Arduino to read OBD2 short and long term trims

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Oct 17, 2011 | 06:27 PM

JasonC SBB

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Arduino to read OBD2 short and long term trims

http://www.arduino.cc/cgi-bin/yabb2/...num=1291833804

Read OBD2 short and long term fuel trims.
Output synthesized O2 sensor signal to keep the factory ECU happy in piggyback system.
Profit.

Oct 17, 2011 | 06:28 PM

Joe Perez

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Quote:

Originally Posted by JasonC SBB

Output synthesized O2 sensor signal to keep the factory ECU happy in piggyback system.

Very cool.

I wonder how long until they get a letter in the mail from the EPA and/or CARB?

Oct 17, 2011 | 06:49 PM

JasonC SBB

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"They" is just one dude who made an OBD2 reader.

Oct 17, 2011 | 08:42 PM

y8s

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it plugs into the OBDII port?

if so, then it's almost worthless. you have to unplug it to test the car... and it wont have an input anymore.

Oct 18, 2011 | 11:16 PM

JasonC SBB

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If you unplug it then your ECU will default to assuming the long term trim is zero. It will take longer than a smog test to make long term trim drift into the throw-a-CEL range.