twin Scan 3 ABS Plus kit
are 18mm and will not fit. Smaller wide-band sensors are not available. However,
there is a solution. Several other companies sell an
oxygen sensor manifold kit that allows easy
installation of Bosch LSU 4.2 wide-band sensors on any exhaust system for
testing purposes. The
process involves drilling small holes and using a special tool to install
threaded fittings for the sensor manifolds. After testing, button head stainless
steel screws are installed in place of the sensor manifolds and the heat shields
Sensors Installed for Tuning Using the Kit
Example of a Manifold
Oxygen Sensor Installation Kit