Hondata

Yes, the OBDI ECU does not have a C connector, but the harness on the OBD2 car does.

So apparently the Honda drawing for the ECU does not label the pins the same way...

D10 on that link is D18 on the Honda drawing, so that's the mix-up I've been encountering!!!

Thank you da_dude!

My Tuning guy wants to tune my car in open loop only, and not use the factory O2sensor, my car is a 2000Civic SI OBD2B , and I have a brand new Hondata P28ECU with the OBD2B Connector built in, so I have to wire the wideband analog wire into factory O2 sensor wire in the wiring harness.....I am having difficulties figuring out what wire in my OBD2B harness to use as the ECU itself is an OBD1.....Any help???

The diagrams in our help file are correct as viewed from the terminal side of the plugs.

http://www.hondata.com/help/smanager/ecuconnectors.htm

OBD1 pinouts for the inputs and outputs can be found in the link above.

Ok so according to the OBD1 ECU connector diagram from the help section link you posted, pin D14 is the O2 input, but my harness is OBD2B, so I am having a hard time figuring out what wire on my harness male plug to wire my wideband analog input into...The factory OBD2B ECU has a blank D connector, but the new Hondata p28 ECU I bought with the built in OBD2B conversion has pins in the D Connector....

scroll down on that link

Its was C16- primary O2 sensor wire ( White ) on my OBD2B harness

i have my wideband on d10 ELD,
but my circuit stop working, same times works.... same time not.
looks like a condenser problem

can you tell me if theres a condenser on ELD circuit ? and which is ?

What do you mean by a condenser?

Spunkster wrote:What do you mean by a condenser?

Capacitor , sorry

There are only 2 resistors which should be removed.

i know , r136 and r138, i have this working for 2 years.

and now sometimes i have good/right/correct readings, and sometime not ... looks like a bad capacitor :(

You could try replacing all the electrolytic capacitors on the ECU: https://www.hondata.com/accessories/capacitor-kit

Spunkster wrote:You could try replacing all the electrolytic capacitors on the ECU: https://www.hondata.com/accessories/capacitor-kit

thanks a lot ,
I had already replaced. a year ago.

i will replace c18 again