Gauges & Dashboards

Mobile phone showing vehicle data via OBD-II

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Friday, June 11th, 2010 Gauges & Dashboards Comments Off

OBD-II PIDs

P-codes, or OBD-II PIDs On Board Diagnostics “Parameter IDs”, are codes used to request data from a vehicle, used as a diagnostic tool. These codes are part of SAE standard J/1979, required to be implemented in all cars sold in North America since 1996.

Typically, an automotive technician will use PIDs with a scan tool connected to the vehicle’s OBD-II connector.

  • The technician enters the PID
  • The scan tool sends to the vehicle’s bus (CAN, VPW, PWM, ISO, KWP. After 2008, CAN only)
  • A device on the bus recognizes the PID as one it is responsible for, and reports the value for that PID to the bus
  • The scan tool reads the response, and shows it to the technician

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Friday, June 11th, 2010 Gauges & Dashboards 3 Comments

Interpreting Generic OBD-II Scan Data

Readily available ‘generic’ scan data provides an excellent foundation for OBD II diagnostics. Recent enhancements have increased the value of this information when servicing newer vehicles

If you don’t have a good starting point, driveability diagnostics can be a frustrating experience. One of the best places to start is with a scan tool. The question asked by many is, “Which scan tool should I use?” In a perfect world with unlimited resources, the first choice would probably be the factory scan tool. › Continue reading

Friday, June 11th, 2010 Gauges & Dashboards 2 Comments

About PID Calculated Load Value

There are two types of LOAD specified inĀ  SAE J1979

One is CALCULATED LOAD VALUE and the other is ABSOLUTE LOAD VALUE.

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Friday, June 11th, 2010 Gauges & Dashboards 11 Comments

Fraunhofer's 3D dashboard prototype

of companies are willing to throw at your car’s dashboard is amazing (well, maybe not your car — after all, you’re still driving a ’76 Gremlin). Taking things up a notch, the folks at have developed a dash that displays your location and the surrounding area in 3D, in real time. The system uses cameras to keep track of the location of your eyes, so the depth imaging effect can be achieved without using those funny glasses. In addition to the GPS, the dashboard only displays the information that is most relevant to the driver at any time — fuel gauge, tire pressure, route information or the title of the song can be displayed, depending on user preferences. It’s only a prototype at this point — be sure to check it out when you hit CeBIT in Hanover this March.

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Friday, June 11th, 2010 Gauges & Dashboards Comments Off

DIY a virtual dashboard with a tablet PC

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pgt;Several months ago I started to learn OBD-II programming and wrote a small utility to retrieve live data from my Scirocco’s OBD-II port. Since then I’ve improved my utility and made a graphic virtual dashboard on a tablet PC. Here is the video shot as a demo. The displayed data includes speed, RPM, engine load and throttle position. Of course a lot more data can be retrieved through OBD-II port and I planned to make several multiple screens showing different combinations of data to the virtual dashboard. Also I planned to add data logging and drag testing features.

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Friday, June 11th, 2010 Gauges & Dashboards Comments Off

Mass air flow estimation based on manifold absolute pressure

FIELD OF THE INVENTION

The present invention relates to estimating mass air flow through a throttle of a vehicle, and more particularly to estimating mass air flow based on manifold absolute pressure.

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Friday, June 11th, 2010 Gauges & Dashboards 4 Comments