Short Term Fuel Trim normally runs between -10.0% and 10.0%, and Long Term Fuel Trim levels typically run between -5.0% and 5.0%. The Long Term Fuel Trim is made up of accumulated data from Short Term Fuel Trim readings and stored as historical data for the ECM to quickly pull from. The role of the ECM is to ensure your vehicle operates at optimal performance by managing the air-fuel mixture, regulating the emission control systems, and more.Ī positive reading of 0.0% or above means more fuel is being added to the air-fuel mixture to compensate for a lean condition, while a negative reading (<0.0%) indicates that the ECU is taking away fuel from the mixture to compensate for a rich condition.įuel trims are often displayed as Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Regardless of what data you can view on your make and model, here’s a high-level breakdown of what to look for with the most common OBD2 live data readings:įuel Trims: Short Term Fuel Trim (STFT) and Long Term Fuel Trimįuel trims are important when it comes to understanding how the ECU ( engine control unit) or ECM ( engine control module ) is controlling fuel delivery to the engine. But for you, this list might look much different.
#How to use obd2 reader how to#
Long Term Secondary Oxygen Sensor Trim Bank 2Įngine Reference Torque How to Read and Interpret Live Sensor DataĪs you can see with the Kia example, FIXD shows a wide range of live sensor data. Short Term Secondary Oxygen Sensor Trim Bank 2 Long Term Secondary Oxygen Sensor Trim Bank 1
Short Term Secondary Oxygen Sensor Trim Bank 1 Below Is the List of Live Data Feeds Allowed Through the FIXD App As Read From A Kia Telluride SUV In the vehicle I used for this article (a Kia Telluride), the sensor was able to read almost four dozen parameters from the Engine Control Module, which were then shown in real time (up to four at a time) on my smartphone. How to View Your Car’s Live Data with FIXDĪll gasoline-powered cars, trucks, SUVs and vans built after 1996 have an OBD2 port (diesel trucks, 2008 and newer), but the parameters that are available in the FIXD scanner live data display will vary by the year, make and model of your vehicle.
#How to use obd2 reader code#
In this scenario, the check engine light could be cleared, and then the live data would show exactly what conditions are present for the light to come back on as indicated by the amount of run time, distance traveled, and the number of warm-ups that have occurred since the code was cleared.Īlso, if the diagnostic trouble code indicates a faulty sensor, double checking the live data could verify the part is actually bad (and not another condition such as bad wiring) before spending the money on a new sensor. Even for a seasoned mechanic, this can be extremely frustrating, but having the ability to view live OBD2 data through the FIXD scanner can make the job a little easier. This includes anything from air and fuel mixture, emissions, engine speed, and more.Ī good example of when viewing live OBD2 data would be most helpful is in the case of a check engine light that comes on intermittently. Information from this data can then help DIY mechanics narrow down the origin of a certain problem by revealing what parts may be faulty or confirm the proper operation and continue diagnosis. The real advantage of viewing live sensor data is seeing how the engine and its computerized systems are behaving in real time. That’s where OBD2 live data readouts come in handy. On top of that, some powertrain and driveability issues won’t always result in a check engine light. A check engine light can be triggered by a number of different components from a faulty sensor to bad wiring, so before you go junkyarding to throw a new part on your car, you should slow down and attempt to properly diagnose the root cause. Simply knowing the diagnostic trouble code that caused a malfunction indicator light to come on isn’t always enough to repair the condition. That’s where the FIXD scanner and app comes into play offering the ability to not only read and clear any diagnostic trouble codes but also show live data to make repairing modern vehicles much more possible for DIY mechanics.
All of these sensors and computers are able to display live data in real time to provide easier diagnostics, but you need to have the right scan tool in order to do so.
#How to use obd2 reader driver#
A problem in any system is quickly relayed to the driver through a check engine light, and the use of an OBD2 scan tool helps show what area of the vehicle is experiencing a fault. Today’s automobiles are filled with advanced technologies controlled by various computer systems, and each computer operates through numerous sensors. Using the live data function of the FIXD scanner and app allows you to literally talk to your car when diagnosing most check engine light problems.
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