starting problem as well(25 in s13)

[rb250sx]

i was going to put this in the other starting problem thread, but didnt want to highjack it, but im also having problems starting my car(rb25 in s13). i know it is because i dont have power to the ecu. i traced the wires and i have power at the red and the black/red wires conneted to the 6 prong plug in the 8 step process. the red wire traced into the white efi plug and then back into the engine bay to that 8 prong plug(im assuming thats power to that starter signal, but i ran it though the KA ignition wiring) and the black and red wire runs into the white efi plug as well, but theres no pin on the other side, im assuming this has to run into the eccs relay correct? there appears to be wires connected to my ecu in pin 109 i belive power is supposed to be, and that traces into the eccs relay fine. So it appears that i just need to connect this power from the white efi to the eccs relay? i hate working with a haxed up harness, please help if you can.

[S13Sil-line]

Not to question you but I had the same problem until I realized I didn't connect the black/white-black/yellow for the starter. Then it fired right up. Did you connect those wires yet?

[JonPowell]

Is your problem no crank or not firing up?

Constant power to pin 58Switched power to 49, 59, and 109

[rb250sx]

thanks man, yah my problem is firing, its cranking fine, but no power to the ecu to power the fuel pump or injectors

[rb250sx]

ok, ive been staring at diagrams and heres what im looking at. in xjons writeup it says that the red wire is going to AF04 which runs to the ingnition relay, and the black/red wire gives power to AF36, which powers DA31 to the ignition relay. Now if im not getting power to my ecu, and jonpowell pointed out i need power to 58 all the time and 59 49 and 109 switched, all that power comes from the eccs relay. now im not the brightest guy and hated taking wiring courses in college, but can someone possibly tell me where the power comes into the eccs relay? does it come from AF49(orange wire) between the 2 relays? it appears to me that i shoudl have power coming in from AF29, the white/black wire from the white efi plug. but we never connected power to that. if the electrically inclined people are out there, i could use a little more help.

[S13Sil-line]

LOL, Man I really want to help you out. I did my wiring by red>red/black. All that pin stuff confused me. I figure any help is better than none, so what little help this is her I go. Read the 8 step out loud to yourself while looking at the pictures, and then look at the actual wires to your car. I'm sorry your reading stuff you most likely already know, but it helped me a ton. Is it possible your motor has power and the injectors are not firing. When I did my wiring I cut the injector wire and splice it to its power source (injector to end of the cut wire) but left the rest of the wire that goes to the ECU unspliced. Still wouldn't start so I connected the other side (ECU to end of the cut injector wire) and BAM! She fired right up.

[rb250sx]

spent most of the day tracing more wires. For starters, i have no ignition relay or any wiring for it anymore in my harness, and the pins on the white efi plug are all wrong or missing. for example, the white/black wire that is supposed to go from af29 to the eccs relay, well for some reason its going from cqs51 which the factory didnt even use. i dont know why he had the bright idea to pull all the wires out and try to repin it, but he obiously didnt know what he was doing. im thinking i would almost be better trying to find another series II harness. But ill prob spend the next week repining the efi plug. heres a picture of what the plug looks like now, just for reference to what im dealing with ahha.

on a side note, anyone have an extra series II harness they want to sell? haha

[rb250sx]

i just talked to the kid in texas who hacked the hell out of this harness, and apparently it was repined because the s14 1/2 had a white plug like that as well, and he was making it plug and play for that. as far as the ignition relay, he claims it was too long ago and he cant remember. sooo....my option here is to reping and rewire what i can and hope its all right. does anyone else have any suggestions, or know where i can get another harness?

[theXfiend]

Mckinney motorsports sells RB25 harnesses. or you can just pin it correctly there is a wiring diagram for that plug luckily

[rb250sx]

well, i just repinned the plug, but thts not the only thing wrong with the harness. im still not getting power into the eccs relay, and im assuming the power comes from the ingition relay. but there is no ignition relay. I cut a relay out of the fuse box and was starting to wire it in, but ran into a problem. The red, orange, and black/red wires arent a problem, but i was trying to find the whilte wire running to the 2 prong plug to the coils. theere were two white wires running to the coils, one came out of an 8 prong plug and the other looped back under the cover. i tested the white wire, and it was hot when the ignition was on. taking hte cover off showed that it went to every coil just like the white wire in the schematic, so i started to trace this wire back to see where it went. it ended up connecting up with 2 white wires going towards the injectors, and a grey wire heading back to the ecu(none of which were in the schematic) and the grey wire tapped into the black and red wire back at the ecu which we can connected power to. these wires were connected together with horseshoe type clamps, and the same up whre the 3 white wires and the grey one connects, so it appears like it was factory. So my question is, is this supposed to be like this on a series II harness, and does anyone think that if i connect the white wire into the ingition relay that will give me power to my eccs relay and to my ecu. I know most of what im posting is jibberish, but if anyone can help me it would be greatly appreciated, this whole thing is starting to get on my nerves.
Modified by rb250sx at 4:11 PM 11/18/2004

[Bluefire]

Dunno if this will help but I wasn't getting power to the eccs relay also. So all I did was connect a line from the constant 12v on the relay directly to the battery.

-BLuefire