safc wiring to ecu

[koukiKA240]

I am installing a SAFC in my s13. As of right now i have pulled the engine and transmission and i am waiting patiently for my clutch to come in. I figured i would try hooking up the safc while i wait. Yesterday i got everything spliced in place. I soldered all connections and followed the diagrams perfectly. I used the world n3-b diagram to hook up the safc as said on apexi's website. I have gone back and re-soldered the 2 grounds and power wires and i still cannot get the thing to turn on. I was told that the safc would still turn on even if there is not engine in the car. today i have gone back and taken apart the solders for the 2 grounds and power wire. I snipped off the ends with all the solder on them and went to the hardwares store and baught wire taps. I used wire taps to tap the ecu and i still cannot get it to turn on. Yes the battery is in place and my headlights and other accessories turn on. I took a voltmeter to all the connections i made with the wire taps and they all read .6-1 volt. I know im not a master electrician but i thought i could at least solder correctly. Anything helps i dont want to have to tow my car somewhere to have them hook up a few wires. Ive come too far to give up now. If pics of my cluster ----- would help lmk.Thanks~Sam

[s13sr20chris]

do you have 12v ahead of your soldering? check power and ground serparately when you are testing. where did you get your power from? may have a fuse or fusible link blown.

[koukiKA240]

the power came from the ecu the way it is set up in instruction manuel. Not sure if i have 12v because the faulty wiring could be in the grounding.

[s13sr20chris]

yeah, you need to do a voltage drop test bro. test voltage drop across the ground and then across the power.

[Tx-Sx-FS]

hey kouki...where did u find the World N3-B diagram? i cant find it...or is it just the N-1 setup??

[onosqv]

yeah, you need to do a voltage drop test bro. test voltage drop across the ground and then across the power.

Can you kindly explain the voltage drop test? I have a multimeter and barely know how to use it (if you use it at all to test ground).

Thanks.

[navysnail]

put the black wire on the negative terminal of the battery, then put the positive wire on the ground, it should read 0 volts, if its more then that, its a bad ground

[onosqv]

put the black wire on the negative terminal of the battery, then put the positive wire on the ground, it should read 0 volts, if its more then that, its a bad ground

Sounds cool. Makes sense.

Only problem: I'm not sure how to extend my multimeter wire long enough to reach from the battery to my ground inside my car. Is there another way? I'm guessing just putting the black wire on chassis, and red wire on ground?

When you mean black wire and red wire, these are the multimeter wires yes?

thanks!

p.s. I hate this thing where it doesn't automatically notify me via email when a reply has been posted. I have to remember to check the button, arrggghhh.