Does the Greddy EU read stock front O2 voltage?

*TDotMax* · 10-08-2009, 06:58 AM

As the title states. Do to recently buying a house and getting others mods comleted, I don't think I'll be able to hit the dyno for a true tune before winter.

With that being said I'm looking to trouble shoot my P0172, P0175 codes. First I'd like to ensure the voltage is correct on these. I just replaced them 2 years ago and would prefer not having to change $100+ sensors again.

MoncefA33 · 10-08-2009, 11:00 AM

The only way you can read O2 sensor voltage is with an OBD2 scanner I believe. The EU cannot read those voltages because there's no signal wiring for O2 sensors on the EU harness.

*TDotMax* · 10-08-2009, 11:55 AM

Makes sense. Might invest in an Auto Enginuity for these issues. Great program to have put a bit pricey considering my mech pulls codes for free but his doesn't do voltage.

*DandyMax* · 10-09-2009, 09:40 AM

Tap the voltage line from the sensor(s) and bring it in on the analog input, then you'll be able to track the waveform on the EU datalogger. Under closed loop conditions you should see it cycling back and forth from somewhere in the 0-0.5V range to back up to in the range of 0.5-1V, back and forth it cycles on either side of that 0.5V point. Check the FSM for an idea of how often (depends on rpm) but the faster you see it respond the better the sensor health.