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I am trying to to write an app which advises the driver to change gears and do some other driving quality assessments. For this purpose I need to determine the RPM and currently active gear in a manual transmission vehicle. I am working on a Ford Fiesta 1.6 Petrol and reading the information from OBD2 using CAN and I can read the RPM but there is no standard PID for gear. Does anyone know how to determine the currently engaged gear for a MT vehicle from OBD2 at least for Ford Fiesta if not generally.

Also I wanted to know if I can use the engine load value (PID 4, Mode 1) to determine of the engine is going to stall?

Vajira Lasantha
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Mohammed Lokhandwala
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1 Answers1

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You can determine the gear by comparing the engine RPM and the vehicle speed. Most cars that have a shift light though do not actually know what gear they are in, they use engine RPM, engine load and throttle position.

A near stall could be determined by looking at engine load and RPM. Low RPM and high load will give it away.

vini_i
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