Support Center

Getting Started with OBD Fusion®

Last Updated: Dec 21, 2017 02:19PM EST


This article will serve as a primer for some of the most common functions within the OBD Fusion app including how to connect to your OBD2 adapter and vehicle, update your vehicle settings, use the dashboards, read and clear trouble codes, and use data logging.

Initial Setup

After opening the app, go to Settings > Connection Help for instructions on how to connect to your OBD2 adapter. The connection help contains instructions for connecting to the supported communication types for OBD Fusion.

Connection Help iPhone 7  Connection Help Nexus 5x

After connecting for the first time, a dialog is displayed for setting up the vehicle settings as shown below. In order to get the most accurate fuel economy, power, and torque estimates, it is important to setup your vehicle information in Settings > Vehicle Editor.

Edit Vehicle Dialog iPhone 7  Edit Vehicle Nexus 5x

Vehicle Editor Settings

The vehicle year, make, model, and option should be set up using the 'Select' buttons if possible. Please note that even if your vehicle is not listed, you can manually enter your vehicle information into the text fields available within the vehicle editor. This will not affect the features that are available within the app.

Fuel Economy

Some settings within the vehicle editor can affect the accuracy of the fuel economy calculations. OBD Fusion selects the most accurate method for the fuel economy calculation based on the PIDs that are supported by your vehicle. Please see the list below for required items to setup for each of the fuel calculation methods. It is also recommended to setup all other fields in the vehicle editor.

  • Mass air flow rate
    • Fuel Type
  • Intake manifold absolute pressure
    • Fuel Type
    • Engine Size: refer to your owner's manual for this information.
    • Volumetric Efficiency: the information button found to the right of this field provides guidance for typically values for VE for different engine types. It may be possible to find additional information for your vehicle online.
  • Direct Fuel Rate
    • No vehicle editor settings are required.
Power and Torque Settings

The power and torque calculations require that the fuel economy settings are configured as outlined above. Additionally, the Brake Specific Fuel Consumption field should also be configured. The information button found to the right of this field provides guidance on common ranges for different engine types. It may be possible to find additional information for your vehicle online.


To use the dashboards, tap on the 'Dashboard' icon from the main screen of the app.


Dashboard iPhone 7  Dashboard Nexus 5x
Modifying Existing Gauges

To modify the configuration for an existing gauge, press and hold the gauge until the configuration menu is displayed.

Dashboard Configuration Menu iPhone 7  Dashboard Gauge Configuration Menu Nexus 5x
  • Size and Location: manually adjust the size and location of the gauge. Note that the values used here are based on percentages of the dashboard size. Currently, the gauges must be square and the lesser of the width and height dimensions is used.
  • Display Configuration: update the displayed title and PID, number of decimals used for the value displayed, and min/max values for the range (radial gauges only).
  • Style: update the color, label size and location, bevel properties, and other style related characteristics of a gauge. Note that the style for a gauge can be stored and reused from the 'Menu' option in the top right corner of the style editor.
  • Change Display Type: select between a radial and digital gauge.
  • Bring to Front: if a gauge overlaps another gauge, this can be used to adjust the Z-order to bring this gauge to the front.
  • Send to Back: if a gauge overlaps another gauge, this can be used to adjust the Z-order to send this gauge behind.
  • Remove Display: removes the display from the dashboard.
  • Drag and Move: visually adjust the position of the gauge within the dashboard.
  • Reset Min/Max (radial gauges only): reset the minimum and maximum indicator values displayed on the gauge.
Modifying a Dashboard

To open the dashboard configuration menu, tap the 'Menu' button on iOS or the overflow menu on Android from the dashboard page.

Dashboard Configuration Menu iPhone 7  Dashboard Menu Nexus 5x
  • Add Display: adds a new gauge to the current dashboard page.
  • Add Dashboard: adds an empty dashboard page to the list of dashboard pages.
  • Remove Dashboard: removes the current dashboard page from the list of dashboard pages.
  • Dashboard Settings: updates the dashboard background color.
  • Load Default Dashboards: replaces the existing dashboard set with the default dashboards.
  • Toggle HUD Mode: enables your device to be the used as a heads up display by mirroring the screen.
  • Calibrate Device Sensors: compensates device roll, pitch, and yaw for the current device position.

Trouble Codes

Read Trouble Codes

To read trouble codes, tap the Diagnostics icon on the main screen of the app. Codes can be refreshed by tapping the menu icon and 'Refresh'. Please note that you should only read codes with the key in the on position and the engine off. After querying the vehicle, any trouble codes detected will be displayed as shown below.

Trouble Codes iPhone 7  Trouble Codes Nexus 5x
Clear Trouble Codes

To clear codes, tap the menu button and select the 'Clear Trouble Codes' option. Please note that you should only clear codes with the key in the on position and the engine off. Also, it is possible that a trouble code will not be cleared if the underlying problem that caused the code is not resolved. After clearing codes, you can re-read the codes by using the procedure outlined above.

Data Logging

For more information on setting up and using data logging, please see the Configuring Logging support article.

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