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Finally eliminating the CEL with EGR bypass for 4th gens

 
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Old 10-17-2010, 01:31 AM
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Finally eliminating the CEL with EGR bypass for 4th gens

to my knowledge no one has found a way to get the check engine light to stay off after removing the egr system. the solution people have been using is removing the valve, inserting a block off plate, and bolting the valve over the top of the plate then plugging it back in. leaving all the vac lines, control solenoid, and valves. isnt one of the biggest motives to do the egr bypass to remove all that extra junk? well you cant remove it all without geting a CEL.

over the last few days i've been looking over the ecu wiring diagrams and checking the resistance values of the valve and designing a circuit that will emulate the valve and trick the ecu. tonight i had a breakthrough!

basically i checked the highest and lowest resistance of the valve. the lowest ~4.20kohms and the highest is ~420kohms. i assumed (hoped) that the ecu isnt constantly checking the resistance from the valve, that its simply looking for an open or closed value at the appropriate times. so im using the wire that the ecu uses to tell the egr solenoid to open to control a SPDT relay. 30 on the relay is a 12v input, 87a outputs to a 420kohm resistor and 87 outputs to a 4.20kohm resistor. both outputs come together and connect to the wire the ecu uses to check the value of the egr valve.

partial breakthrough! because im using a relay i can hear when the ecu tires to open the solenoid, the problem is it opens and closes that solenoid rapidly which caused the relay to click on and off rapidly. but the CEL remained OFF the whole time which means it WORKED! now i just need to make the circuit more efficient.

the biggest step to increasing the efficiency of this circuit is eliminating the relay. now, i know a lot about chassis wiring of vehicles and i know a bit about interfacing with multiplex systems in new vehicles but when it comes to small circuits im going off what i remember as a kid playing with my radio shack 500-in-one circuit learning thing. i think the best thing to replace the relay is a transistor.

right now im researching on line learning as much as i can about transistors and i've downloaded some circuit simulation software so i can mock up my egr bypass on the computer and make sure its all going to work properly.

thought i'd share my progress with you guys. any input or suggestions would be great. especially if you're and electrical engineer ;)


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Last edited by Nfrank89; 10-17-2010 at 01:43 AM.
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Old 10-17-2010, 08:42 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

If you figure this out and get it to where it works great, you should do a complete writeup, or sell them :) I would definitely buy one! I hate that damn CEL Lol.
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Old 10-17-2010, 09:32 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

or if you have a chipped ECU, you can simply turn EGR off
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Old 10-17-2010, 09:40 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

Haha this is true as well. It just bothers me how we have the one OBD1 ECU that Honda made that looks for that crap :/ Lol.
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Old 10-17-2010, 10:33 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

make me one haha
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Old 10-17-2010, 03:13 PM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

its easyer to add a few upgrades and like nick said chip the ecu delete egr.

and another thing anyone who thinks deleting the egr gains hp is wrong,
the egr just recycle gases coming out of the chamber, and mixes it back in with fresh air
ive already had my fun with code 12...
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Old 10-17-2010, 08:13 PM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

Yeahhh, but my EGR got clogged and I was too lazy to clean it soooooo yeahhh. Lol. I just disconnected it and called it a day. Laziness is never good :(
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Old 10-17-2010, 09:41 PM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

yeah i know theres no gains to be had from this i just wanted to remove all the extra vacuum lines and junk under the hood. i know others have done the same and i think theres some people that will be interested in this. im really enjoying the challenge of trying to figure this out and solve a problem that no one has successfully tackled yet. and yeah chipped/tuned ecu's aren't cheep
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Old 10-17-2010, 11:38 PM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

You make me little magic chip?????? and will your chip work for 5th gen?
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Old 10-18-2010, 02:59 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

Good job dude I need one as soon as you finished it :D
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Old 10-18-2010, 03:37 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

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Originally Posted by Oktoberyzing View Post
You make me little magic chip?????? and will your chip work for 5th gen?
honestly i havent looked at the schematics of the obd2 ecu but it will probably be similar. i imagine the programming is a bit more advanced than that of the obd1 though and its looking for more than just an open or closed signal. it's probably variable in relation to the map sensor and if the readings from both are not close enough at the right time then it will probably throw a CEL. if thats the case then the next step would be finding a way to just switch the signal from the map sensor off and on (to the egr sensor wire) when the ecu opens and closes the egr solenoid. in fact that may be a more efficient way to do it on the obd1 as well.

we will see. once i get a fully working prototype ill do some more testing to find ways to make it more efficient and less invasive.

hmm now that i think about it i may just go with the map sensor signal... it would use less parts and probably work on both obd1 and obd2 computers. i havent tested the output of the map sensor yet so i have no clue if it will provide the right resistance range i need for this bypass to work. although... i dont see why it wouldn't... :) back to work!
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Old 10-18-2010, 03:23 PM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

SWEET!! i love talkin to smart ppl, haha. even though i have remotely no idea what your talkin about, its sounds good to me, because you sound like you know what you're talkin about!! Good Luck, if you can figure on out to work with obd II and dont want a whole lot for it i may be interested in buyin one from you
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Well, if you can't fix it with a hammer, then it's an electrical problem.
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Old 10-20-2010, 02:00 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

Update! so i was kind of stuck for a bit there trying to come up with a solution to the relay problem. i was mocking up the circuit with simulation software using an npn transistor trying to switch via ground finally i looked to a forum for help and all i had to do was switch it to a pnp transistor! the circuit works perfectly in simulation but i have to wait till tomorrow to pick up 2 more resistors to complete my physical model. ill test tomorrow on the solderless breadboard and see what happens!


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Old 03-08-2011, 02:59 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

did you end up getting this to work??
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Old 03-09-2011, 12:37 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

i just opened a shop, been to busy to fiddle with this project :/
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Old 03-10-2011, 12:52 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

you make Nay-Nay proud!
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Old 03-10-2011, 01:34 AM
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Re: Finally eliminating the CEL with EGR bypass for 4th gens

hmmm?
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