The Top DSM Community on the Web

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. Log in to remove most ads.

Please Support STM Tuned
Please Support STM Tuned

Making your own rear o2 bypass/simulator

This site may earn a commission from merchant
affiliate links, including eBay, Amazon, and others.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Similar to vfaq's tutorial I will show you how to create a rear o2 bypass/simulator using parts available from your local radio shack.

Parts needed:
1 - Mohm resistor
3 - 50ohm/10watt resistors
1 - 1µF capacitor

(It is possible to use other variations than the 50ohm/10watt resistors I have chosen, like I said this is what was available. Myself and others have proven that they work perfectly fine)


I began by gathering all the parts required and I personally purchased a cheap aluminum box to contain everything once finished. To establish the best connection I would highly recommend soldering each connection. (also available at radio shack)

You must be logged in to view this image or video.


You must be logged in to view this image or video.


One option would be to remove the entire sensor and line from the vehicle and attach it to the existing wires. I decided I was going to just splice it underneath the vehicle. I didnt have much wire to choose from at home so I simply used some thick stranded wire I found and cut out points on it as shown below.

You must be logged in to view this image or video.


The layout, (the colors are accurate/same wire colors on the sensor)

You must be logged in to view this image or video.


I set all the parts in order for them to be soldered to the wiring.

Edit: I was notified that I had switched the resistor and capacitor around from my diagram. I didn't even realize that. Not a problem though, they are in parallel so either way works.
You must be logged in to view this image or video.


Then soldered everything together

You must be logged in to view this image or video.


Next I taped everything up and played with the aluminum box in my vise and created a smaller mountable enclosure.

You must be logged in to view this image or video.


Placed everything inside

You must be logged in to view this image or video.


And that's it! Just splice the corresponding wires to the o2 wires. Obviously I did a little extra than necessary and took some different steps but those are the basics

You must be logged in to view this image or video.


You must be logged in to view this image or video.


*It has been brought to my attention that some have said that the 3 50ohm resistors are not enough, I personally have never had a problem but being the case there is no harm in adding a 4th resistor.
 
Last edited by a moderator:
~ For safety issues I would highly recommend placing this outside the vehicle.
~ Be sure to check on it a couple times even after the light is cleared just to make sure its working fine and doesnt get too hot
~ If your nervous about hooking it up wrong- if worse comes to worse ive been told a resistor will simply melt or a a part will just fizz out and disconnect. Its no biggie, especially with the entire thing being <$7
 
Support Vendors who Support the DSM Community
Boosted Fabrication ECM Tuning ExtremePSI Fuel Injector Clinic Innovation Products Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications MyMitsubishiStore.com RixRacing RockAuto RTM Racing STM Tuned

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top