gunhatch

I recently swaped a B18c into my 94 Civic CX. All the error codes are now gone except I still get the error Code 41 (O2 sensor). I'm using a 95 integra p72 ECU. I've replaced the O2 sensor with a BOSCH universal unit and have checked and re-checked many times all the wires from the O2 harness to the ECU. Here's how it's set-up:

From O2:bosch -- to Harness -- to ECU
Black -- white/red -- D14
Grey -- Green/blue -- D22
White -- orange/black -- A6
White -- Yellow/black -- A25

I've even tried switch the two white wire and still no luck. Please let me know what needs to be done to make the O2 work.

PhatBoy5015

Just get Hondata or E-manage and loop the O2 sensor.

gunhatch

Is there a way to make this work without buying another engine management unit?

gunhatch

Anyone else with this problem?

gunhatch

Can anyone help? It's a GSR Harness.

Jmunk

Make sure that the pinouts are correct. I did this same swap over a year ago and can't really remember the combination, but i found a good site on google with info. You have a signal wire, heater wire, ground and power I think. The power wire can go off of any yellow black i believe and the signal one goes to the original one wire and the ground goes back to the ecu i think also with the heater? Don't quote me.

gunhatch

Thanks. I double checkd the pinouts from the ECU and from the wire harness. They all seem to be correct. I even used a multimeter to varify that they go the the correct location. I used a USDM GSR harness, shouldn't everything just plug up? They seem to go to the correct wire location in the shock tower.

Jmunk

http://www.hondaforums.com/lof....html

MasterKwan

The two whites are the heater leads, there is no polarity so, the direction doesn't matter. Looks like they're hooked up right if you don't get a heater code. Make sure one wire's ground and the other 12 volts when the key's on.

How are you connecting the wires? Using the little insulated box Bosch provides? Soldering doesn't work on those wires. It looks like the only thing that could be wrong is you have, black and grey swapped of you're just not getting a good connection through the connector.

You can do this.

1) Disconnect the ECU from the harness.

2) Disconnect the O2 from the harness

3) Ohm from black to grey. (D22 and A25 on the ECU harness).

4) Use a paper clip to jumper black to gray (on O2 plug).

5) Ohm again.

You should see open and short for those two measurements. (infinite and zero). If you don't get 0 resistance when you jumper and measure, you know there's a break in the wiring, probably in that stupid Bosch waterproof connector.

Then do the same thing for the heater circuit.

Using that technique, it's easy to see of you have a bad connection to the O2 sensor.

gunhatch

Thanks. Well,.. I checked the wires and they look to be good.

Even though the O2 sensor is new, since it was a universal unit, I decided to check the resistance and found it out to be 3.6 ohms. What is a good GSR O2 sensor supposed to be between? The (bad) one I replaced was at 12.6 ohms. Isn't it supposd to be between 14-30 ohms? Has anyone been able to use a universal unit with a GSR ECU (95, incase the year matters)?

I am using a USDM GSR wire harness, I'm also asssuming that the harness does not need any modification to work, correct? Please let me know.