DIY-WB
DIY-WB is a build-it-yourself wide band O2 sensor. Schematics are included. Conditions for usage:

Here is a working version of a DIY Wide Band O2 sensor. In its current
configuration it can only be used with a DVM or similar high impedance device.
The information supplied is *as is*, it's free, and the user assumes all risk
for its, assembly, use, care, and damage possibly caused by its use.

As with all non-professional electrical items there is no guarantee of final
accuracy or continued accuracy. It is not intended to be a laboratory grade
instrument. It's for the private use of those wanting to have more technology
available, and to experiment with such technology. It is in the truest form,
for educational purposes. It is not intended for commercial use, or to be in
any manner related to a profit organization or individual.

By downloading the following information you will be agreeing that it is for
your own personal non profit use. You also, are agreeing that any improvements
made to it by yourself or others will be publicly shared with the GMECM list.
While this is an analog version, an improvement to digital based on this art
will be consider a modification, and hence shared with the gmecm list.
Downloading this info, any using any of this art (or strategies) for use on
other type ion pump type is considered a modification of this design. Enhancing
its design and or abilities, i.e. interfaces to the gmecm, human monitoring (of
any form), and sharing that with this list would be considered at least good
form. If you are an electronics professional then you will be expected to note
any faults and publicly post them to the GMECM list. If you have any related
information to enhance its design (or understand the strategies involved) then
you are agreeing to relay that information to the GMECM list.

Bottom line, we're taking you at your word. The intent of this effort was for
educational purpose related to the GMECM list and DIY_EFI list. We've planted a
seed, and just hope it will grow.

A typical OEM switching type O2 sensor will not work with this project. This
project requires a 2 cell wide band O2 sensor that was used on a lean burn
Honda Civic. It is available from Honda dealers, and from www.hparts.com.

Application/part number:
92-95
Honda Civic
1.5 VTEC
36531-P07-003

The generic NAPA equivalent may be cheaper, but may not be widely available:
Part number OS791

The thread on this sensor is 18 mm x 1.5 mm pitch.

Mating connectors can be found on Civics and probably other Hondas, even if
they weren't lean burn. Try looking at:

the headlight harness,
near the brake master cylinder/booster (yellow wires with different color traces),
on the passenger side fender near the firewall,
90 accord distributor connector

The original manufacturer of the connector is Sumitomo. This connector
is from the HW Sealed Series 090


Thanks, Bruce

If you totally agree with the above then feel free to look at the following.


--------------------------------------------------------------------------------
The original design is available here.
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An updated and improved design, has been made available:
Assembly guide for the improved design
Usage conditions
Readme file
Original parts list
Construction notes
Parts list w/Digikey part numbers -- text
Parts list w/Digikey part numbers -- excel
Chip selection notes
Output voltage/AFR reference
Schematic -- heater control
Schematic -- O2 sensor interface part 1
Schematic -- O2 sensor interface part 2
picture of assembled circuit
picture of the Honda/NTK sensor
data sheet for O2 sensor (PDF)
.zip file of everything

Originally posted by Node
no matter how many times i see your sig gotboostd7, its still just as great as the first time :-D

Dear enthusiast,

Please read all of this email, and if we recently sent you one like it, then please ignore it.

You recently put your name on our "You Want It When" page to be informed of when we will accept more orders for built units.

We are ready, right now! Just follow this link below ...

http://techedge.com.au/vehicle/wbo2/builtwb.htm

and then follow the "order it here" links to complete your order.

At present we have just a couple of outstanding orders from people who are still organising their payment, but this can change rapidly so make sure you order sooner than later if you're interested in getting your built unit.

And yes, as I write this, the L1H1 sensor you need is not readily obtainable, but this has happened in the past, and the usual suppliers will eventually have them in stock again (only the NTK L1H1 sensor will work - don't ask about substitutes - they don't exist).

Also, please be aware that we will be offering a new model that will operate down to 11.0 volts (the current unit requires 13.2) and it will also have an optional RPM input for better logging options.

This new unit will not be available in built form for at least 4 to 6 weeks, so if you are after a unit that has been field tested over the last 12 months, then the current (and cheaper) unit is the one to get.

Peter.

--
Tech Edge Pty. Ltd. http://techedge.com.au
(02) 6251 5519 Int'l +612 6251 5519
37 Jalanga Cres. PO Box 288,
Aranda, ACT 2614 Jamison Centre, ACT 2614

Obtaining the correct NTK Sensor
The single most expensive and vital component of the DIY-WB kit is the NTK wide band sensor (also called a UEGO, or Universal Exhaust Gas Oxygen sensor).

The DIY-WB kit works ONLY with a specific 5 wire NTK sensor (with a 7 pin plug). This sensor is available as a replacement part for a Honda (part # 36531-P07-003 - Honda Civic 1.5 3 Door, circa 1995, US, non-Californian model).

The NTK sensor is stamped with the text L1H1 and is often referred to using this name. Any other sensor will not work and may damage your DIY-WB circuit.

The correct NTK sensor is available from, Motec for their own wide band meter, but it's also available at a much lower price from a number of web based discount trading stores.

Here's some more information on the NTK sensor and the sensor's Sumitomo connector we have collected.

Here are some suppliers we're aware of that sell the L1H1 NTK sensor:



The Parts Bin, or go to their catalogue entry - C5010-75044
NAPA Online, or go to their catalogue entry - ECHOS791
I'm working with Petro-Ject to get the correct oxygen sensor.