Pennock's Fiero Forum
  Technical Discussion & Questions
  Problem with neutral safety switch 2.8

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Problem with neutral safety switch 2.8 by pgold
Started on: 02-27-2014 09:21 PM
Replies: 13 (499 views)
Last post by: mike-ohio on 03-10-2014 03:13 PM
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-27-2014 09:21 PM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
My neutral safety switch is not working so my fuel pump won't turn on upon initial start up. Does anyone know if this switch needs to be calibrated? Could the cable need adjusting ? Or may i have a faulty switch in the steering column? Not sure where to start. I currently have a jump wire in the switch plug just to be able to start the car. any ideas on how to get this switch working again would be appreciated.

------------------
paul gold

IP: Logged
PFF
System Bot
Bloozberry
Member
Posts: 7760
From:
Registered: Jan 2009


Feedback score: N/A
Leave feedback





Total ratings: 307
Rate this member

Report this Post02-27-2014 10:08 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
You didn't say if you had a manual or automatic transmission. It's important because the two switches are very different. If by chance it's a manual, you'll find this thread helpful: www.fiero.nl/forum/Forum2/HTML/123269.html
IP: Logged
phonedawgz
Member
Posts: 17011
From: Green Bay, WI USA
Registered: Dec 2009


Feedback score:    (23)
Leave feedback





Total ratings: 290
Rate this member

Report this Post02-28-2014 02:12 AM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
The neutral safety switch has nothing to do with the ECM's fuel pump prime operation.
IP: Logged
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-28-2014 07:28 AM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have a automatic transmission. If this switch does not control the auto prime of the fuel pump then what does? Does the switch in steering column activate the ECM to turn the pump on to prime fuel system.
IP: Logged
Bloozberry
Member
Posts: 7760
From:
Registered: Jan 2009


Feedback score: N/A
Leave feedback





Total ratings: 307
Rate this member

Report this Post02-28-2014 07:38 AM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
Two different circuits can turn on the fuel pump:

1. turning the ignition key to the "RUN" position, which then enables the ECM to ground the coil circuit in the fuel pump relay thereby turning on the pump; or

2. cranking the engine until 5 psi of oil pressure builds up which in turn closes a pressure switch that bypasses the fuel pump relay and turns on the fuel pump directly.

If you don't hear the fuel pump prime, but the car still starts after a few seconds of cranking, then those are the classical symptoms of a fuel pump relay that has malfunctioned. Here is the schematic:

IP: Logged
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post02-28-2014 04:59 PM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for the info i will check out the relay to see why the fuel pump won't come on. There may be a bad wire / plug or something.
IP: Logged
rogergarrison
Member
Posts: 49593
From: A Western Caribbean Island/ Columbus, Ohio
Registered: Apr 99


Feedback score: N/A
Leave feedback





Total ratings: 552
Rate this member

Report this Post02-28-2014 06:43 PM Click Here to See the Profile for rogergarrisonClick Here to Email rogergarrisonSend a Private Message to rogergarrisonEdit/Delete MessageReply w/QuoteDirect Link to This Post
The neutral safety on an automatic only keeps the starter from working in drive or reverse. Thats so it must be in park or neutral to start.
IP: Logged
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-01-2014 10:58 AM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
So does this switch also enable the backup lights to come on? Do these switches need to be calibrated or can a cable be adjusted to get the switch working again. The car won't start when in park. I thought the switch was bad so i replaced it with a brand new one witch did not work also. Right now i have the switch bypassed with a jump wire just to start the car.
IP: Logged
Bloozberry
Member
Posts: 7760
From:
Registered: Jan 2009


Feedback score: N/A
Leave feedback





Total ratings: 307
Rate this member

Report this Post03-01-2014 11:59 AM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yes, on the automatics the park/neutral switch also controls the backup lights (light green wire). I can't remember for certain if the Fiero's switch is adjustable, but from what I remember you should only need to loosen it and rotate it one way or the other until everything works, then tighten it up again. That's how it works on many other GM cars anyways.
IP: Logged
BrittB
Member
Posts: 453
From: Keizer, OR
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-01-2014 12:04 PM Click Here to See the Profile for BrittBSend a Private Message to BrittBEdit/Delete MessageReply w/QuoteDirect Link to This Post
I may have to replace my switch on my TH125 as well but it's because my reverse lights don't come on, can't seem to find one anywhere! The thing that pops into my mind is the oil pressure switch on the engine or possibly a relay but the fuel pump relay is also the one used for the cold start.

[This message has been edited by BrittB (edited 03-01-2014).]

IP: Logged
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-02-2014 06:36 PM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
Does the neutral safety switch get its power in the park mode from the ignition or from the computer. I can't start the car when in park. I had to disconnect the switch and put in a jump wire to bypass it just to start the car. Any ideas on how to fix this?

[This message has been edited by pgold (edited 03-02-2014).]

IP: Logged
PFF
System Bot
pgold
Member
Posts: 55
From: las vegas
Registered: Jan 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-03-2014 08:02 PM Click Here to See the Profile for pgoldClick Here to Email pgoldSend a Private Message to pgoldEdit/Delete MessageReply w/QuoteDirect Link to This Post
So i tested the wire from the computer and it was good. I found that the switch has to be installed with the transmission in the neutral position. once i did that everything is working again.
IP: Logged
PaulJK
Member
Posts: 6633
From: Los Angeles
Registered: Oct 2001


Feedback score:    (25)
Leave feedback





Total ratings: 237
Rate this member

Report this Post03-10-2014 01:09 AM Click Here to See the Profile for PaulJKSend a Private Message to PaulJKEdit/Delete MessageReply w/QuoteDirect Link to This Post
pgold, i sent u a PM a while ago if u are interested.
IP: Logged
mike-ohio
Member
Posts: 740
From: Marion Ohio
Registered: Feb 2007


Feedback score: (1)
Leave feedback

Rate this member

Report this Post03-10-2014 03:13 PM Click Here to See the Profile for mike-ohioClick Here to visit mike-ohio's HomePageClick Here to Email mike-ohioSend a Private Message to mike-ohioEdit/Delete MessageReply w/QuoteDirect Link to This Post
Neutral saftey switch for the automatic does control the starter circiut and backup lights. It does have to be adjusted when installing.

Look in Orgres cave under electriical then other.

When i replaced mine I could not get enogh clearance rotaing the switch to make the backup lights worked correctly. Had to drummel the adjustment hole on the switch to rotate it more and then everything worked.
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock