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.
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
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.
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:
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.
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.
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).]
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).]
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.
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.
