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PSA EFI pin 30 NSS

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,122
Public Service announcement EFI NSS pin 30
Maybe this will come up in searches.

This is the most screwed up item going when installing EFI..

Pin 30 is the NSS ( neutral safety switch) when the vehicle came from Ford it is installed to tell the EFI computer that the vehicle is in neutral. Ford did the connection using the O2 harness if you have a nice factory O2 on the part number tag it will say manual or auto under the part number. so if you have a manual computer you would need the correct O2 harness to match.


If you look on a Ford wire diagram http://forums.corral.net/forums/showthread.php?t=1174340 you will see it is broken down to to 2 options Manual and automatic transmissions. the transmission type is not a factor when hooking up EFI.. let me say that again... the transmission type is not a factor when hooking up EFI. once more in case you missed it.. the transmission type is not a factor when hooking up EFI.

The computer code is what dictates how to connect this up correctly.
Ryan has already done the homework look it up http://fordfuelinjection.com/?p=17
here are 2 examples A9L& A9P

A9L this is a manual computer pin 30 (NSS) will connect to pin 46 (sig rtn)
A9P this is an Auto computer pin 30 (NSS) will connect to ignition start wire

now just in case your uncles brother-in-laws sister second cousin was a Ford tech and told you that pin 30 does not need connected or modified when swapping in a motor and you go ahead and start it and anyway here are possible issues.

Computer will not return any codes when connected to a "scanner'
there is code 67 when you do get codes.
Idle sucks or hunt.
motor will start & run but once it get over 170 degrees it will not restart until cool.. you have now burned up trace in the computer ..need to replace or repair..
 

marty

Sr. Member
Joined
Apr 18, 2008
Messages
867
Loc.
massapequa, n.y.
i will admit i am a victim of this and trust me it had my head spinning thinking it was other things causing these symptoms. since i have them hooked now the truck starts and runs in cold start like a dream it even seems to run down the road different but it could be in my head. i must have accidently missed this step in the instructions and have been dealing with all sorts of issues like cold start idle and backfiring through the intake issues but i also had issues where i could drive it 25 miles one way and 25 miles back and no check engine lights. shut it off come back 5 minutes later and boom have idle issues and check engine lights it would come up as code 66 mass air meter voltage low mean while i did all the tests on the mass air and harness and it comes up good. one thing i would say is that when doing the rjm harness check off each instruction number with a pen so that you know you have completed i made this mistake and would hate to see some else do the same. a big thank you also goes out to the gurus here that helped me locate my issue i owe you one big time.
 

66fora69er

Contributor
Sr. Member
Joined
Dec 9, 2006
Messages
479
Good Info Ransil, but if you look at this diagram http://fordfuelinjection.com/?p=6 it shows that wire grounded for an auto trans. I am going to re-check it but I think I do have it grounded but have experienced some of the symptoms you mention "motor will start & run but once it get over 170 degrees it will not restart until cool" Its been running great lately but if its wrong and I have damaged my computer I want to fix it.

Thanks again for the information
 
OP
OP
R

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,122
Good Info Ransil, but if you look at this diagram http://fordfuelinjection.com/?p=6 it shows that wire grounded for an auto trans. I am going to re-check it but I think I do have it grounded but have experienced some of the symptoms you mention "motor will start & run but once it get over 170 degrees it will not restart until cool" Its been running great lately but if its wrong and I have damaged my computer I want to fix it.

Thanks again for the information

That is not an official wire diagram. see my link in the first post..

But it will work when grounded. why??
when connected per my link in post #1 to the starter solenoid start terminal,after the ignition switch is in any position other than start the wire will be connected to the solenoids coil wire which will be a low resistance path to ground.
 

66fora69er

Contributor
Sr. Member
Joined
Dec 9, 2006
Messages
479
That is not an official wire diagram. see my link in the first post..

But it will work when grounded. why??
when connected per my link in post #1 to the starter solenoid start terminal,after the ignition switch is in any position other than start the wire will be connected to the solenoids coil wire which will be a low resistance path to ground.

Makes sense. I thought I had fixed a cooling issue I was having but after reading your post I think I may have damaged my computer. And maybe I have not been having the "no start if over 170 problem" because the weather has cooled down in TX. If I pull the ECU cover will I be able to see the burned area if damaged? Also, if its working fine grounded should I change it to the start wire or leave it alone? Thanks
 
OP
OP
R

ransil

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Sep 6, 2003
Messages
8,122
You will need to pull the cover and the bottom, Torx T10 & T20
here is a link to some pics of the burned trace, also looks like a cap can get damaged too.

I also just fix one and the trace was burnt in a different place than show in the pics, I should have taken pics.

http://sbftech.com/index.php/topic,25116.0.html
 

DanWheeler

Bronco Guru
Joined
Nov 8, 2005
Messages
2,549
Loc.
Kirkland, WA
is this what step 18 is all about in the RJM installation manual?

Locate #5 the transmission identification terminals near the Self-Test
connectors. You need to plug the male terminal into one of the female
terminals, depending on which computer type you are using. The male plug is
labeled “TRANS” and the female plugs are labeled “AUTO” & “MAN.” You
need to identify your computer as an automatic or manual transmission
computer by its sticker. If you are unsure of which computer you have your
local Ford dealer should be able to help.

a) For an automatic computer; connect “TRANS” into the Black “AUTO” plug.
b) For a manual computer; connect “TRANS” plug into the Gray “MAN” plug.


I never had to do anything specific with pin 30 that I can remember.
 

HGM

Sr. Member
Joined
May 24, 2010
Messages
973
Loc.
Senoia, Ga.
Glancing at the Ford wire diagram yesterday, I'm a bit confused about the confusion over this.. It looks like the Auto gets power from the starter sol and the Manual gets a ground through Sig Rtn. Didnt look too closely, but I've got access to the documents if you need to see them.. Sorry, just dont get it. Pin 30 is different and needs to be wired as intended with that particular PCM..
 
OP
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R

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,122
Glancing at the Ford wire diagram yesterday, I'm a bit confused about the confusion over this.. It looks like the Auto gets power from the starter sol and the Manual gets a ground through Sig Rtn. Didnt look too closely, but I've got access to the documents if you need to see them.. Sorry, just dont get it. Pin 30 is different and needs to be wired as intended with that particular PCM..


this is correct..

not sure what you don't get..
 

HGM

Sr. Member
Joined
May 24, 2010
Messages
973
Loc.
Senoia, Ga.
this is correct..

not sure what you don't get..

It wasnt directed at your post. I just dont get the confusion many have(based on several other threads) over why a particular pin needs to be powered or grounded.. I'm one that sometimes just takes it as "because, thats the way it is"... The Manual trans PCM is different than the auto trans PCM and needs to be wired as such.. Didnt mean to take away from your post, obviously intended to be helpfull.. Sorry about that..
 
OP
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ransil

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Sep 6, 2003
Messages
8,122
It wasnt directed at your post. I just dont get the confusion many have(based on several other threads) over why a particular pin needs to be powered or grounded.. I'm one that sometimes just takes it as "because, thats the way it is"... The Manual trans PCM is different than the auto trans PCM and needs to be wired as such.. Didnt mean to take away from your post, obviously intended to be helpfull.. Sorry about that..

Did not know what was confusing so I wanted to clear it up so there was no confusion. ;D
 

fastcarkenny

Full Member
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Sep 24, 2009
Messages
340
Loc.
Avondale, AZ
ugg. I thought I had this all figured out until I read this thread. I just want to be SURE I dont do something to fry my computer if I can prevent it. so if I want the neutral safety switch to work on my AUTO trans, I should run a wire from the start terminal on the solanoid to the NSS and then from the NSS to pin 30. Right? Thanks for your help and the warnings. I might have missed this otherwise!
 

av bronco

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Mar 3, 2008
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Palmdale CA
ugg. I thought I had this all figured out until I read this thread. I just want to be SURE I dont do something to fry my computer if I can prevent it. so if I want the neutral safety switch to work on my AUTO trans, I should run a wire from the start terminal on the solanoid to the NSS and then from the NSS to pin 30. Right? Thanks for your help and the warnings. I might have missed this otherwise!

You need to know if you have a auto or manual computer/ O2 harness, if ether one is manual and you hook up pin 30 to.start you may fry your computer.
 
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R

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,122
ugg. I thought I had this all figured out until I read this thread. I just want to be SURE I dont do something to fry my computer if I can prevent it. so if I want the neutral safety switch to work on my AUTO trans, I should run a wire from the start terminal on the solanoid to the NSS and then from the NSS to pin 30. Right? Thanks for your help and the warnings. I might have missed this otherwise!

Like a roadie with a cold sore... you aint gettin it..

NO...........

NSS is referred to the computer connection only, you do no connecting to your tranny or its switches.

connect pin 30 from the start terminal on the solenoid directly
leave the tranny wiring as is..
 

fastcarkenny

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Sep 24, 2009
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Avondale, AZ
Hard not to get that. Will do. Thank you!

I didnt find any other referrence to this, so you saved me a computer and lots of cussing.

Thank you, Thank you, THANK YOU!
 
Last edited:

G's Baja Bronco

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Aug 7, 2010
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Sunny SO CAL
Thanks again Ransil and Crew, this cleared it up. ;D

I pulled the A9L and harness together from a 5 speed 91 stang, I now knoe to just connect 30 to the 46 circuit.:cool:
 

stupidboy

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My wifes porn star.
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Dec 29, 2009
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Morrisdale Pa.
I'm closing in on being done reworking the 92 stang harness. I have to get a fuse block and some relays tomorrow and then it will be done. Just to be 100% sure I have a a9p computer, so pin 30 gets ignition start power right? And does this mean I can just put crank only power directly to pin 30 at the eec?
 
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