completely bamboozeled

ONLY for ADVANCED technical discussion about the 240sx!
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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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i recently got an 89 240 auto cause the frame on my 91 5 spd broke. i have an sr swap so i pulled everything from one to the other clutch pedal assem new clutch line etc. i ended up using the harnesses from the manual and just got everything buttoned up and a no fire. i had no problems before i swapped everything i even started the car before i took it apart. i am getting fuel to the rail but no injector pulse or spark that i can tell. so i swapped all the relay's and fuses from one to the other and the main relay behind the fuse box. and still nothing!? should i have used the auto lower harness or is there something that i am forgetting please help need car asap thanx in advance


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locoluna825
Posts: 862
Joined: Fri Mar 28, 2008 12:09 pm
Car: 90 240sx coupe

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do you still have the auto starter in it? did you bypass it to make it think its always in park. did you hook up the clutch?

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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yes i looped the nuetral switch i am sr so i have to use the sr starter and the clutch is hooked up and bled. i read somewhere about a fusible link is that maybe an option my next idea was to swap the whole main harness as i still have to doner. when i got the car it didnt run guy said it had sat for a while and i couldnt get it to start. was gonna give the engine to a friend i assumed the motor was shot. maybe faulty wring. anyway im gonna pull the sr harness an go back through the wiring maybe something happened while it was sitting around. sry for the long post thanx again

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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easy way to check for power to ecu?

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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i ran codes for ecu and said 21 for ign sig i then looked for the relay and the 91 has itin the pass side fuse box but not the 90 dosent look like it was removed just not there. does anyone know where the ign relay is or where i am supposed to wire the signal to?

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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bump cmon guys need serious help pretty please

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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so does anyone know why i have no damn ign signal to the ecu. i have changed every fuse every relay checked all ground with ohm meter and i cant find anything wrong as i said full swap ran in previous car same exact wiring the only difference is that this one is an auto and yess i looped the safety switch now im just pissed at the stupid thing and am about to push it off a cliff(literally, i have one close by) cmon guys

Vegascorbin
Posts: 732
Joined: Sat Nov 24, 2007 9:56 am
Car: 1990 240sx dirt track race car

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Sounds like you found your problem. Just trace the wiring back from wher ethe IGN signal enters the ecu and find where the wire got damaged.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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thanx i am acquiring a fault finder from my dad (works on semi"s) so that i may tace the wire and find out where the prob is i gave up from reading my post i sounded a bit like a baby ready for a nap sry for that patience is not one of my best traits thanx again

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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so i still can.t find the prob . i have decided to just swap harnesses from the 91 hicas. is there anything i should know before i do this? at the same time i am also going to do a semi tuck and get rid of misc. plugs that are not needed ex: abs

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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traced wires from abs plugs to fuse block labeled ign relay/fl 30a anti skid is this just for the abs

86sen89240
Posts: 18
Joined: Sun May 10, 2009 3:54 pm
Car: 89 240sx ka

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Before you go too far n git pissed again. At least take the time to checkout a company called "painless wiring" out of ft worth tx. the problem may have occured while removin one of the old sets from its orig veh. Painless offers complete wiring from from sleepy eye to whale fin!!!

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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thanx i'll check it out

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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was wonderin if anybody knows if i should use the auto lower harness because of the extra plugs by the fuse block for the trans or if they dont matter

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hvp014
Posts: 369
Joined: Fri Sep 15, 2006 6:06 pm
Car: 89 R32 GTR
Location: Okinawa, Japan

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Sounds like your having a good bit of trouble, Check the swap guides again for the auto to manual swaps. Also be sure to double check all of your grounds to the ECM, and engine. Finally recheck your wiring job on the SR swap. If all else fails swap the lower harness over as well.

Good luck and sorry I wasn't that much help. Just step back and relook over the basics.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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(deep breath).......ok, ive swapped the entire bay harness out of a same year manual (90) and now i dont even get a crank but im pretty sure it is because of the clutch safety switch. but i cant seem to find it on the fsm provided by nico so i was wonderin if any body knows off hand or were exactly i might find it in the fsm i believe the plug is in the similar area as the auto, under the pass relay box. sry for the long post and thanx again

Bongpain
Posts: 89
Joined: Tue Feb 01, 2005 3:53 pm
Car: 92 240sx

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hey check out these pics maybe it will help.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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my friend has just acquired a vafc2 i know that is a vtec controller but i was told that you can leave the vtec off and just run it as a safc2 anybody confirm this? if so i might try to get it off himhe traded rims for it but he needs cash quick responses would be great thanx. oh.. i think i found the prob with the car i found a burnt spot on the acc 2 relay under the hood so i think there is a short i the fuse box inside the car. p.s. swapped to whole new bay harness didnt find the burn spot on the old harness till after i already took it out of the car. and now i see a small burn spot on the new one and its fresh so time to swap out main car harness. its gonna be a long weekend thanx again guy and girls

Sil240
Posts: 2973
Joined: Mon Apr 28, 2003 5:26 pm
Car: Nissan S13 "The One Cam Wonder"

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its because of the white plug buy the ECU.

The 89 SOHC and the 91 DOHC differ there.

That's why your wiring swap over would not work.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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what is the diff between the two white plugs (you mean the white boxes by the drvr side fuse block?)

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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nevermind u mean the dash plug? yes i swapped it out the 91 is brown and the 89 is white

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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does no one know anything about the vafc issue?

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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ok swapped whole dang car harness over and still a no start. getting a code 21 ign sig but the only thing im not getting is spark. how do these relate?if the igntr chip is dead would it throw a code 21? and how do i check the grounds for continuity i know its ohms but do not know what it is exactly or ball park figure. around 2-3 ?also how do i check the signal wire from the ecu?

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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bump!

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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still having same prob does anyone know if the ignitor would cause a no "click"scenerio and would it also throw a code 21 ign signal? please help!?

Bongpain
Posts: 89
Joined: Tue Feb 01, 2005 3:53 pm
Car: 92 240sx

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i have had a code 21 before. i did an sr swap on a buddy's car and found no start no crank. vehicle have the battery relocated to the trunk. battery test GOOD. ground was questionable. clean ground in the trunk and clean ground and positive cable in the engine bay. replace battery and start with no problem.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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i have an braille battery and still in engine bay even tried starting with buddies and no luck. at first i thought i might be ground cause i painted the engine bay. but i then replaced whole under harness(with fuse block) and sanded spots for factory grounds and still no luck thanks for the input though i am about to a ground wire kit and ordered another ign chip.the only other thing that is different this time is i sold my earth ground kit to a friend cause i was gonna buy/make a better one maybe i just have a really bad grounding system in the car and earth set was helping some how i never pulled it off the other car when it ran heck i never pulled it off the engine (came on the engine when i ordered it from j-hot) until i swapped it to this car hmmmm........ i need to make a phone call!

574-240sx
Posts: 9432
Joined: Sun Dec 01, 2002 6:27 pm
Car: Nissans, Toyotas, Subaru

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I have a Q45 ignitor with plugs and a little bit of harness you can splice into. I'm also really close.

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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i appreciate it but by the time i saw your post i already ordered one thanx though i hope it works it would be the s**t! and would probly make my year

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sideslider240
Posts: 74
Joined: Sat Mar 29, 2008 5:56 am
Car: 91 240sx

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so the damndest thing happened got the new ignitor and car started right I WAS TRILLED to say the least must have started it a dozen time to make sure then put it away for the night today i got up early and went to put the rest of my car together didint try to start it i just pushed it out side and started to put the interior back together and got it done and the new radio in and wnet to start it nothing no click nothing so i jumped it with my truck battery was dead let it sit for a bit and cranked just fine.......but no fire. instantly pissed i start going through the wiring and double checking then i check ecu code 21 again!? i do the test on the ignitor and its dead wtf anybody have any ideas? and 574-240 if you see this i am gonna need that ignitor after all i hope i hear from ya soon


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