Twin Scan II Low Cost Scan Tool

Compatible with 2001-2009 H-D^® fuel injected models using Delphi^® system (including V-Rod^®) and 2003-2006 carbureted models with new 12 pin ignition module
Support for new 2006-2009 closed loop fuel injection systems
Displays throttle position on new 2008-2009 touring models with electronic throttle control
Uses laptop PC for display. Includes Windows software
Reads and clears diagnostic trouble codes from ECU (engine control unit), TSSM (turn signal/security module), speedometer, and tach
Real-time display of engine data on instrument panel type display
Built-in data logging. Stores up to 45 minutes of data. Automatically triggers when a trouble code is set. Shows data before and after code is set
Includes two analog inputs for air/fuel ratio (AFR). All Twin Scan II units can be upgraded to Twin Scan II+ for use as tuning aid
Compact size: 3.1"L x 1.6"W x0.8"H

New Harley-Davidson^® motorcycles use the SAE J1850 data bus for communications between the engine control module (ECM), instrument module (IM), turn signal/security module (TSM/TSSM), and diagnostic scan tools. The Twin Scan II is a low cost scan tool that is compatible with 2001-2009 H-D^® fuel injected models using the Delphi^® fuel injection system (including V-Rod^®) and 2003-2006 carbureted models with new 12 pin ignition module. Please note that 1999-2003 carbureted Twin Cam 88^® models and all models with the earlier Marelli^® fuel injection lack the J1850 data bus and are not compatible with the Twin Scan 88.

The Twin Scan II connects to the four 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, TSM/TSSM, speedometer, and tach (on models with IM data bus). You can view real time engine data on an instrument panel type display.

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

The Twin Scan software has four major functions: reading and clearing diagnostic trouble codes, displaying real time engine data, displaying logged data, 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). 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.

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. The screen snapshoot below shows the parameters displayed for a 2006-2009 closed loop fuel injection system with exhaust gas oxygen sensors. A subset of these parameters is displayed for other engine systems.

2008-2009 touring models feature electronic throttle control. In order to test and tune these models, you need to know the position of the electronic throttle actuator. The Twin Scan II real time engine data display gives you this critical information (TPS% in the upper right corner of the screen).

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 1450 data points using data logging interval ranging from 0.25 to 2.0 seconds. You can start and stop data logging as desired. The last 1450 data points will remain in the program data buffer.

Data Logging

You can display data downloaded from the Twin Scan II (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. Depending on the actual engine control system, a subset of these parameters is displayed. You have a range of capabilities for analyzing and printing the data. Data can also be saved to a file for future reference.

The Twin Scan II software runs under Microsoft Windows 98/ME/XP/Vista. Minimum PC requirement is a 300 MHz Pentium with super VGA display (SVGA with 1024 x 768 pixel resolution). The Twin Scan II 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 II. For more detailed product information, we suggest that you download the Twin Scan software and instructions. The software download includes sample files with actual data.