SR20DET wiring help.

S

silkywilson

Member
Ok I have been building this car for 9 months, the car ran fine when I started.. see post here.

http://www.sfldrifters.com/forums/showthread.php?t=29462

Here is where I am at, I trunk mounted the battery, Pos cable directly to the starter and the ground is to one of the back seat bolts. I removed the battery (from the front) 8 months ago looking now I cant find the negative terminal that was used.. not sure where it went.. So I'm not sure if I'm missing a ground some where..

#2 issue is while mounting my ECU 2 wires came undone (these wires were obviously swapped around by the PO doing the SR swap) they were held with crimp connectors right at the ECU plug.. anyhow one was a blue wire that came loose and one was a yellow wire.. the two wires on the plug that they came off one was blue with a stripe and one was yellow with a strip I figured simple yellow/yellow and blue/blue and reconnected them but couldn't be sure which one came from which one...

I turn the car on, the dash comes on and the dinging starts, but I hear no fuel pump, my NEO (AFC) does not fire up and obviously no starter..

Any hints here? should I swap the 2 wires I reconnected? should I be looking for a ground problem? where do I start here???

Anyone got a SR swap wiring diagram?

And of course I'm stressed for time on this project... Moving in a week..

Any help is greatly appreciated.


UPDATE (I hate auto merge)

Ok I got excited when I found a blown 10 Amp fuse in the drivers kick panel, replaced it and nothing new.. I double checked the rewired harness, and every ware is colored the same.. blue to blue, brown to brown, red to red, black to black, I don't see how my yellow to yellow and blue to blue could be wrong? is it possible in the harness of say 10 wires there are only 2 that are crossed, and those two just happened to be the two that pulled loose from bad crimps?


RECENT THINKING AND TROUBLE SHOOTING..

the dash lights and door dinger both work.. that tells me my battery is grounded ok.. what it seems like is the ECU isn't getting power at all.. or ground.. isn't the dash hooked to the ECU? One other thing I did which shouldn't effect anything, there is a red wire that comes out of the steering column area.. it had this 3 foot long but connected wire hooked to it and then grounded at the e Brake handle.. I shortened it and grounded it at a grounding point on the dash subframe.. this shouldn't make any difference to me though.. I'm just trying to think anything thats changed.

Update again....

Swapped the wires on the ECU (thought this could be worst case scenario) and nothing changed.. I theorize its early in the power chain, Fuel pump and Neo does not turn on..
 
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North Fort Myers, middle of no where.. somewhat sux,,

More Updates..

I found the original Negative cable from the front mount battery, it simply grounds to the intake bolt with no other wires coming off of it. so basicly there shouldent be a missing ground..

No fuel pump
No starter
No NEO

Ecu controls all of this I'm assuming my ECU is possibly burnt.. can welding on the car some how spike a ECU? in the past 8 months there has been many times of welding.. other than that I couldn't expect my ECU to simply take a crap in the middle of a 8 month sit.

More updates

Spent part of the day with Dayron and Jamie thanks guys for all the help, re did all the possible ground combos, moved grounds, the whole deal, Jamie (Builds SR Harness's) was astounded with my harness.. I think her referred to it as crap, or shit, or retarded (no offense to anyone who's crap shit or retarded) He believes the harness is the issue, and if it isn't the issue its near impossible to track the issue with the harness how it is.

Problem for me is I know the harness didn't change since the last time the car ran. I think I'm going to take the chance and call Moe and just have him over night me a new ECU.. Problem here on the wrong coast is There isn't even a ECU available to test it.

Jamie has a ECU but its not his (its a friends) and he doesn't want to take the chance of it eating shit due to my wonderful harness. 100% kewl I wouldn't want a friend of mine putting my ECU in danger to help out some random dude..

Dayron and Jamie, again thanks for all the help, 4 extra hands, and 2 extra brains goes a long long way when troubleshooting. I will defiantly call you guys If I have to hand load this car (hoping I wont) And Jamie I'm not sure you were serious about the S600 trade but it keeps crossing my mind.. LOL
 
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UPDATE AGAIN

Ordered a ECU from Moe at JDM of Miami hes overnighting it to me today. SO hopefully thats the problem. If that doesn't work I will try a new ignition switch.

Just seems some where in there, the ECU isn't being told its time to turn on. weather thats controlled by the ECU itself or the ignition switch some thing is wrong.
 
hmm i have close to same situation with my rb20det, i wired up my SAFC power wire through the ECU power and on the SAFC my dumbass left two wires ground n power undone and they touched, since then the car wont fire up at all it will crank forver, ive looked over numerous articles on rb20s but no luck i think its the chasis problem because on my ignition there was a red wire that ran all the way back to my fuel pump weird right? i disconnected it, it still ran fine before i did that, Ive had a reputable shop look at my harness but no luck, everything works on my end except car wont turn over or fire, id say check the chasis wiring i think i have to replace mine, i dont know if welding on ur ecu would damage it that badly,, good luck man,
 
thanks, as of right now the car drove into my garage 8 months ago, only wiring changes I did was rear mount the battery, and I shortened a ground wire.. Jamie re lengthened that ground wire and we ran a ground from the battery to the original neg. battery cable (so all things are 100% exactly as they were... and same problem.. no worky worky.. I know my harness is shit.. but I doubt it to go from working to no worky worky while just sitting. has to be a reasonable explanation.
 
OK update.. Got the ECU from moe.. I couldent tell what ECU the car has in it, because the PO had spray painted both sides of the ECU. I ordered a J4, basicly that should work Moe thought.. Anyhow plugged it in and no change.. same problems.. with some thinking time I looked at everything.. the one wire that was grounded to my e brake mount that was shortened and then re grounded to the ebrake in all our trials, well when Looking at it, its a red wire.. Nissian wouldn't ground a red wire, but I dont have a clue how the PO wired this car.. anyhow I figured WTF nothing can hurt now and I wired it to Batter +12v, and guess what my Neo came on and my fuel pump came on.. still no starter. While clicking the key and hearing the relay thunk open and closed, I just chased the signal then remembered removing a 1 wire spade connector at the starter when wiring the rear battery, needed room to bolt the battery cable to the starter when check damn right it wasn't hooked up starter solenoid wire..DUH.. LOL Wanna guess what happend then? the car started. LOL go figure.. so basicly 2 wireing issues in one, one definatly my fuckup, but that got figured out qiock, I am still not sure how the ground/12V+ swap issue happend, I looked all over under the dash for anywhere that 12V+ could have been hooked to and NOTHING, same with looking for a ground wire.. NOTHING.. this car is seriously Christine..

Now.. car runs, but not good..LOL I think its spark issues, when you get into the throttle it misses and bucks, looks like the Neo is set to 0 on everything basically not changing anything.. thinking could be plugs or igniter now.. but at least I got my issue of loading the car on a trailer straight.

PS all this is done with my same ECU, when I plugged in the J4 (due to bucking and missing issues) the car wouldent even start.. so evidently a J4 ecu don't work with my blacktop..lol
 
bro you might wanna take it to AERO K they know what they are doing my car had same issues...and now is in perfect condition !!
 
LOL Im moving out of state in 2 days.. You dont remember what the problem you had was? or what they fixed? Right now its runs good till about 3K RPM then it breaks up, Tim thinks its a boost leak, which is entirely too possible with new hard lines and me putting shit together in the rush I am in..

On my own ide say its loosing spark past 3K RPM, and I dont have a clue what the plugs look like, so they could be assed out for all I know.
 
Get the plugs from an older Sentra i believe with the SR20DE motor. Also, tune your car when you get to GA. Find someone to tune it and probably replace every damn gasket you have on the exhaust side. Congrats, now you dont have to have jaimie and dayron push that thing on the trailer with you. haha
 
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