Hondata

I've experienced a couple of issues when connecting a wideband PLX M to a P28 ECU with Hondata S300 installed.

- Connecting the wideband using the O2 sensor input gives the correct value for the voltage reading for the O2 sensor from 0 to 3.81volt. If the voltage is above 3.81, the O2 sensor value remains locked at 3.81v.
Is there a limitation in the span for this sensor input?

-Connecting the PLX M wideband to the D10-ELD input to, the ELD value in Smanager is higher than the actual output voltage from the wideband. This is du to the following. When the ELD input is not connected to any external sources, the voltage of the ELD input is about 4.8volt, which is also the value shown in SManager. If the wideband, with an output voltage of 2.35volt is connected to the ELD input, the result in SManager for the ELD input is 2.8-3.0volt.
Is there a pullup resistor in the ELD input circuit that is causing this?

If these are known issues, I'd apreciated some workarounds.

The O2 input is only for the narrowband input and is used for runing in closed loop from the PLX. There are no modification required to use the ELD input for datalogging wideband readings, but you cannot still have the ELD wire connected to the ELD. Please follow the instructions at: http://www.hondata.com/techplxwiring.html

Thanks for the reply.
The confusing part is that in the linked document "PLX Wideband Wiring Instructions" there are listed two methods of connecting the wideband O2 sensor. In method 2 the stock O2 input is used to connect the 0-5V input from the PLX.

Measuring 4.8V on the ELD input is done when the external wiring is disconnected, so that's why I am asking if there is any internal pull-up resistors in the ECU.
This is resulting in a higher voltage value on the ELD input than what is actually generated from the PLX wideband output.

In SManager under Parameters/Misc there is an option to Disable ELD. What is that function doing?

Disabling the ELD disables the error checking and resulting error code by cutting the wire to the ELD.