Subject	A Note on pin 58 in certain EFI Harnesses
Posted by	mjm0771 on May 23, 2008 at 7:46 AM
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In Reply To	The simplest mod so far... switched power injector rewire. posted by NobleZ on December 21, 2006 at 10:54 AM
Message	Hi everyone, I recently replaced my EFI harness in my 91 TTZ. I followed this writeup, but when I broke open the pouch next to the ECU, I could not find the bundle of injector wires on pin 58. There was only a single 12 gauge wire joined to a 18 - 20 gauge wire that went to pin 58. HOWEVER, I found the injector wire bundle on the other side of the Harness! It looks exactly like the one near the ECU side. To be absolutely sure that was it, I measured Volts when the car was off (you should get +12V) then I disconnected the #1 injector connector and tested continuity between the connector and the bundle. I did this to eliminate any doubt. See pics below. I ended up using a relay, but I'm sure you can route a wire back through the firewall to pin 45. -mike
Follow Ups	The simplest mod so far... switched power injector rewire. - NobleZ 10:54:33 12/21/06 VTF! (n/m) - CaliguyPurdue 11:03:33 12/21/06 Nice. Looks like # 1 should be "disconnect battery". :) (n/m) - Dustin 11:39:13 12/21/06 Damn, and I thought I put in every step.... - NobleZ 13:04:17 12/21/06 Good, VTF! (n/m) - Slobo7x 11:39:53 12/21/06 While I doubt there are significant disadvantages in doing - Zirvana 12:24:37 12/21/06 its more for keeping the newer 555cc nismo's that cost $900 - NobleZ 13:22:45 12/21/06 Don't you think the Nissan electronic engineers would have - Zirvana 14:14:22 12/21/06 If I understand correctly, Nissan DID do it on later harness (n/m) - Crim 15:13:00 12/21/06 Probably because of safety concerns. To kill the power to - Zirvana 16:13:22 12/21/06 Re: Don't you think the Nissan electronic engineers would have - Pacmanpth 15:33:41 12/21/06 Having a bad day? Jeesh. He's not even responding to you. (n/m) - doug8867 16:11:49 12/21/06 I happen to be very experienced in electronic design. Been - Zirvana 16:15:57 12/21/06 you feeling alright there buddy? (n/m) - ZEngineer 12:23:55 12/22/06 Note: this mod is for the pre-95 wiring harness. - SlicktopTT 15:57:50 12/21/06 Do you think the fuel is in contact with the injector's coil - Zirvana 16:17:17 12/21/06 It is. Thats why I throw this theory in the trash can. - spddracer 17:27:46 12/21/06 Any thoughts on why the did fail? (n/m) - lazer(AK) 13:42:53 12/22/06 *reminder: disconnect battery first - NobleZ 13:07:01 12/21/06 Too bad we'll never know if this actually has any affect (n/m) - spicyZ 13:27:26 12/21/06 Classic 'cold solder joint'... - Chas 13:33:15 12/21/06 Can't do better than speculation, but it doesn't hurt - JBender 13:58:45 12/21/06 Lol... yes i will admit, soldering is deffinitely not one of - NobleZ 15:16:53 12/21/06 Solder Flux is your friend (n/m) - TheSlimOne 23:01:05 12/22/06 so...step 6 - spyhunterTT(nj) 13:59:03 12/21/06 That gives the ecu its constant power... - NobleZ 15:19:52 12/21/06 I thought that was confusing as well - 300zx90 (CO) 12:02:52 12/22/06 what is the point of injector rewire????????? (n/m) - redfarsi 15:46:10 12/21/06 With the pre-1995 design, + 12 VDC goes to one side of - Zirvana 16:37:05 12/21/06 FYI, I have 4 original 90 injectors that have lasted 138k. - doug8867 16:07:37 12/21/06 Good job on figuring out this mystery! FYI - A better way - jzack 16:34:19 12/21/06 yeah actually I thought about doing that but, I thought - NobleZ 18:04:20 12/21/06 For others -- my tip should have said using SOLID 20 or - jzack 21:25:39 12/21/06 A Note on pin 58 in certain EFI Harnesses - mjm0771 07:46:34 05/23/08 Re: A Note on pin 58 in certain EFI Harnesses - RomChip200 06:10:47 05/28/08
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