New engine harness, still wont run...losing hope :(

[bgsr240]

I bought a new harness for my S14 sr20 in my 89 S13. I had a feeling that it wouldnt really make a difference as far as it running, but since it was in such poor shape I just wanted to get a new one for reliability reasons. Anyway the problem is is that there is no signal to ignitor from the ECU. The injectors fire, coilpacks all have power, wiring is done 100% correctly. This is the wierd part, I know that the ECU and ignitor are both good because I swapped them out on a buddy's car and they both work, his car will run just fine. I just dont know what to do next spend another $250 for a new ECU on top of the $400 for the new harness?

Also I was wondering what voltage everyones neutral switch is reading? Mine reads about 4 volts in neutral and all gears except reverse. If I recall correctly it should read 0 volts in neutral. I can get it to read 0 if I kind of put halfway between neutral and a gear so I guess it should still allow the engine to start. ???

Really this is only one of many problems that seem to plague my car. The dash lights, sidemarkers, turnsignals, fog lights, tail lights, and brake lights dont work. But really the worst problem that has arisen is that the starter wont crank, it has something to do with the black/ yellow wire off of the ignition switch, probably a bad ground or lose connection somewhere. I'm not really worried about any of that right now, because it will just take some time with a test light and a multimeter and I can figure it all out.

What I'm really just looking for is the signal from the ECU to the ignitor. I'll be happy with just that, even if I cant get the car to crank right away.

ANY suggestions???

I should of just went with a redtop, my life would be SOOO much better right now.

Thanks, and sorry for the pity party, but its been close to a year since I started this project.

[duffman1278]

For one, how are you sure the wiring is done correctly? Did you send it out to someone? Have you made sure the ECU is the correct one for your motor? Also, have you checked your grounds? Just incase, I would double check the wiring, make sure no wire is touching, and that the right wires are spliced with the right ones.

[bgsr240]

Thanks for the reply. I bought the DVD advertised at the top of this forum to make sure that everything is done right. I really didnt check for continuity yet on the new harness but I'm positive that everything will check out.

My motor is the early model Zenki 94-96.5 S14 Sr20det. The ECU says Nissan Remanfactured Unit (WC is nowhere on it) along the code 69F01.I know that there is a page on here somewhere that has all the ECU codes but I cant find it back.

[duffman1278]

Yea I'm pretty sure the continuity will check out since its new but you still had to splice some stuff to go from S14 SR into an S13. You might have broken injectors. On my SR, I had one injector that looked perfectly good, ends up it wasn't even working, wouldn't spray any fuel. So try and see if you are getting fuel through

[duffman1278]

Anyway the problem is is that there is no signal to ignitor from the ECU.

But you said that you're getting spark, you can't get spark if there's no signal. I think the best thing to do is start from the beginning, and work your way over to the coilpacks, make sure you have voltage from the ECU to the input ignitor plug than connect the ignitor and make sure you have voltage going to the output of the ignitor, than if that clears out, to the coilpacks. But I don't understand how you can get spark without a signal from the ECU

[bgsr240]

Lol. What I ment was that the coilpacks all have 12 volt power coming directly from one of the relays next to the ECU. It is the four signal wires that go from the ECU to the ignitor chip that have no signal. Basically all the wires that go to the input ignitor plug do nothing, which I'm guessing causes the four wires on the output side to read 0 volts. As for the injectors I know that they all are functioning because I removed the CAS and turned it by hand and all four of them click.

At this point I think that my car is possesed or something lol, because like I said both the ignitor and ECU will run my buddy's car.

Again thanks and any more advice would be greatly appreciated.

[duffman1278]

I think the best thing to do here would be to swap try and used your friends harness, ECU and ignitor and swap it into your car. If that works, than it has to be something electrical on yours. If not, than your car has bad luck haha

[bgsr240]

His motor is in an S14 chasis, so the wiring harness is a no no. But I will try to get him to let me use his ECU and ignitor

Believe me bad, bad, bad luck

I noticed that your from West Covina. I ordered my harness from the Nissan dealer there, or I guess it was called the nismo shop.

[duffman1278]

Yea, its like 5 minutes away from lol, to be exact 1 exit on the freeway from me lol, awsome people there!

But anyways, try his ECU and ignitor onto yours. Also, open up your ECU check for any burned marks around the circuits(check both sides of the ECU)

[bgsr240]

Yeah they had the lowest price of anybody on the entire net.

Well already checked for burns. None that I can see. To be honest I am starting to think Apexi Power FC. By the time I buy a new ECU and have it tuned I'll have the same amount of money in it... and the tunibility factor.

You wouldnt happen to know if 69F01 E83 is the correct code for a Zenki Sr20 ECU would you?

[duffman1278]

That I wouldn't know, I would probably have to look it up on Nissan FAST, but its on my comp at home.

Well lets see what happens with your friends ECU and ignitor. Check your relays too, according to FSM, there's should be 2 of 4 pins that should be getting voltage.

[bgsr240]

I didnt get to trying out the other ecu and ignitor because the weather was bad. But I did get the dash lights and all of the other lights that didnt work on the car fixed. I also got the interior and the front bumper in and back on. All I need now is for it to actually start, coilovers, and rims that clear the front brakes. Then I can actually drive it.

[tucker3113]

Do you have no power to the ignitor or no signal from the ecu? I am not to sure but is your CAS any good because I think if there is no signal from it to the ecu then there is a no spark problem also so make sure to check that also.

[blackmagic]

check your ecu codes for a kick.

[bgsr240]

Do you have no power to the ignitor or no signal from the ecu? I am not to sure but is your CAS any good because I think if there is no signal from it to the ecu then there is a no spark problem also so make sure to check that also.

I know that the CAS is good because I can turn it manually by hand and it will fire all of the injectors.

check your ecu codes for a kick.

I dont really know how to check for codes and I m not really worried bout it because when I finally get time I going to try my friends ecu. thanks though.

[david200095367]

man sorry for all the bad luck. i got my s14 sr from osaka started on the first try.

[bgsr240]

man sorry for all the bad luck. i got my s14 sr from osaka started on the first try.

Thanks for rubbin it in lol. Haha maybe I just have really bad luck?

[blackmagic]

well if your friends ecu doesnt work then try checking for codes its easy takes mabe 2 min. if u lose your screw driver. look it up with the search button.

[duffman1278]

Thanks for rubbin it in lol. Haha maybe I just have really bad luck?

Don't even worry about it man, I've got problems starting mine too, ocne I fix one, another one comes, I'm hoping I'm near the finish line already because its pissing me off

[FAST-DATSUN]

How do you knoe there is no signal to the ignitor??? How did you measure it??? Are you usung the FSM to check the signals and power to the ignitor???

[bgsr240]

Well with my friends motor when the key is on there is power to both sides of the ignitor. With mine there is none. I check it using a multimeter...

I checked the ignitor using a continuity test like the FSM says to and it checks out fine.

I dont know, this is so wierd. I've never had any problems like this with any of my other swaps.