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nissan sentra 1994 - what is the "neutral switch" for ?

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Pszemol
 
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Default nissan sentra 1994 - what is the "neutral switch" for ? - 06-14-2005 , 11:55 PM






I have 1994 sentra E, with 5 speed manual transmission.
I wonder what is the "neutral switch" used for in this car.

It shorts signal to ground when the control lever is
in the neutral position - what does my car need it for ?

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SgtRich
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 02:13 AM






On Tue, 14 Jun 2005 22:55:51 -0500, "Pszemol" <Pszemol (AT) PolBox (DOT) com> wrote:

Quote:
I have 1994 sentra E, with 5 speed manual transmission.
I wonder what is the "neutral switch" used for in this car.

It shorts signal to ground when the control lever is
in the neutral position - what does my car need it for ?
To make sure that the car only starts in neutral?
--
<<<SgtRich>>>
Chicago, Illinois, USA
2005 Nissan Murano SL AWD


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Professor
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 08:28 AM



"Neutral start" switches are only on automatic transmissions... I guess
you're talking about the switch that only allows starting the vehicle
when the clutch is depressed. This is a safety feature.

Professor
www.telstar-electronics.com


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Pszemol
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 08:50 AM



"SgtRich" <UseNewsgroup (AT) NotEmail (DOT) invalid> wrote

Quote:
On Tue, 14 Jun 2005 22:55:51 -0500, "Pszemol" <Pszemol (AT) PolBox (DOT) com> wrote:

I have 1994 sentra E, with 5 speed manual transmission.
I wonder what is the "neutral switch" used for in this car.

It shorts signal to ground when the control lever is
in the neutral position - what does my car need it for ?

To make sure that the car only starts in neutral?
No, my car does not start in neutral.
I have to press clutch to start car, in any gear.


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Pszemol
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 08:52 AM



"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote

Quote:
"Neutral start" switches are only on automatic transmissions... I guess
you're talking about the switch that only allows starting the vehicle
when the clutch is depressed. This is a safety feature.
No, I have separate neutral switch in the lower left side of transmission.
Not far away from the backing light switch.

Safety feature - yes, I have clutch sensor too - dont think they both are related.


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Pszemol
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 11:57 AM



"Peter Hill" <peter.usenet1 (AT) nospam (DOT) demon.co.uk> wrote

Quote:
It tells the engine managenment system you are in neutral.

Short of going though the machine code stored in your rom, operation
code by operation code it's not possible to tell what it does. But it
may not use the same fuel and ignition curves when the negine is not
under load and may have a harder cutoff for the limiter rpm.
What do you think it will happen if I disconnect it from engine ?
Engine computer will then "think" I am in gear all the time,
would it be wrong somehow ? I could try it out, but I am not sure
what to expect and what to check after I do the mod.

I need this switch for my remote starter installation, and I do not
want to connect two circuits to one switch shorting them...
I could use a relay with a coil powered from the accessory +12V
through this switch, and then reroute original wires to the relay
contacts - but it sounds like too much work if I do not really need it


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Professor
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 01:34 PM



So I guess it's only for fault diagnosis... used by the ECU. I would
refrain from disconnecting or you may trigger the check engine light
due to codes being set.

Professor
Check out FlashAlert at www.telstar-electronics.com


Pszemol wrote:
Quote:
"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote

"Neutral start" switches are only on automatic transmissions... I guess
you're talking about the switch that only allows starting the vehicle
when the clutch is depressed. This is a safety feature.

No, I have separate neutral switch in the lower left side of transmission.
Not far away from the backing light switch.

Safety feature - yes, I have clutch sensor too - dont think they both are related.


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Pszemol
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-15-2005 , 02:39 PM



"Peter Hill" <peter.usenet1 (AT) nospam (DOT) demon.co.uk> wrote

Quote:
Had a look though diagnostics for my 200SX (UK RS13 turbo),
Symptom and conditions for things that implicate the Neutral switch.
5 Hard to start - before warm up.
7 Hard to start - every time.
19 Engine stall - while idling (neutral switch remaining off)

Looks like it's used to set stable idle at no load using things like
alternator voltage instead of rpm.
Interesting what you found, I will try to observe the car behaviour,
but if I remember correctly I do not see any difference in rpms
when I shift from neutral to any gear holding clutch at floor level...
Also, I tried starting the car with shifter in 1st gear and in neutral:
both cases I had to press clutch to start, and there was no
difference in being harder to start. Something strange...

Maybe sentra and 200sx electronic control units dont work the same ?
Anybody here has sentra diagnostic book ?

BTW - I have Haynes manual and I tried to find this switch on
the elektrical wiring diagrams with no success. Ghost switch!!??


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Scott B
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-18-2005 , 09:12 PM



"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote in
news:1118856880.520619.9780 (AT) g44g2000cwa (DOT) googlegroups.com:

Quote:
So I guess it's only for fault diagnosis... used by the ECU. I would
refrain from disconnecting or you may trigger the check engine light
due to codes being set.

Professor
Check out FlashAlert at www.telstar-electronics.com


Pszemol wrote:
"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote in message
news:1118838480.507485.126690 (AT) g44g2000cwa (DOT) googlegroups.com...
"Neutral start" switches are only on automatic transmissions... I
guess you're talking about the switch that only allows starting the
vehicle when the clutch is depressed. This is a safety feature.

No, I have separate neutral switch in the lower left side of
transmission. Not far away from the backing light switch.

Safety feature - yes, I have clutch sensor too - dont think they both
are related.


Neutral switch is used to stop the cruise control from blowing your engine
if you slip the trans. out of gear under cruise - it only affects start on
automatics. Watch out for advice that starts with "I guess" - it could get
you a blown motor in this case. Also, you can hook up your remote starter
wire with no problems, as long as it is a good quality system. The
transmission harness/engine harness junction would be a good place to tap
in to it.

--

Scott B.

'89 240sx
'84 720 KK 4x4


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Scott B
 
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Default Re: nissan sentra 1994 - what is the "neutral switch" for ? - 06-19-2005 , 12:19 PM



Scott B <twofouroh (AT) NOSPAMgmail (DOT) com> wrote in
news:Xns9679D6B22EBD4scottNOSPAMfoginfoor (AT) 207 (DOT) 106.92.150:

Quote:
"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote in
news:1118856880.520619.9780 (AT) g44g2000cwa (DOT) googlegroups.com:

So I guess it's only for fault diagnosis... used by the ECU. I would
refrain from disconnecting or you may trigger the check engine light
due to codes being set.

Professor
Check out FlashAlert at www.telstar-electronics.com


Pszemol wrote:
"Professor" <briangriffey (AT) sbcglobal (DOT) net> wrote in message
news:1118838480.507485.126690 (AT) g44g2000cwa (DOT) googlegroups.com...
"Neutral start" switches are only on automatic transmissions... I
guess you're talking about the switch that only allows starting the
vehicle when the clutch is depressed. This is a safety feature.

No, I have separate neutral switch in the lower left side of
transmission. Not far away from the backing light switch.

Safety feature - yes, I have clutch sensor too - dont think they both
are related.



Neutral switch is used to stop the cruise control from blowing your
engine if you slip the trans. out of gear under cruise - it only affects
start on automatics. Watch out for advice that starts with "I guess" -
it could get you a blown motor in this case. Also, you can HOOK UP
YOUR REMOTE STARTER WIRE with no problems, as long as it is a good
quality system. The transmission harness/engine harness junction would
be a good place to tap in to it.

What I really meant was "hook up the remote starter w/out disconnecting the
neutral switch from the factory circuits it's currently feeding"


--
Scott B.

'89 240sx
'84 720 KK 4x4


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