AEM FIC works in Yaris......Sort of

[bearda]

Originally Posted by CTScott

I just noticed this thanks to its bump. The primary 02 sensor is not a raw 0 to 1 volt output, like most 02 sensors (including the secondary on the Yaris). The primary output sits on a offset voltage from the ECM, so in order to tap into it your devices needs to be able to deal with the floated voltage and if your device uses the sensor data directly, and then fools the ECM with an output, its output needs to be able to deal with that offset.

Dumb question, but if you're just adding an offset voltage couldn't you wire in a regulator for the offset? If the output is something like 3-4 V, couldn't you just hook a regulated 3V source up in series with the FIC output to bring it up from 0-1 to 3-4?

[CTScott]

Originally Posted by bearda

Dumb question, but if you're just adding an offset voltage couldn't you wire in a regulator for the offset? If the output is something like 3-4 V, couldn't you just hook a regulated 3V source up in series with the FIC output to bring it up from 0-1 to 3-4?

The ECM is actually generating the offset voltage. If a FIC output gets connected in place of the OEM 02 sensor, then its output needs to be able to deal with the offset voltage.

Or, you could ignore the power pin going from the ECM to the sensor, feed the FIC output into a level shifter (using an op-amp) and into the ECM's input pin.

[CASTREX]

Update from Boomslang:

For the Yaris, we already have the connnectors and are waiting for the tooling. ETA Aug-17