New for 2018!   Twin Scan 4

Twin Scan 3 can be upgraded, click here.



Twin Scan 4 CANBUS Scan Tool

· Compatible with 2011-2018 Softail®, 2012-2017 Dyna® and 2014+ Sportster® and 2014+ Touring models with CAN data bus (all models with a 6-pin diagnostics connector)*. 

· New software for 2018! Uses laptop PC for display. Includes software for Windows 7/8/10.

 · All of the same great features as Twin Scan 3:

· Reads and clears diagnostic trouble codes from engine control module (ECM), BCM (body control module), speedometer, and anti-skid braking system (ABS)

· Real time display of engine data on instrument panel type display

· Anti-skid brake system (ABS) brake bleeding functions.

· Built-in 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

· Includes two analog inputs with 0-20V or ±200V range. Dual channel scopemeter capability for waveform display. The analog inputs can also be used for air/fuel ratio (AFR).

· Compact size: 3.2"L x 2.2"W x 1.0"H


· All new features of the Twin Scan 4:

· KEYFOBS and SECURITY: Program and read key fobs, program PIN and disable security all together.

· ACTIVATE MODULES, LIGHTS, and INDICATORS: Test different actuators, lights and indicators and Fuel Pump Drain.

· SPEEDOMETER: Sweep test, tachometer sweep test, activate all dash indicators

· BODY CONTROL SETTINGS: Read settings in the BCM for ignition switch, radio installed, bank angle sensor for trike installs, fog light function, and ABS installation.

· UPDATES FOR LIFE: Latest software will include latest firmware for easy remote updating of the Twin Scan 4.



Twin Scan Complete Kit

· Includes both Twin Scan II ABS (for 2001-2014 models with J1850 data bus), Twin Scan 4 (for 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 4.  

· Ideal 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. 

· Twin Scan 4 software can 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

Visit the Twin Scan 4 Tech FAQ for more detailed information about engine tuning and diagnostics!


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.


Part Number Description Suggested Retail
Twin Scan 4 Low Cost Scan Tool (for 2011+ models with CAN data bus (6-pos DLC connector). Includes USB cable and software on CDROM)
No license, no recurring subscription fees, all future Twin Scan 4 updates are free.

15302 Twin Scan Probe Kit (for use with Twin Scan 4 scopemeter feature. Includes two insulation piercing probes and 12 volt power adapters for general purpose use) $94.00

15600 Twin Scan Complete Kit (includes both Twin Scan II ABS and Twin Scan 4 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) $1391.00

15304 Twin Scan WEGO Upgrade Kit (for customers with any Twin Scan II, 3 or 4 version. Includes 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) $439.00

Twin Scan 3 ABS Upgrade to Twin Scan 4. The unit must be sent to Daytona TwinTec for updating. Contact us at 386-304-0700 for details. $140.00

New 2011-2018 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. The Twin Scan 4 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.

The Twin Scan 4 features stand-alone data logging (no laptop PC attached). This feature provides diagnostic capabilities not found in any other available tools. The Twin Scan 4 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.

Download Twin Scan 4 Instructions


Twin Scan 4 Software

The Twin Scan 4 software has an easy to use menu system. All of the tasks are easy to find and select. The main menu will take the user to any of these several major functions: reading and clearing diagnostic trouble codes, displaying real time engine data, displaying logged data in chart format, program keyfob and security settings, analyze AFR data when used with optional WEGO IIID, oscilloscope display of signal waveforms using scopemeter, configuration settings for BCM, ECM & Speedometer, activate modules to test various engine actuators, bcm controlled lights, and speedometer cluster warning lights.

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 troubleshooting flowcharts.

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.



Diagnostic Trouble Code Display

ABS Brake Bleeding Functions

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. ABS brake bleeding should only be performed by a trained and experienced mechanic.


ABS Tools Display

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.


Real Time Engine Data Display

Data Logging

You can display data downloaded from the Twin Scan 4 (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. You have a range of capabilities for analyzing and printing the data. Data can also be saved to a file for future reference.


Data Logging Chart Display


AFR Data Analysis

The Twin Scan 4 Plus kit includes the WEGO IIID dual channel wide-band oxygen sensor system. When the WEGO IIID is connected, the Twin Scan 4 will log engine data along with the actual front and rear cylinder air/fuel ratio (AFR). The Twin Scan 4 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 4 software to an Excel spreadsheet and then copy and paste from the Excel spreadsheet into the engine mapping software. In the Twin Scan 4 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.


Scopemeter Feature

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 4 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 4 Tech FAQ for additional information.

Scopemeter Display of coil vs. crank pickup sensor waveform


Probe Kit for use on any motorcycle or vehicle


Key Fobs and Security Settings

The Twin Scan 4 is capable of reprogramming the wireless key fobs and the security PIN.  Also, the key fobs can be disabled to eliminate the need for the fobs.

Program Key Fobs and PIN 




The Twin Scan 4 software runs under Microsoft Windows XP/Vista/Win7/Win8/Win10. 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 4 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 4. For more detailed product information, we suggest that you download the Twin Scan 4 software and instructions. The software download includes sample files with actual data.

Download Twin Scan Software 



* Note: Not all features are available for all models. Most features are available for almost all models through 2016. For example, the 2017 and newer models have eliminated the adjustability of idle rpm and speedometer calibration for everyone at this time.


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Features Available now:

ECM BCM ABS SPD - Read Codes
ECM BCM ABS SPD - Clear Codes

ABS Brake Bleeding

ECM Real Time Data
ECM Datalogging
ECM AFR Table Analytics
ECM Activate Fuel Pump
ECM Perform Fuel Pump Drain
ECM Read Settings for ACR,EITMS,Cruise,Active Exhaust
ECM Read Current Idle Speed Setting

BCM Disable Security
BCM Enable Security 
BCM Program PIN
BCM Read Both Keyfobs
BCM Program Either Keyfob

BCM Head Light Test
BCM Brake Light Test
BCM Activate Left Turn Signal
BCM Activate Right Turn Signal

BCM Read Settings - Ignition Switch Enabled/Disabled
BCM Read Settings - Fog Light Enabled/Disabled
BCM Read Settings - Trike Bank Angle Sensor Enabled/Disabled
BCM Read Settings - ABS Installed/Not Installed
BCM Read Settings - Radio Installed/Not Installed

SPD Activate Dash Indicator - Neutral
SPD Activate Dash Indicator - Check Engine
SPD Activate Dash Indicator - Oil
SPD Activate Dash Indicator - Security
SPD Activate Dash Indicator - Water Temp
SPD Activate Dash Indicator - ABS
SPD Activate Dash Indicator - Low Fuel
SPD Activate Dash Indicator - Cruise Enable
SPD Activate Dash Indicator - Cruise Set
SPD Activate Dash Indicator - Battery
SPD Activate Dash Indicator - High Beam
SPD Activate Dash Indicator - Left Turn
SPD Activate Dash Indicator - Right Turn
SPD Speedometer Sweep Test
SPD Tachometer Sweep Test

Features Coming soon:

ECM Activate Left Fan
ECM Activate Right Fan
ECM Activate Coolant Pump
ECM Activate ETC Motor
ECM Activate IAC Motor
ECM ACR Enable/Disable
ECM Side Stand Enable/Disable
ECM Chassis Fan Enable/Disable
ECM Oil Fan Enable/Disable
ECM EITMS Enable/Disable
ECM Cruise Control Enable/Disable
ECM Active Intake Enable/Disable
ECM Active Exhaust Enable/Disable
ECM Clear Air Fuel Trims
ECM Engine Idle Speed 2014 to 2016 only.
ECM Calibrate Speedometer

BCM Installed/Not Installed - ABS
BCM Installed/Not Installed - Radio
BCM Installed/Not Installed - Ignition Switch
BCM Installed/Not Installed - Fog Light
BCM Installed/Not Installed - Trike
BCM Installed/Not Installed - Service Mode

SPD Pair Speedometer

All RADIO Settings

Rev Twin_Scan4.0.2 8/14/2018